Oceanography

Samsun Nahar Maisha

Higher study

Thesis Title: An Assessment of Ocean Acidification and Seasonal Variability overthe South-Eastern Coast of Bangladesh

Overview: Ocean acidification poses a global threat to marine and coastal ecosystems, making it a top priority for scientific research, management, and policy to forecast its ecological impacts. The southeastern coastal waters of Cox’s Bazar, Bangladesh is an ideal region to investigate the variabilityofcarbonatesystemduetoitsenormousamountoffreshwaterdischarge,weakvertical mixing of water column, and seasonal variations of the coastal currents. This study aims to investigatethecurrentstatusandspatiotemporalpatternofacidificationinthesoutheasterncoast ofBangladesh.To monitortheconditionofacidification,itisnecessarytostudythedistribution of carbonate system (pH, total alkalinity) variables and ancillary parameters such as sea surface temperature, sea surface salinity, and inorganic nutrient concentrations (phosphate, silicate). Surface water samples were collected at 25 fixed stations from 5 transect areas along the coast fromJanuary2024toDecember2024.Theseasonalvariationsofthecarbonatesystemvariables were highly significant (p < 0.0001), while there were no significant differences among the coastalstationslocatedalongthetransectareas.inthestudyarea.Acidificationinthestudyarea was noticeably varied between the monsoon and the pre-monsoon periods due to monsoonal transitions.Theaverage surfacepH,totalalkalinity(TA),dissolvedinorganiccarbon(DIC)was lower 7.82, 2092.25 µmol/kg, and 1979.06 µmol/kg respectively in monsoon similar to the patternofseasurfacesalinitySSSandthehighervaluesoftheparametersforinstances,pH(8.1), TA(2010.825 µmol/kg), and DIC(2018.325 µmol/kg) were in pre-monsoon.Contrastingly, the pCO₂values showed higher concentration (373.65µatm -685.13µatm)in thewinterseason than the values of pCO2 in the pre-monsoon and in the post-monsoon. Also, the highest values of pCO2valuesparticularly in thenear coastal stations, and inverse relationship with salinity(<28) shifted as a strong source of carbon dioxide during the monsoon and the post-monsoon season, emphasizing the controls of low saline waters in the study area. However, no significant spatial variabilityisdetectedamongthecoastalstations.Thisbaselinestudyprovidesmuch-neededdata for evaluating the pH shifts that dictate marine ecosystem responses to acidification and long- term changes in the coastal Bay of Bengal of Bangladesh.

Tasnia Tahsin

Higher study

Thesis Title: Genetic Diversity and Phylogenetic Relationshipof Invasive Suckermouth Armored Catfish (Siluriformes:Loricariidae) in Bangladesh

Overview: The widespread introduction of suckermouth armored catfish (Pterygoplichthys spp.), particularly Pterygoplichthys disjunctivus, has posed ecological and economic challenges in many non-native regions, including Bangladesh. The objectives of this study were to assess the distribution and taxonomic composition of suckermouth armored catfish in the inland and coastal rivers of Bangladesh, identify the global origin of the studied species through molecular techniques, and evaluate genetic variation among the collected populations.Sample populations were collected from five major rivers: Buriganga, Turag, Karnaphuli, Jamuna, and Madhumati during October-November 2024 and were subjected to detailed morphological and meristic analysis, along with mitochondrial DNA-based genetic analysis targeting the 16S region. Morphological differentiation among the populations was evident based on key variables such as adipose fin spine length (ranging from 0.7 cm in BG1 to 3.0 cm in TS3), caudal peduncle depth (2.0-3.8 cm), and dorsal fin ray count (11-13 rays). Total body length varied from 20 cm (JM1) to 31 cm (BG1), and body weight ranged from 50 g (MM2) to 302 g (BG1). Molecular analysis confirmed that all samples aligned with P. disjunctivus, based on phylogenetic clustering with reference sequences in GenBank. The Neighbour-Joining tree revealed that the Bangladeshi populations formed a well-supported clade closely related to P. disjunctivus and showed sister-group relationships with Hypostomusfrancisci, suggesting possible introgression or shared ancestry. Sequence divergence was observed even within populations, indicating the presence of multiple haplotypes. Genetic diversity metrics computed using DnaSP and Arlequin software revealed varying degrees of haplotype and nucleotide diversity across river systems.Karnaphuli showes no genetic diversity at all (0.0000 ± 0.0000) and Turag, Buriganga and Jamuna showed genetic diversity (1.0000 ± 0.5000) within population.Analysis of Molecular Variance (AMOVA) indicated For Fixation index (FST)“-0.33333”and P-value = 0.99099±0.0030, 33.33% of the genetic variation is due to differences among populations and 50% due to differences within population. Which indicates, most genetic variation is found within populations, not between them.This study represents the first integrative assessment combining morphology and molecular tools to confirm the species status and genetic differentiation of invasive P. disjunctivus in Bangladesh. The findings reveal significant inter-population diversity and potential adaptive variation, underscoring the urgent need for ecological monitoring, biosecurity measures, and public awareness to mitigate the ecological impacts of these non-native catfishes on native biodiversity and fisheries in Bangladesh.

Tanvir Hyder Shishir

Higher study

Thesis Title: Density and distribution of Marine debris throughout the lower Meghna estuary of Bangladesh

Overview: Marine debris, defined as any solid waste material that enters or originates from the marine environment, has become a global environmental challenge. Its presence poses significant threats to marine ecosystems, wildlife, human health, and coastal communities. This study aims to quantify marine debris in the lower part of Meghna estuary using specific fishing net. A total 186 kg of litter was estimated using nine nets from three locations using 3.5 hours of hauling time. Most of debris was organic in nature (85.55%) while rest (14.45%) of the wastes was non-organic. Generally, organic debris was lager in size (4 to 12 cm) and comprising 50 items in all nine nets. These are mainly, timbers and burks. On the other hands, non-organic debris was smaller in size (< 4 cm). These are comprised with plastics (n=260), metals (n=44), clothes (n=25), glasses (n=14), battery (n=11) and rubbers (n=10). Plastics and metals were concentrated in upper zones of the study area while battery and engine items were mostly found in lower zone. The study was conducted during dry (low flow) season. High flow season quantification will be done in times to know the status of marine debris throughout the year therefore a comprehensive understanding could be perform for debris screening for batter management of Meghna estuary ecosystem.

Zahid Hasan

Pvt. Employed

Thesis Title: Estimation of Shoreline Changes of Urirchar and Bhasan Char Islands using GIS-DSAS Technique

Overview: The coastal zones of Bangladesh, particularly the Meghna Estuary, are highly dynamic due to the convergence of the Ganges, Brahmaputra, and Meghna (GBM) river systems, which discharge massive amounts of sediment into the Bay of Bengal. This study focuses on the shoreline changes of Urirchar and Bhasan Char Islands in the Meghna Estuary over a 25-year period (2000-2025) using remote sensing and Geographic Information Systems (GIS) techniques. Landsat satellite imagery was employed to extract shorelines, and the Digital Shoreline Analysis System (DSAS) was used to quantify erosion and accretion rates. The study utilized the Tasseled Cap Transformation Wetness Index (TCWI) and Color Infrared Composite (CIR) imagery for accurate shoreline extraction, validated with high-resolution Google Earth imagery.The results reveal significant spatial and temporal variations in shoreline dynamics. Urirchar experienced a net land gain of 36.39 km² over the study period, with dominant accretion in the early years (2000-2015) followed by increased erosion from 2015 onwards. Bhasan Char exhibited highly variable erosion and accretion patterns, with a net land gain of 71.68 km², but also significant erosion phases, particularly between 2015 and 2020. The DSAS analysis highlighted critical erosion hotspots and areas of accretion, providing insights into the geomorphological processes driving these changes.This research underscores the importance of continuous monitoring and sustainable coastal management strategies to mitigate erosion risks and enhance the resilience of these vulnerable islands. The findings contribute to a better understanding of shoreline dynamics in the Meghna Estuary and offer valuable information for coastal zone management, disaster risk reduction, and policy-making in Bangladesh.

Habiba Akter

Self employed

Thesis Title: Impact of Arsenic Contamination on Coastal Community of Subarnachar, Noakhali – A Perception Based studies

Overview: With millions of people exposed, Bangladesh's groundwater pollution by arsenic is the worst population poisoning in history. This essay outlines the events leading up to the present status of arsenic contamination, health impact, socio-economic impact, responses from GO and NGOs, solution and mitigation to reduce the impact of contamination of drinking water and suggests remediation measures in Subarnachar upazila, Noakhali. The data was collected from 100 respondents based on questionnaire survey. The sources of drinking water were from deep and shallow tub-well. Among the respondents of the study area, 63% respondents used deep tub-well and the rest 37% used shallow tub-well. The results showed that the percentage of arsenic contamination in Char amanullah comparatively high in both shallow tub-well (31.2%) and deep well (8.1%) than other area. About 77% tub-wells were tested arsenic test and 23% were not tested. Of 77% tub-wells, 49% were safe, and the rest 51% were contaminated. 39% of the respondents claimed that they had faced physical problem and among them 33.3% were tested Arsenicosis and 66.6% were not tested. Most of the respondents had been facing various long- term symptoms named chronic symptoms; 41% of the respondents had faced skin lesion, 18% stomach problem, 15% had hair damage, and 8% had eye irritation. Among 39 of the respondents 67% of the respondents sought medical help and found help from community clinic but not sufficient and the rest 33% sought not medical help. The socio-economic impacts on the study area were increased medical cost (54%), decreased income (26%), and loss of employment (11%) were common of the respondents. Of 74% of the respondents 50% claimed to need safe drinking water supply, 27% were medical treatment and the rest 22.9% were awareness program as types of supports from GO and NGOs. “Use arsenic free tub-well” were suggested by the majority of the respondents as the mitigation process of arsenic contamination. Though Char Amanullah and Char klark locations are the most contaminated area, identification of arsenic contaminated tub-well and availability of alternative sources of drinking water must be ensured to the whole study area. There should be taken effective measures such as using appropriate technologies, sufficient funding, raising community awareness by the government to ensure Safe and arsenic free drinking water for the affected people.

Imtiaz Hossain

Pvt. Employed

Thesis Title: The Effects of Microplastics Exposure in Tilapia – ASystematicReview

Overview: Nile tilapia (Oreochromis niloticus) ranked fourth among the most cultured aquaculture species. Due to its short generation time, high tolerance to variable water quality and diseases and ability to grow in diverse farming systems, it is responsible for the significant increase in global tilapia production from freshwater aquaculture. Some studies have revealed that pelagic fish intake more MPs than demersal fish because they feed in the open water column, where microplastics are more abundant. Tilapia fish dominate the pelagic zone, and the presence of MPs was reported in the GIT of farmed-raised tilapia. As Tilapia is now the most produced and consumed fish, it may threaten fish health and human health. In the 28 studied literature, the prominent shape was Small (<300 μm) accounted for 61%, dominant colour was Blue (21%), shape Sphirical (22%), dominant polymer type was Polyethelene (PE) (20%). Tilapia fish health is most impacted by Polystyrene (PS) polymer type. Several studies reported Potential anemia or impaired oxygen transport due to Polystyrene (PS) polymer ingestions in fish body. Significant oxidative stress, with increased levels of SOD, GPX, and MDA; Upregulation of inflammatory cytokines (IL-1β, IL-8, TNF-α, IFN-γ), indicating an immune response; Increased Cytochrome P450 (CYP450) expression, suggesting detoxification activity. According to studied literatures, human health is the most impacted by Polystyrene (PS) polymers. Several studies reported that it can release styrene, which is linked to neurological damage and cancer risk, polystyrene breakdown products may include styrene oligomers, which are known to be potentially toxic, Styrene oligomers from PS degradation may act as endocrine disruptors or neurotoxins.

MonirHossain

Self employed

Thesis Title: An Investigation of the Sources and Dispersal of Plastic Waste along Buriganga Riverbank of Bangladesh

Overview: The Plastics are one of the common versatile materials in this modern era. Therefore, plastic pollution is one of the pressing issues in environment that ultimately contribute to coastal pollution. Plastic pollution near Buriganga river is of high concern because of its persistence dumping near the bank of the river and its potential impact on ecosystems. The present study aimed to address the state of plastics pollution in the Buriganga River system, Bangladesh. Here we present five sampling sites that allocated in different part of Buriganga river banks, and plastic debris was collected from each site. Active sampling from each site was in quadrat of 1 m2 area in located shore covered by plastic debris. All the plastic debris was collected from each site and then, plastic debris were categorized and weighed to measure their abundance. A total 1648.98g plastic debris were collected from those five sites, where mostly 454.57g was individually counted from site-1(Buriganga bank), According to weight, load of plastic debris was Buriganga Bank>Zinzira>Bosila bridge> Kholamaraghat> Gudaraghat respectively. The results showed that, the quantity of plastic wastes has increased due to industrial and human activity near Buriganga river. This study has also demonstrated the ecological health by PLI and CCI index, where ranked the above sites as highly polluted. This plastic contamination impact on fish biodiversity, fishing activity (clogging in net), and livelihood of local fisherman are affected. Thus, government intervention on illegal dumping of plastic waste, strict law implementation and awareness building among people become key concerns to save the Buriganga river from plastic pollution.

Ananya Bhuiya

Higher study in Denmark

Thesis Title: Spatiotemporal distribution, ecological risk assessment, and human health implications of currently used pesticide (CUP) residues in the surface water of Litle Feni River

Overview: Monitoring the persistent organic micro-pollutants (e.g., pesticides) in the river water is urgently needed due to their negative environmental and human health consequences. The present study to investigate the occurrence of multiclass pesticide residue in the surface water of Feni River, Bangladesh, using an optimized salting-out assisted liquid-liquid microextraction (SALLME) coupled with liquid chromatography-mass spectrometry (LC-MS). For this purpose, 21 surface water samples were collected throughout the study area during July, 2023 to understand the spatial distribution of pesticide residues. The optimized analytical method resulted in satisfactory recovery percentages for the target analytes according to the SANTE/11312/2021 guidelines. The residue concentration for individual pesticide ranged from below detection level (BDL) to up to 15.5 ppb. The most frequently detected pesticide was Dimethoate (DMT,an organophosphorus insecticide), followed by Chlorantraniliprole (CLP), Pymetrozine(PYM), and Carbofuran (CAR). On the other hand, Azoxystrobin (AZ) and Buprofezin (BUP) were absent in the collected samples. Furthermore, ecological risks assessment based on the general-case scenario (RQm) and worst-case scenario (RQex) indicated high (RQ > 1) risk to aquatic organisms, e.g., algae, zooplankton, and fish from the occurrence of PYM and CLP residue in river water. Overall, the findings act as baseline study of pesticide residue occurrence in the study area and infers valuable insights for relevant authorities to regulate pesticide pollution in coastal rivers.

Jerin Sayema

Self employed

Thesis Title: Assessment of Heavy Metal Pollution in Surface Water of Little Feni River: Implications for Environmental and Human Health Risk Management

Overview: The primary goal of the study was to identify the distribution and level of contamination due to metals and other elements in the surface water of the Little Feni River. Twenty-one surface water samples were collected to determine the elemental composition and associated hazards to human health. The concentrations of fifteen elements were found in the descending order ofSr> B > Fe > Al > Ti >Zr>Mn> Ba >Sn> As > Cr > Zn > Se > Cu > Ni. Water Quality Index demonstrated. Heavy Metal Evaluaton index (HEI), Comprehensive Pollution Index (CPI), and Nemerrow Pollution Index (NPI) revealed that the river's surface water was low to moderately polluted due to the elevated As, Cr, Fe, and Mn content. Furthermore, the potential ecological risk (PER)for the study area's surface water falls into the low ecological risk category.According to HQ and HI, the human health hazards were found relatively lowfor all of the heavy metals except Cr for which HQ vlues were found >01indicating ahigherhealth risks for adults.Correlation analysis was used to identify the origins of the heavy metals in the study area. Although surface water contamination waslow to moderate in the study area, authorities should implement adequate management and monitoring strategies to maintain the health of aquatic ecosystems.

Ayesha Akter

British Council, ComilllaCentre

Thesis Title: People Awareness towards Coastal Plastic Pollution of Bangladesh – A perception Based Study

Overview: Plastic pollution is a prominent form of environmental problem that has a substantial negative impact on marine ecosystems, especially along coastlines. Due to rising industrialization, urbanization, and insufficient waste management techniques, coastal plastic pollution is becoming a worsening issue in Bangladesh. A perception-based approach was adopted to gather qualitative and quantitative data from a diverse sample of respondents representing various demographic and socio-economic backgrounds. The results show that the public in Cox’s Bazar and Noakhali Coast considers the use of plastics is a significant environmental and health problem. The majority of respondents have stated that they were interested in shifting to eco-friendly products. The procedure of public consultation on the actualization of this problem, as well as the national law guidelines, has also been performed. However, the results of this survey revealed that the participants were aware of the issue of marine plastic contamination. They use any type of plastic material unconditionally. They have no knowledge about biodegradable products or their advantages. Despite this, they have shown a good attitude regarding paying and working to limit plastic trash in coastal area. This study also examined the local publics and tourists' knowledge and levels of awareness, comprehension of the issue, perceived consequences, and current efforts related to marine plastic pollution control in Cox's Bazar and Noakhali Coast. In this case, human use and management of daily plastic-based products can play a significant role in controlling this environmental issue. Understanding public perceptions of plastic pollution may be a useful resource for engaging society in ways to decrease its environmental release.

Jannat

Higher study in Australia

Thesis Title: Assessment of Diversity and Guild Structures of the Estuarine Fish Assemblages in the Middle Segment of Meghna River Estuary, Laxmipur, Bangladesh

Overview: a. To assess the fisheries diversity in the middle segment of Meghna river estuary. b. To identify different categories of fish guilds on the basis of habitat preferences, feeding behavior, and IUCN red list of threatened and vulnerable fish species. c. To investigate temporal variability of fish assemblages in relation to environmental parameters.

Jannatul Ferdaous

Higher study

Thesis Title: Assessment of Surface and Groundwater Salinity Status in Musapur, Noakhali

Overview: The appropriateness of water resources for domestic, industrial, and agricultural purposes is largely dependent on their quality, especially the salinity levels in surface and groundwater. The purpose of this study is to evaluate the salinity concentration and spatial variation in surface and groundwater. Key water parameters, such as pH, TDS, and Electrical Conductivity (EC), were measured in water samples that were taken from 98 sampling points around the study area. Spatial mapping and classification of water suitability were also carried out to help the region's sustainable water management methods. About 66% sample of groundwater are permissible for drinking and irrigation suitability as per as salinity concern. Around 17% of groundwater are Doubtful and 17% of sample are unsuitable for drinking purpose. on the hand in irrigation purpose,31% are Doubtful and 2% are unsuitable. On the other hand, 41% samples of surface water are good and 33% are permissible for drinking and irrigation purpose. About 24% sample of surface water are Doubtful and 2% are unsuitable. About 66% of the total sample of groundwater shows <1000 mg/L of TDS value which indicates fresh/good quality for drinking and irrigation purposes. Around 2% sample are permissible,16% are doubtful and 16% are unsuitable for same purpose. In case of surface water, 41% of the sampling locations showed fresh or good quality for drinking and irrigation purpose. Rest of the sample are 29% permissible, 20% are doubtful and 10% are unsuitable. Significant differences in salinity concentrations are shown by the data. Salinity levels were found above national and World Health Organization (WHO) acceptable limits for drinking and irrigation in several locations. The findings give policymakers, local governments, and stakeholders with useful insights on how to prevent salt impacts and encourage sustainable water resource management in Bangladesh's coastal and low-lying areas.

Monika Dhar

Higher study

Thesis Title: Assessment of Fish Diversity along with Ecological Variables in Bakkhali River Estuary, Bangladesh

Overview: Estuaries are the most productive aquatic ecosystem and ecological variables determine the health of an aquatic ecosystem.The anthropogenic stressors have the potential to decrease the quality of the estuarine ecosystem and hence affect the biodiversity negatively. This study assessed the water quality and fish biodiversity of the Bakkhali River Estuary, Bangladesh, to understand the ecological dynamics. Field sampling was conducted in July, 2025 at three sites.Water quality parameters were measured alongside fish catch data. There was significant spatial variability, found in salinity (0.27 to 26.17 ppt) and ORP (8.43 to 15.57 RmV) that were indicative of tidal mixing and anthropogenic inputs.A total of 30 species under 21 families were identified throughout the study period. The most abundance species includedEscualosa thoracata, Scylla serrata, and Mugil cephalus. Biodiversity indices indicated the highest richness (Margalef d=3.68), diversity (Shannon H′ = 2.59), and evenness (Pielou’s J′ = 0.79) at the mid-estuary site, while the upstream site showed lower diversity (H′ = 2.17) and higher dominance (D = 0.17). The species biodiversity indices (H′, d,J′)showed a strong negative correlation with temperature. In contrast, a strong positive correlation with salinity. The fish assemblage was predominantly composed of carnivorous taxa (50%) and omnivorous taxa (43.3%), with demersal species accounting for the largest share (53%) of the community. Analysis revealed significant differences (p < 0.05) in salinity, ORP, and species diversity among sites, while hierarchical cluster analysis grouped the mid- and lower-estuary sites together, reflecting their similar ecological conditions. According to IUCN conservation status, two species were categorized as data deficiency and 21 species were classified as Least Concern. The findings emphasize the need for regular water quality monitoring and integrated management to protect fish biodiversity in the Bakkhali River Estuary.

Sumaia Binte Alam

Higher study

Thesis Title: Assessment of Soil Organic Carbon and Nitrogen Content in a Mangrove Area of Salimpur Coast, Chittagong, Bangladesh

Overview: 1. To estimate the organic carbon and total nitrogen content of the mangrove soil of Salimpur coast. 2. To assess the spatial and vertical distribution of organic carbon and total nitrogen of the study area.

Md. Gofran

Higher study

Thesis Title: Assessment of Fish Diversity along with Ecological Variables in Karnaphuli River, Bangladesh

Overview: 1. To assess the ecological variables of the Bakkali River estuary 2. To estimate the fisheries biodiversity status of the study area. 3. To evaluate the variation and ecological dynamics on the biodiversity status.

Tasnime Jannat Rifa

Higher study

Thesis Title: Presence of Microplastics in Suckermouth catfish (Pterigoplichthysdisjunctivus) collected from Buriganga and Karnaphul River

Overview: Microplastic pollution has been an increasing issue for global aquatic ecosystems and food safety.This study examines at the presence and characteristics of microplastics (MPs) in the intestines of sucker mouth catfish (Pterygoplichthysdisjunctivus) that were taken in the Karnaphuli and Buriganga rivers in Bangladesh. A total of 10 individuals of sucker mouth catfish, with an equal number sourced from each river, were examined. There were 51 microplastic particles in all, and the gastrointestinal tracts weighted between 5.42 g and 5.90 g. There are more MPs in the Buriganga River samples (6.0 MPs/fish) than in the Karnaphuli River samples (4.2 MPs/fish), which means that the Buriganga River is more loaded with MPs. Most of the MPs were very small (125–1500 µm) and looked like fibers. Pieces and lines were the second most common shape. Red was the most common color, followed by black and transparent particles in smaller proportions. The study reminds us that protecting our rivers is not only important for the animals that live in them, but also for the food we consume and the health of the people who live near them.

Sweety Bhowmik

Higher study

Thesis Title: Preparation of Bioplastic-sheet from seaweed (Ulva lactuca) collected from Cox’s Bazar, Bangladesh

Overview: i. Formulation of bio field from seaweed (Ulva lactuca) ii. To prepare a bioplastic field from seaweed (Ulva lactuca)

Johora Akter Ritu

Higher study

Thesis Title: Assessment of Hilsa Fishery Resources of Bangladesh Over Twenty Years - A Systematic Review

Overview: River shad, or Hilsa (Tenualosa ilisha), is a species of anadromous fish that is found across the North Indian Ocean, primarily in the Bay of Bengal (BoB).Hilsa is one of the most significant commercial fish in the Indo-Pacific area which is a member of the Alosinae subfamily of the Clupeidae family.Bangladesh's national fish, Hilsa, accounts for 10% of the nation's overall fish production. Food and feeding habits of Hilsa in its various stages of life cycle, population dynamics and production of Hilsa have been studied by many scientists time to time in different water systems. However the scattered studies and results make it challenging for assessment. As a result the goal of this study was to compile pertinent scientific materials that would serve as the basis for further investigations. Aims were chosen to understand over two decadal status of production of hiilsa fishery, food and feeding habitats and the population dynamic parameters of Hilsa Shad. The study was conducted successfully by completing five analytical procedures: SLR (Systematic Literture Review) planning, literature search, screening and data extraction , data analysis and finally reporting and documentation. The most often referenced phytoplankton consumption in almost all literatures were Chlorophyceae and Bacillariophyceae and zooplankton consumption were rotifera , cladocera and copepoda. Over the last two decades the Hilsa Production was increased2.5 times(2.2 lakh MT in 2001-02 to 5.6 lakh MT in 2021-22). The overall production rate from marine habitat was higher than the riverine and Sundaraban catch,covering almost 63% share. The highest total length (TL) was recorded 57.7 cm, the asymptotic growth (L∞) was found 60 cm over two decades and the highest growth constant was identified 0.99/yr. Different mortality rates including total mortality (Z), natural mortality (M) and fishing moratality (F) recorded highest in number respectively 4.9/yr, 1.5/yr and 3.45/yr over last two decades.Hilsa was identified as an overexploited species and in order to ensure the sustainable manegement, harvesting of juvenile immature fishes and brood fishes should be prevented through a variety of management including ecological and socioeconomic adaptation.

Rakibul Hasan

Higher study in UK

Thesis Title: Assessment the water management practices of a coastal hatchery in Cox’s Bazar, Bangladesh

Overview: Good water quality is crucial for achieving optimal production results in a hatchery, especially in those operating with higher intensity. This study was conducted from 10 December 2023 to 31 December 2023 at Cox's Bazar, Bangladesh to know the water quality of a coastalhatchery. To complete the water management assessment of the hatchery, a minimum of seven days was required. Therefore, each types of samples were from source water, during operation, and discharge. Each sample type was collected three times during the study period.The physico-chemical parameters of water were evaluated at a shrimp hatchery to understand the present status of water quality.Water temperature, salinity, dissolved oxygen and pH were more or less similar both in sea water and UV treated water during operation but were highly variable in the water collected from discharge. This research indicates that current hatchery operations along the coast of Cox’s Bazar are sustainable, largely due to the quality of the nearby coastal waters

Sayema Sultana

Higher study

Thesis Title: Bioaccumulation of Heavy Metal in Crustaceans and Fishes from the lower Meghna River Estuary with Human Health Risk Assessment

Overview: Heavy metals are an important group of chemical and food in the major route for entry into the system. This study was undertaken to determinethe heavy metal in crustaceans and fishes from the lower Meghna estuary and evaluate potential human health risks. The concentration of heavy metals, i.e. As, B, Ba, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sr, Ti, Zn and Zr were measured from editable tissues of two crustacean species (i.e.Scylla serrata,Penaus monodon), nine fish species (i.e.Lates calcarifer, Lepturacantus savala, Rhinomugil corsula, Mystus bleekeri, Mugil cephalus, Sillago domina, Apocryptes bato, Polynemus paradiseus, Coilia dossumieri) and water samples. Those were detected using The Agilent 5800 ICP-OES technique. The analysis has been performed in the Chemistry division lab, Bangladesh Atomic Energy Commission, Dhaka, from November to May, 2024. To assess of heavy metal pollution in aquatic organism, bioaccumulation factor (BAF) and metal pollution index (MPI) were calculated. On the other hand, for assessing the health risk effect, estimated daily intake (EDI), target hazard quotient (THQ) and carcinogenic risk (CR) were also conducted. From this study, zinc (Zn), iron (Fe) and cupper (Cu) were found high amount in crustacean sample Scylla serrata. On the other hand, lowamount of Ni and Hg among were found in the studied fish species. Heavy metal concentration in the crustacean & fish samples were found in sequence of Zn> Fe> Cu> Sr> Ti> B> Zr> As> Ba> Mn> Pb> Se> Cr> Ni> Hg respectively. In this study the level of bioaccumulation (BAF) was highest for zinc (Zn). Here MPI value for crustacean is higher than fish and water. Thevalues of EDI for the crustacean and fish species were below than the recommended value.Children has high health risk associated with the intake of studied heavy metals through the consumption of examined species. The values of THQ for both adult and children consumers were less than one which indicates consumers would not experience the non-carcinogenic health risk. Here, HI value is higher for children than adult, which also indicates high non carcinogenic risk of children. CR values of As and Cr for children is higher than adult indicating lower probability of CR risk and Pb’s CR risk is negligible for both. In this study, there had not any health risks to humans associated with consuming the species under investigation at the current consumption rate.

Fariya Akter Lisa

Higher study

Thesis Title: Bioaccumulation of Heavy Metal in Fishes and Crustaceans from the Karnaphuli River Estuary with Human Health Risk Assessment

Overview: Heavy metals are an essential group of chemicals, and food is the primary route for entry into the system. The study aimed to estimate heavy metal accumulation in crustaceans and fishes from the Karaphuli River estuary and assess potential human health risks of metal concentration of crustaceans and fish consumption. Heavy metals were measured from edible tissues of studied species,i.e.Scylla serrata,Penaus monodon, Lates calcarifer, Lepturacantus savala, Rhinomugil corsula, Mystus bleekeri, Mugil cephalus, Sillago domina, Apocryptes bato, Polynemus paradiseus, Coilia dossumieri and water samples. Heavy metals,i.e.As, B, Ba, Cr, Cu, Fe, Hg, Mn, Ni, Pb, Se, Sr, Ti, Zn and Zr were detected using the Agilent 5800 ICP-OES technique. Bioaccumulation Factor (BAF) and Metal Pollution Index (MPI) were calculated to assess heavy metal pollution in aquatic organisms. Also, to evaluate the effects of human health risk, the Estimated Daily Intake (EDI), Target Hazard Index (THQ), Health Index (HI), and Carcinogenic Risk (CR) were conducted.The analyses ofheavy metals were performed in the Chemistry division lab, Bangladesh Atomic Energy Commission, Dhaka, from November to May 2024.Zinc (Zn) was found in high amount in crustacean sample Scylla serrata (145.19 μg/g), and Iron (Fe) was found in second high amount in fish sample Mystus bleekeri (51.88 μg/g). On the other hand, low amounts of Ni and Crwere found in the studied samples. Heavy metal concentrations in the crustacean & fish samples were found in the sequence of Zn > Fe > Sr > Cu > Ti > As > Zr > Pb > B > Mn > Se > Ba > Hg > Ni > Cr, respectively. BAF value is higher for crustacean species than fish species, and the level of bioaccumulation is highest for zinc (Zn). MPI value of crustaceans is greater than that of fish species and water.EDI values of the examined samples were below that of the tolerable level. Children have high health risks associated with the intake of studied metal through the consumption of studied species. There was less than one THQ for adult and child consumers, indicating consumers would not experience the non-carcinogenic health effects. Comparing the HI values for adults and children, HI is high for children, indicating high non-carcinogenic risk. CR values of As and Cr for adults and children were found to havealower probability of CR risk,and Pb’s CR values were negligible for both.This study suggests that ingesting the studied species has no probable human health risk under the current consumption rate.

Rifat Ahmed

Higher study

Thesis Title: length weight relationships (LWRs) of Arius maculates from Char Alexander, Laxmipur

Overview: • To estimate the length weight relationships (LWRs) of Arius maculates from Char Alexander, Laxmipur • To estimate the condition factor (Kn) for the Arius maculatus from Char Alexander • To evaluate the growth and body shape condition using LWRs and Kn

Chitannaya Chakma

Higher study

Thesis Title: length-weight relationships and condition factor for Harpadonnehereuscaught from Char Alexender, Lakshmipur

Overview: The present study was carried out to estimate the length-weight relationships and condition factor for Harpadonnehereuscaught from Char Alexender, Lakshmipur, Bangladesh. A total of 206 speciesHarpadonnehereussamples were collected in the month of January, 2024. The mean value of total length was 16.25±2.50 cm and the mean value of total body weight was 48.97 ± 2.27 g. The regression coefficient 'b' obtained from LWRS were recorded as3.24, with significantly positive correlation for Harpadonnehereus. LWRS indicated positive allometric growth for the species. The value of correlation coefficient, r2 = 0.943 that indicates good prediction and small data dispersion. Individual fish species conditions determined based on the analysis of length-weight data reflected that the heavier fish at a given length is in better condition. It also indicates the conducive environmental condition.

Ishrat Jahan

Higher study

Thesis Title: Sediment Characteristics along with Benthic Community Structure in the Erosion Prone area of lower Meghna Estuary

Overview: Estuarine ecosystem is unique in its physic-chemical, morphological dynamics and biodiversity. The estuarine ecosystem is one of the most productive ecosystems which is isolated from the marine and freshwater ecosystems. The present study was performed to deal with the sediment characteristics and the community structure of benthic organisms in a erosion prone segment of left bank of lower Meghna river estuary. The sediment texture was analyzed with the use of a soil texture triangle plot. Overall sediment texture was found as loamy character. The sediment characteristics of station 01 found silty loamy, where station02 and stations 01 being loamy and sandy clay loamy respectively. All the physic-chemical parameters were found optimum except total suspended solids (TSS) which is unusual higher. The diversity of benthic organisms of this eroding sediment was found comparatively poor (H’=1.48). The study revealed that the sub-surface deposit feeders like Polychaeta and surface deposit feeder gastropod are the most dominating groups followed by minor groups like bivalves, decapod, mysids, and fish larvae. The most diversified and abundant station was station-02 and comparatively least was station-01. This indicates that at the finer sediment with favorable physiochemical parameters the macrobenthos density and abundance are high and comparatively lower diversity indicates the unfavorable environment. Overall the Tankir ghat’s ecosystem quality is not favorable for the benthic community diversity.

Nusrat Jahan Eshita

Higher study

Thesis Title: Assessment of groundwater salinity variation along a north-south transect from Sonaimuri to Chairman Ghat, Noakhali, Bangladesh

Overview: Groundwater serves as a significant source of drinking water for people around the world, particularly in rural areas where other water sources may be limited or not available. Groundwater quality refers to the chemical, physical, and biological qualities of groundwater that define its appropriateness. Salinity can occur naturally due to geological processes, but human activities such as agricultural practices, industrial activities, and wastewater disposal can also contribute to increased salt levels in groundwater. It's getting a significant problem in many regions around the world, especially in coastal areas where seawater can intrude into freshwater aquifers which can have negative impacts on human health. High levels of salinity in groundwater can result from natural processes, such as the dissolution of salts from rocks and minerals, or human activities, such as agricultural practices, industrial activities, and wastewater disposal. For evaluating groundwater suitability 97 samples were collected for the study from a transect line along Chairmanghat to Sonaimuri in the Noakhali region. The main purpose of the study is to determine salinity variation from the TDS and EC values of collected groundwater. The drinking water was categorized into different quality parameters depending on TDS and EC values. The results revealed that 57% of the sample is fresh and 33% of samples are permissible for drinking purposes. 14% of the collected samples were unsuitable to use although local people use this for various purposes that may lead to an effect on human health. Moreover, significant steps should be taken to aware people in that region.

Zahid Hasan

Higher study

Thesis Title: Variability of Chlorophyll-a and Sea Surface Temperature, and Their Relationship with Bathymetry over the Bay of Bengal

Overview: Sea surface temperature (SST) is a fundamental parameter for quantitative studies of the Earth, atmosphere, and ocean. SST plays an important role on phytoplankton growth hence the chlorophyll-a (Chl-a) and is closely related to water stratification. Chl-a is the main pigment which phytoplankton uses in photosynthesis to convert nutrients and carbon dioxide, which are dissolved in sea water. The present study was done based on satellite data (MODIS Aqua Product) from 2002-2022. This study examines trends in the link between SST and chlorophyll-a, as well as their trends and association over the bathymetry of the Bay of Bengal. The mean SST of the dataset ranged from 26.46 to 31.17°C, with lowest temperatures between 17.99 and 28.3°C and maximum temperatures between 30.17 and 39.97°C. On the other hand, the mean Chl-a concentration ranged from 0.15 to 0.75 mg/m3, with a minimum range of 0.02 to 0.5 mg/m3 and a maximum range of 6.69 to 36.03 mg/m3. The concentration of Chl-a was found to be higher near the northern part of the Bay of Bengal. SST has exhibited a progressively rising tendency whilst Chl-a in the Bay of Bengal declined. We found a maximum correlation between chl-a and SST found (-0.7370) in July of Chl-a over bathymetry and a negative correlation (-0.4116) between the SST and Chl-a.

Mahmuda Akter

Thesis Title: A Review on Understanding the Effects of Ocean Acidification on Coral Reef

Overview: The biological diversity of coral reef ecosystems is among the highest on the world. Coral reefs are important for biodiversity and also supply resources and food for approximately 500 million people worldwide. Despite their significance, coral reefs are rapidly disappearing (1–2% annually) due to a variety of regional and global factors. By slowing the calcification rate of the framework builders, ocean acidification poses a serious threat to coral reefs. Moreover, corals' symbiotic interaction with dinoflagellates and the productivity of this association are also expected to be impacted by acidification. To understanding the effect of ocean acidification on coral reef ecosystem , several experiment have been conducted across the world . Here we reviewed the effect of natural and anthropogenic ocean acidification on coral reef ecosystem. Coral reefs are found in shallow, tropical areas all over the world, with the Indo-Pacific region, the Caribbean Sea, and the western Atlantic Ocean having the highest reef densities. We found that ocean acidification have great impact on different coral species through changing their physiology, reproductive phenology , growth, development, calcification, survival and abundance. However, we also found that not all species are severely affected by ocean acidification. There are some species who have the ability to adapt to the effects of ocean acidification. We also showed the naturally acidified region where hard and soft coral cover have changed through the increasing of pCO2.

Habiba Akter

Higher study

Thesis Title: A systematic Literature Review on Heavy metal Contamination in Coastal Water of Bangladesh

Overview: The coastal zone of Bangladesh, with a population density of 1278 people per square kilometer, is under serious threat due to heavy metal pollution.The heavy metal poisoning of water in Bangladesh's coastal region has been the subject of several research to far, but the information that is currently accessible is fragmented.In this study, previous findings on the contamination levels, distributions, risks, and sources of heavy metals in water summarized to present the overall status of heavy metal pollution along coastal regions. In this review around 12 HMs(Fe,Cu,Zn Cr,Pb,Hg,,Cd,Ni,Co,Mn,As,Al, are discussed found in coastal water in Bangladesh. In this review Fe and Pb were found to be more than permitted levels in most of the coastal area. Karnafuli River estuary were found to be the most contaminated area .Thekarnafuli river and the Halda river were identified the most polluted than others coastal area due to having their excessive value than the reference value. The most widely utilized heavy metal analytical methods mentioned in the reviewed literature were, AAS, EXDRF, and Organic Elemental Analyzer(Macro Coder JM1000CN, J-Science Lab Co., Ltd., Kyoto, Japan)

Ashish Chandra Saha

Self employed

Thesis Title: Abundance, composition, diversity and distribution of benthic infauna around Hatiya Island

Overview: This study was conducted in the HatiyaUpazilla during the period of April to December, 2016 to know the abundance, composition, diversity and distribution of benthic infauna. The benthic infauna were collected from four stations along the river by using an Ekman Dredge having a mouth opening of 0.02m2 covering three seasons (pre-monsoon, monsoon and post-monsoon). A total of 13 families under 4 major groups/taxa were identified from all stations of the study areas. The density of benthic infauna was highest among the stations during the post-monsoon period because of the changes in the water quality variables as well as the different seasons too. The highest number of benthic infauna was identified 1020 ind./m2 at station S2 during monsoon period while the lowest number was 191 ind./m2 at station S1 during pre-monsoon period. Lumbreneridae and Nereididae dominated in all stations during the pre-monsoon, monsoon and post-monsoon of the present study. Nephtyidae, Glyceride, and Oediceratoidae were also abundant in the most stations showing a mean of (62.83±68.85 ind./m2), (41.83±50.75 ind./m2) and (14.67±28.92 ind./m2) with a total of 754 ind./m2 , 502 ind./m2 and 310 ind./m2 respectively. The present study of benthic infauna included polychaeta (81.65%), gastropoda (1.62%), bivalvia (1.22%), crustacean (10.86%), and others (4.66%). Polychaeta was dominant by contributing 81.65% of the total benthic infauna.The water quality parameters showed a significant correlation among themselves particularly a very strong negative correlation between pH and salinity (r = -0.832, p<0.05), and DO and salinity (r = -0.796, p<0.05) while strong negative correlation was between transparency and salinity (r = -0.655, p<0.01). The maximum (1.721) Shannon index (H) of species diversity was found at station S2 during pre-monsoon and the lowest (1.247) at station S1 during monsoon. The present study sites were heavily polluted in monsoon (H=1.247) while pollution is moderate in other stations during monsoon and post-monsoon. Therefore, the information which is included here can be used to measure the impact of pollution, to conserve biodiversity of the study areas and anyone can use it for further study.

Md. Anwar Hossain

Senior Officer, Sonali Bank Ltd.

Thesis Title: Fisheries Diversity in Relation to Ecological Variables in Nijhum Dwip Island

Overview: Estimate seasonal fish catch composition (by number and weight) of Nijum dwip island. Estimated and analyse fisheries biodiversity indices of the catch. Established relationship between environment parameter with seasonal variation of fish abundance /biodiversity

Saborni Swarna Das

Teacher (Govt. Primary School)

Thesis Title: Population Dynamics of Eleutheronema tetradactylum from Central coast of Bangladesh

Overview: The study was conducted to population parameters of Eleutheronema tetradactylum obtained from three main landing sites of Nijhum Dwip from January, 2014 to June 2014. A total 436 data were measured for length frequency analysis for the studied species. Electronic Length Frequency Analysis (ELEFAN) method was applied to analyze the population dynamics parameters namely theoretical maximum length (L∞), growth factor (K), Mortality, Probability of capture and recruitment pattern. FiSAT software based ELEFAN developed by FAO was used for this study. The von Bertalanffy growth parameters L∞ and K of the species were 12.6 cm and 0.55 year-1 respectively. The instantaneous rate of total mortality (Z) was estimated as 1.02 year-1 respectively. The value of exploitation rate (E) was found to be 0.40 (< 0.50) which clearly pointed toward near standard level of exploitation rates. The recruitment pattern of the species was found continuous all the year round with one peak at monsoon in the month of July by 20.52 %. However, from Relative yield per recruit (Y'/R) and biomass per recruit (B'/R) the maximum allowable limit of exploitation (Emax) was found to be 0.619. The exploitation rate was less than the predicted Emax value indicated that the stock of Eleutheronema tetradactylum was found to be under exploited in the investigated area. The findings concluded with recommendation for protection of undersize fishing with destructive gear for sustainable stock management of the studied species.

Ashish Chandra Saha

Self employed

Thesis Title: Biosocioeconomic analyses of fisheries resources in Hatiya Island

Overview:

Md. Nayem Uddin

Self employed

Thesis Title: Diversification and Marketing Channel of Fish Trading in different Fish Market of Noakhali Region

Overview: Identifed the diversity of fish trade in the selected market and existing fish marketing system. Identified marketing problems and accessed the socio-economic condition of fish traders.

Sirajum Monira Shanta

Research Associate, WorldFish Centre

Thesis Title: Study on Fishing Crafts and Gears used in NijhumDwip Island, Bangladesh

Overview: The study describes traditional fishing crafts and gears used by fishermen including small, medium and large scale fishing at NijhumDwip Island in Noakhali, Bangladesh. Primary data were collected from local fishermen through PI (Personal Interview), FGD (Focus Group Discussion) and observation. Secondary data were collected from DFO (District Fisheries Officer), UFO (Upazilla Fisheries Officer) and DoF (Department of Fisheries). The study revealed seven different types of fishing nets including three Fixed Purse nets (Behundijal, Bata jal, Pl collection net), one Framed or Dip net (Thelajal), three Gill nets (Chandijal, Ilishjal, Coral jal)used at NijhumDwip Island.

Md. Abdul Hannan

Banker

Thesis Title: AQUACULTURE INTENSIFICATION IN NOAKHALI REGION

Overview: The study was conducted in Subornochar upozila and Begumganj upozila under Noakhali district to know the culture system and intensification level of the study area, to know the productivity of fin and shell fish in the study area, to know the level of carrying capacity.The study was conducted on 16 ponds from each sides total 32 ponds and the study period was from July to December . Data were collected through questionnaire interview, field observation and KII.

Md. Mohiful Kabir

Employed at NSTU

Thesis Title: Marketing channel of fish fry of River Halda and socioecnomic condition of associated people.

Overview: Halda River is the only tidal river in the world, has been reported to serve as a natural source of fertilized carp eggs. This study entails various marketing channels of carp fry of Halda River at different rearing stages and socio-economic conditions of the fry traders. Snowball sampling of data collection was followed through Focus Group Discussion (FGD), semi-structured questionnaire interview and cross-check interview with key informants. The results reveal that local egg collectors of Halda River collect carp eggs from May-July and hatch them by their indigenous hatching techniques. After 4-5 days of hatching, egg collectors start to sell the fry to fish farmers from different nooks of Bangladesh at the rate of BDT 40,000-60,000 kg–1. Halda fry has a complex market chain than other hatchery fry. The fry distributed in four different ways i.e., firstly from fry sellers to local fish consumers via local fish farmers and pond owners; secondly from fry sellers to nationwide fish farmers via hatchery owners and technicians; thirdly from fry sellers to renowned public fish hatchery in order to produce mother fish and finally from fry sellers to government Halda brood restoration project in order to enrich Halda River with more brood fish. This study also evaluated the socio-economic conditions of the traders. Most of traders (84%) were satisfied by involving themselves with Halda fry collection and marketing whereas rest of them (16%) was not satisfied due to their uncertain livelihood conditions in the off season.

Subrata Sinah

NGO Job

Thesis Title: Population dynamics of Notopterus notopterus (Pallas, 1769) from Kaptai Reservoir

Overview: The study on the population dynamics of fishes has considerable importance in fishery research especially for the study of patterns of growth in fish stocks. This aspect is useful in rationally managing the population of fishes. Population parameters of Notopterus notopterus (Pallas, 1769) were estimated with length-frequency data collected from Kaptai Reservoir of Ragamati, Chittagong region in Bangladesh during the period from January 20013 to December 2013.

Mitu Kunda

Teacher (Govt. Primary School)

Thesis Title: Biosocioeconomic analyses of ESBN fishery of Char Alexader

Overview: 1. To find out the fish production efficiency from ESBN catch. 2. To know the socio-economic condition of the fishing community. 3. To find out some management options for ESBN fishery.

Md. AkramUllah

Assistant Professor, NSTU

Thesis Title: Studies on Vulnerability threat and Aadaptation of Coastal fishers’man’s lLivelihood in Changing Climatic Situation in Greater Noakhali Coast

Overview: 1. To develop a grounded understanding of the links between threats and the vulnerability of coastal fisherman to climate change impacts. 2. To know Existing and Potential threats to the fisherman due to the climatic change in the study area. 3. To know the existing and future adaptation measures for Coastal fisherman communities in the study area.