Harunur Rashid | Bangladesh Agricultural University (original) (raw)

Papers by Harunur Rashid

The present study was conducted to evaluate the effects of dissolved oxygen concentrations on gro... more The present study was conducted to evaluate the effects of dissolved oxygen concentrations on growth, survival and gonadal development of freshwater pearl mussel (Lamellidens marginalis). Twenty adult L. marginalis were exposed to each of the five different concentrations of dissolved oxygen (DO) i.e (T0, no aeration), and T1, T2, T3 and T4 with one, two, three and four air stone aerators, respectively in fifteen glass aquaria each containing 10L of pond water. DO concentrations were significantly higher in all the treatments compared to the control but there were no significant differences among the treatments. There were significant differences in the growth and survival rates between control and treatments. The relative growth rates (%) were significantly higher in the highest oxygen concentration (T4) compared to other treatments. The survival rate was zero in control (T0), whereas it was 66.67%, 70.00%, 71.67% and 73.33%, respectively for T1, T2, T3 and T4. On day-30, oocytes in T0 were found to be smaller in size, with developing acini and no previtellogenic oocytes; whereas in T1, T2, T3 and T4, previtellogenic oocytes and larger acini were evident. On day-60, vitellogenic oocytes along with few underdeveloped oocytes started to detach from the acini walls, as well as some already started migration to germinal duct on day-90. This indicates that ovaries of all the treatments were ripe and were ready to spawn between day-60 and-90. On day-30, secondary spermatocytes were observed in testicular acini in case of T0, whereas more developed and dense spermatids were evident in T1, T2, T3 and T4. These results indicate that testes were in late development stages in T0, whereas they were ripe in all the treatments. The current findings indicate that hypoxia slows down growth, reduces survival rate and retards development of reproductive organs in L. marginalis.

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Aquaculture Studies, 2021

In the quest for appropriate management strategies for less egg production in Nile tilapia (Oreoc... more In the quest for appropriate management strategies for less egg production in Nile tilapia (Oreochromis niloticus) due to climate change induced increasing temperature, five treatments (T): shade with cloth over brood hapa (T1), increase in pond depth (T2), aeration (T3), combination of above three interventions (T4) and control (no intervention) (T5) were investigated in a commercial hatchery in Mymensingh, Bangladesh during April to September. Mean egg production in T1, T2, T3, T4 and T5 was 20488, 15369, 3596, 21021 and 3979 eggs/hapa, respectively. T1 was the best strategy considered due to efficiency and simplicity. In May T1, T2, T3, T4 and T5 produced highest 30859, 36119, 8997, 45876 and 5506 eggs/hapa at 29.69°C, 30.12°C, 29.96°C, 29.61°C, and 31.26°C temperature, respectively. The most suitable water temperature for highest egg production (20365 eggs/hapa) was 29-31°C. Egg production above 32°C was found to be very low (179 eggs/hapa). Suitable ranges of dissolved oxygen, pH, alkalinity, ammonia and turbidity for egg production were found to be 4.5-6.0 mg/L, 8.0-8.8, 105-150 mg/L, 0-0.5 mg/L and 15-35 cm, respectively. In high temperature months commercial fish hatcheries should use shed with cloth over brood hapa to produce higher amount eggs.

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Journal of the Sylhet Agricultural University, 2014

Fish cage culture allows intensive production in waterbodies without conventional preparation for... more Fish cage culture allows intensive production in waterbodies without conventional preparation for aquaculture.Considering the importance and prospects of cage culture in Bangladesh, the present experiment was undertaken to study the effect of stocking density on growth performances and production potential of tilapia (Oreochromis niloticus) under cage culture conditions and to develop a suitable method of tilapia cage culture in inland open water body like Old Brahmaputra River. Three stocking densities (100, 150 and 200 fish m-3) of 2.78 g mean initial individual body weight of fingerlings in three different treatments (T-100, T-150 and T-200) each with three replicates were used. The fishes were supplied with high protein (30%) commercial feed at 10% of body weight twice daily. Water quality parameters namely transparency, temperature, pH, dissolved oxygen, phosphate were found within the suitable limit for fish culture.The result of the present study showed that the fish in the treatment T-150 resulted the best individual weight gain (90.72g), average daily gains (0.67 g), percent weight gains (3263%), specific growth rates (1.13%day-1) and the net production rates (13608gm-3 135 days-1)followed by treatments T-100 and T-200, respectively.The net yield and growth performances showed a significant difference with increasing stocking density (P<0.01). The most effective stocking density was150 fish m −3 cage for Nile tilapia considering growth performances and production potential. Therefore, it can be concluded the growth performance of Nile tilapia is density dependent.

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International Journal of Agricultural Research Innovation and Technology, 2014

A study was conducted to assess the effects of different kinds of inorganic fertilizers on the pr... more A study was conducted to assess the effects of different kinds of inorganic fertilizers on the production of fishes in six ponds during October to December 2011. There were three treatments with two replications under each treatment and each of the ponds was stocked with 80 fish fry. In treatments I, II and III, ponds were fertilized fortnightly @ urea 100 g decimal-1, T.S.P. 100 g decimal-1 and urea 50 g decimal-1 + T.S.P. 50 g decimal-1, respectively. Selected water-quality parameters of ponds under study were more or less similar and within the productive range. Mean phytoplankton and zooplankton densities under
treatments I, II and III were 57.08 ± 1.35, 8.80 ± 0.09 and 77.29 ± 3.72, 12.88 ± 0.74 and 98.93 ± 1.61, 16.16 ± 1.75 (x103) cells L-1, respectively. The net and gross fish productions of the ponds under treatments I, II and III were 0.85 and 3.11 t ha-1 yr-1 and 1.32 and 3.58 t ha-1
yr-1 and 1.85 and 4.11 t ha-1 yr-1, respectively. Fish production under treatment III was better than those under treatments I and II because plankton population densities under treatment III was the highest. Therefore, the mixed fertilization is suitable for production of plankton that enhance growth and production of fishes.

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Chemosphere, 2018

The use of organophosphate pesticides (OPPs) to protect a variety of crops has increased in Bangl... more The use of organophosphate pesticides (OPPs) to protect a variety of crops has increased in Bangladesh.
OPPs may contaminate surrounding aquatic environments through several routes including spray drift, surface runoff and groundwater leaching. Since it is unknown how much OPP end ups in aquatic environment in Bangladesh, the objectives of the present study were to quantify the residues of ten most
commonly used OPPs in water and sediment of water bodies of north-west Bangladesh and to assess
their ecological risks for aquatic organisms. The risks of the pesticides in surface water and sediment
were assessed using a first-tier risk quotient (RQ) approach. The higher-tier PERPEST model was used to
refine the ecological risks of pesticides when RQ indicated a potential risk. Results showed the most
frequently detected pesticides that appeared in high concentrations were chlorpyrifos, diazinon and
quinalphos in surface water and sediment. The highest concentration of OPPs measured in water was
9.1 mg chlorpyrifos/L (median of 1.95 mg/L), while this was 51 mg diazinon/kg dw (median of 11 mg/kg dw)
for sediment. Furthermore, results showed high acute and/or chronic RQs (RQ > 1) in surface water and
sediment for chlorpyrifos, diazinon, quinalphos, malathion and fenitrothion. The higher-tier PERPEST
model confirmed risks of chlorpyrifos, diazinon, quinalphos and fenitrothion for aquatic insects, microand macro-crustaceans which were previously derived by RQ-based risk assessment for aquatic organisms. Furthermore, the results of the PERPEST model also indicated possible indirect effects of these
pesticides on algae and macrophytes, community metabolism, rotifers and other macro-invertebrates.

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Progressive Agriculture, 2018

The study was carried out to determine the effect of temperature changes on acute toxicity of pyr... more The study was carried out to determine the effect of temperature changes on acute toxicity of pyrethroid pesticide cypermethrin in zebrafish. A two-day renewal bioassay system for 96h was conducted to find out LC50 value of cypermethrin at two temperature regimes i.e. 25°C and 30°C considering as T1 and T2, espectively. During the determination of LC50 in both temperatures, blood glucose (mg/dL) levels were measured at lower concentration (0.25 μg/L) of cypermethrin. The results of acute toxicity test at 96h LC50 values were calculated through probit analysis. It was found that 96h LC50 for T1 and T2 groups were about 2.1 and 1.4 μg/L, respectively. Significantly lower LC50 of cypermethrin at T2 compared to T1 showed that higher temperature increased the toxicity of cypermethrin. There was a significant increase (P<0.05) in blood glucose level (mg/dL) in 0.25 μg/L compared to 0 μg/L concentration of cypermethrin at both treatments. Dissolved oxygen decreased and free CO2 increased significantly (P<0.05) with increasing temperature, while the pH of the water was almost unchanged throughout the study period. The present study indicated the impact of increased temperature on pesticide toxicity in the aquatic ecosystem.

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Bangladesh Journal of Fisheries, 2020

The study was focused on the culture of freshwater zooplankton Daphnia magna under different feed... more The study was focused on the culture of freshwater zooplankton Daphnia magna under different feed trials. D. magna was collected from a pond and isolated based on its distinct morphological characteristics. They were cultured in 12 glass jars containing 700 mL of tap water with different feeding regimes: control (tap water only), green water (25 ml/L) (Tg), yeast (50 g/L) + green water (25 ml/L) (Tyg) and yeast (16.6 g/L) + powdered green pea (16.6 g/L) + brown flour (16.6 g/L) (Tygb). Each of the control and feed trials was set up in three replicates. Feeding and population count took place every third day over an experimental duration of 21 days. The highest population density of D. magna was found in Tyg on day 15, which was 207.1 individuals/L and the lowest was found in control, which was 23.80 individuals/L. Results showed relatively better growth performance of D. magna in mixed feed trials compared to single or 'no feed' trial. Among three feed trials, Tyg incurred the lowest cost compared to others and the cost to production ratio was 7.8. The culture technique that have been standardized in the present study could be applied to fish hatcheries and nurseries in Bangladesh.

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Aquaculture Reports, 2020

Among the environmental factors, photoperiod plays an important role in growth and reproduction o... more Among the environmental factors, photoperiod plays an important role in growth and reproduction of fish. This study was conducted to assess the effects of photoperiod on growth of juveniles and reproductive functions of matured female rohu (Labeo rohita), a commonly cultured freshwater fish species. Two experiments were conducted each with three different photoperiod treatments, such as 6 h of light and 18 h of dark (06L:18D), 12 h of light and 12 h of dark (12L:12D), and 18 h of light and 6 h of dark (18L:06D), each treatment with three replications. In the first experiment, fingerlings (2.39 ± 0.35 g BW, 6.67 ± 1.23 cm TL) were exposed in the three photoperiod conditions for 30 days and sampled fishes were sacrificed on 7, 15 and 30 days of exposure to measure growth parameters (weight gain (g); percent weight gain; specific growth rate, SGR and feed conversion ratio, FCR) and major hemato-biochemical parameters (Hemoglobin, Hb; Red blood cell, RBC; White blood cell, WBC and blood glucose). Final weight gain (g), percent weight gain and SGR were highest in 12L:12D and the lowest in 18L:06D conditions. FCR was lowest in 12L:12D conditions. In prolonged photoperiod (18L:06D), the Hb and RBC decreased significantly, while WBC and blood glucose level increased significantly during initial days of exposure. In the second experiment, sexually matured females were exposed in the three photoperiod conditions for 30 days and the sampled fishes were sacrificed on 0, 15 and 30 days of exposure to know gonadosomatic index (GSI) and gonadal histology. The mean GSI values, oocyte diameter and proportions of vitellogenic oocyte were maximum in the fishes of 06L:18D treatment indicating stimulation of vitellogenesis. On the other hand, the same parameters were minimum in the fishes of 18L:06D, revealing the inhibition of vitellogenesis. This study indicates that prolonged photoperiod negatively affect growth and reproductive performances of rohu.

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Frontiers in Microbiology, 2020

The highly populated coasts of the Bay of Bengal are particularly vulnerable to water-borne disea... more The highly populated coasts of the Bay of Bengal are particularly vulnerable to water-borne diseases, pollution and climatic extremes. The environmental factors behind bacterial community composition and Vibrio distribution were investigated in an estuarine system of a cholera-endemic region in the coastline of Bangladesh. Higher temperatures and sewage pollution were important drivers of the abundance of toxigenic Vibrio cholerae. A closer relation between non-culturable Vibrio and particulate organic matter (POM) was inferred during the post-monsoon. The distribution of operational taxonomic units (OTUs) of Vibrio genus was likely driven by salinity and temperature. The resuspension of sediments increased Vibrio abundance and organic nutrient concentrations. The δ 13 C dynamic in POM followed an increasing gradient from freshwater to marine stations; nevertheless, it was not a marker of sewage pollution. Bacteroidales and culturable coliforms were reliable indicators of untreated wastewater during pre and post-monsoon seasons. The presumptive incorporation of depleted-ammonium derived from ammonification processes under the hypoxic conditions, by some microorganisms such as Cloacibacterium and particularly by Arcobacter nearby the sewage discharge, contributed to the drastic 15 N depletion in the POM. The likely capacity of extracellular polymeric substances production of these taxa may facilitate the colonization of POM from anthropogenic origin and may signify important properties for wastewater bioremediation. Genera of potential pathogens other than Vibrio associated with sewage pollution were Acinetobacter, Aeromonas, Arcobacter, and Bergeyella.

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Journal of Environmental Science and Health, Part B, 2019

This study assessed the long-term toxicity of chlorpyrifos on survival and reproduction of Banded... more This study assessed the long-term toxicity of chlorpyrifos on survival and reproduction of Banded Gourami by using mortality, gonado-somatic index (GSI) and histopathological observations as endpoints. Adult fish were exposed to five different concentrations of chlorpyrifos (0, 15, 50, 150, 500 µg/L) in 15 PVC tanks for 15, 30, 45, 60 and 75 days. Results showed that all male and female fish died after 15 days of 500 µg/L chlorpyrifos exposure. No consistent significant effect was observed for both male and female GSI. Furthermore, results showed dose- and time-dependent histopathological alterations for both ovary and testes. The 60-d No Observed Effect Concentration (NOEC) for most histopathological alterations of Banded Gourami ovary and testes was 50 μg/L, while 60-d NOEC for mortality of both male and female fish was < 15 μg/L. The results show that the long-term exposure to chlorpyrifos not only affect the reproductive tissues of Banded Gourami at exposure concentrations but also cause their mortality. Future studies should evaluate effects at lower concentrations.

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Dingapota (about 8000 ha) is the largest haor (a vast saucer-shaped low floodplain area) of Mohon... more Dingapota (about 8000 ha) is the largest haor (a vast saucer-shaped low floodplain area) of Mohongonj Upazilla under Netrokona district of Bangladesh. The haor contains 10 to 12 feet water for about 5-6 months of the year. Dingapota is rich in indigenous fish species, particularly during monsoon. Wager level starts to decrease in December after rainy season is over and a lot of fishes are caught at that time. Many of the threatened fish species of the country wihch are not found in other waterbodies are often available in Dingapota and other neighboring haors. A survey conducted during December-May 2011 in the Dingapota haor to assess biodiversity of threatened fish species. The survey supparized that the fish biodiversity of Dingapota is declining day by day. the main reasons for decline of biodiversity and overall availability of fishes, according to the questionnaire survey and data collected from fishermen adn other people adjacent to Dingapota haor were siltation, indiscriminate fishing, fishing brood fish and fry during breeding season, use of illegal fishing gears, filling-up of connections between river and haor, use of katha fishing and faulty leasing systems of Jalmohal.

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Fisheries and Aquaculture News – Bangladesh, 2016

Swamp eel (Monopterus cuchia), commonly known as ‘cuchia’ in Bangladesh, belongs to the order Syn... more Swamp eel (Monopterus cuchia), commonly known as ‘cuchia’ in Bangladesh, belongs to the order Synbranchiformes. This fish lives in freshwater habitats and is distributed among different South Asian countries including Bangladesh. In Bangladesh, this fish used to be commonly available in different openwater habitats like floodplains, beels, canals, haors, baors, etc.; now its availability is scarce and considered as a threatened (vulnerable) species according to IUCN Red List. Mud eel is considered as one of the tasty and nutritional food fish for human as it contains high quality protein, calcium, unsaturated fat, vitamin A and E, EPA and DHA. Moreover, it is used for therapeutic and traditional treatment for weakness, anemia, asthma, hemorrhoids, piles and diabetes (Narejo et al., 2003). Culturally Bangladeshi people doesn’t like this fish as the appearance of the fish is similar to snake but most tribal people, some other non-muslim castes and a few Muslims eat this fish. However, mud eel is one of the commercially important fish due to its high demand for export. More than 8,000 fishers, many traders, transporters and exporters are engaged in this sector. Bangladesh exports mud eel mostly to China, Japan, Hong-Kong, Taiwan, Thailand, Singapore and USA. In 2002, freshwater eel ranked 4 in terms of frozen food export items (Hasan et al., 2012).
Recently, abundance of this species in nature has been declined due to heavy fishing pressure, habitat destruction, aquatic pollution and indiscriminate use of pesticides in crops. Now, it is an endangered fish species of Bangladesh (IUCN Bangladesh, 2003). Despite the increasing demand and decreasing production of the fish in nature, it is high time to think about the commercial production of mud eel because there are lots of opportunities to culture it in shallow and small ponds, ditches, tanks or cisterns. Some people are trying to culture this fish but availability of fingerling in nature is less and no commercial hatchery is yet to produce the spawn or fingerling of mud eel. These are the big obstacles to proceed further with the commercial production of mud eel. Although initiatives have already been taken for artificial breeding and culture of the fish in captivity but no transferrable technology has yet been developed. Lack of knowledge and information on reproductive biology of mud eel are the most important constraints. Therefore this study was undertaken at Department of Fisheries Management, Bangladesh Agricultural University, Mymensingh, to develop captive breeding protocol of mud eel.

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Golden Jubilee Souvenir 2018, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh, 2018

Bangladesh Agricultural Univ ersity, Mymensingh 2Department of Fisheries, Barisal 3Bangladesh Shr... more Bangladesh Agricultural Univ ersity, Mymensingh 2Department of Fisheries, Barisal 3Bangladesh Shrimp & Fish Foundation, Dhaka email : harunurTras hid@ gmail. c om j-.a shad (Tenualosa ilisha) is the largest single-species capture fishery of Bangladesh. Seasonal *.sibution of this fish varies between the Bay of Bengal, Padma-Meghna-Brahmaputra estuary and :sream of these river systems. As a result, together with providing important food fish, Hilsa has rEirlrn€ part of life and livelihood for many people in this country even since before pre-colonial history. .-ish once plenty in our waters has undergone serious depletion of stocks around one and a half decade: :. Some of the important factors that are considered to be responsible for Hilsa flshery resources =:radation are: low water flow in our rivers; construction of dams upstream and downstream rivers;-:.-rrestation upsream and downstream enhancing river siltation; construction of roads, embankments and-,nd control structures resulting in partial obstacles to the regular river flow; river pollution from human elements, industries, fertilizers and pesticides (BOBLME Z}l2).These alterations of river ecosystems-.'e adversely affected breeding, spawning and nursing of Hilsa in our rivers and estuaries.-n:equently, many water areas, previously rich in Hilsa, have become scanty. l. recover from this Hilsa resources degradation, Hilsa management strategies were employed by ]+artment of Fisheries (DoF) of the Government of Bangladesh since year 2005.A1 first, the program- .-r limited only to juvenile Hilsa (locally called Jatka) conservation. As a result of this, Jatka catch, :asport and storage were banned for a certain periods of a year (MOFL 2014).Later, expert opinions-.:e to conserve mother Hilsa as well, so that Hilsa spawning can occur interruptedly which will :mately enhance natural production of this fish. Most important part of this strategy is to ban fishing l-v during peak breeding season of this fish in Bangladesh waters (MOFL 2017). As a result, correct

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The neonicotinoid insecticide imidacloprid is used in Bangladesh for a variety of crop protection... more The neonicotinoid insecticide imidacloprid is used in Bangladesh for a variety of crop protection purposes. Imidacloprid may contaminate aquatic ecosystems via spray drift, surface runoff and ground water leaching. The present study aimed at assessing the fate and effects of imidacloprid on structural (phytoplankton, zooplankton, macroinvertebrates and periphyton) and functional (organic matter decomposition) endpoints of freshwater, subtropical ecosystems in Bangladesh. Imidacloprid was applied weekly to 16 freshwater microcosms (PVC tanks containing 400 L de-chlorinated tap water) at nominal concentrations of 0, 30, 300, 3000 ng/L over a period of 4 weeks. Results indicated that imi-dacloprid concentrations from the microcosm water column declined rapidly. Univariate and multivar-iate analysis showed significant effects of imidacloprid on the zooplankton and macroinvertebrate community, some individual phytoplankton taxa, and water quality variables (i.e. DO, alkalinity, ammonia and nitrate), with Cloeon sp., Diaptomus sp. and Keratella sp. being the most affected species, i.e. showing lower abundance values in all treatments compared to the control. The observed high sensitivity of Cloeon sp. and Diaptomus sp. was confirmed by the results of single species tests. No significant effects were observed on the species composition of the phytoplankton, periphyton biomass and organic matter decomposition for any of the sampling days. Our study indicates that (subtropical l aquatic ecosystems can be much more sensitive to imidacloprid compared to temperate ones.

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The objective of the present study was to elucidate the effects of cypermethrin on the embryo and... more The objective of the present study was to elucidate the effects of cypermethrin on the embryo and the larvae of Gangetic mystus, Mystus cavasius. Therefore, fertilized eggs (n = 100) and 1-day-old larvae (n = 100) were exposed to six different concentrations of cypermethrin (0, 2, 4, 8, 16 and 32 μg L −1) in each of the 18 plastic bowls. Each of the treatment and control was maintained in three replicates. The LC 10 and LC 50 values for Gangetic mystus embryos and larvae were calculated using probit analysis. Results showed the mortality of embryos significantly increased with increasing cypermethrin concentrations. The 24-h LC 10 and LC 50 (with 95% confidence interval) values of cypermethrin for embryo were 0.42 (0.14–0.81) and 5.

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The objectives of the current study were to determine the occupational health hazards posed by th... more The objectives of the current study were to determine the occupational health hazards posed by the application of pesticides in rice-prawn concurrent systems of south-west Bangladesh and to assess their potential risks for the aquatic ecosystems that support the culture of freshwater prawns (Macrobrachium rosenbergii). Information on pesticide use in rice-prawn farming was collected through structured interviews with 38 farm owners held between January and May of 2012. The risks of the pesticide use to human health were assessed through structured interviews. The TOXSWA model was used to calculate pesticide exposure (peak and time-weighted average concentrations) in surface waters of rice-prawn systems for different spray drift scenarios and a simple first tier risk assessment based on threshold concentrations derived from single species toxicity tests were used to assess the ecological risk in the form of risk quotients. The PERPEST model was used to refine the ecological risks when the first tier assessment indicated a possible risk. Eleven synthetic insecticides and one fungicide (sulphur) were recorded as part of this investigation. The most commonly reported pesticide was sulphur (used by 29% of the interviewed farmers), followed by thiamethoxam, chlorantraniliprole, and phenthoate (21%). A large portion of the interviewed farmers described negative health symptoms after pesticide applications, including vomiting (51%), headache (18%) and eye irritation (12%). The results of the first tier risk assessment indicated that chlorpyrifos, cypermethrin, alpha-cypermethrin, and malathion may pose a high to moderate acute and chronic risks for invertebrates and fish in all evaluated spray drift scenarios. The higher tier assessment using the PERPEST model confirmed the high risk of cypermethrin, alpha-cypermethrin, and chlorpyrifos for insects and macro- and micro-crustaceans thus indicating that these pesticides may have severe adverse consequences for the prawn production yields.

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This study elucidated the acute toxicity of chlorpyrifos on the early life stages of banded goura... more This study elucidated the acute toxicity of chlorpyrifos on the early life stages of banded gourami (Trichogaster fasciata). To determine the acute effects of chlorpyrifos on their survival and development, we exposedthe embryos and two-day-old larvae to six concentrations (0, 0.01, 0.10, 1.0, 10 and 100 µg L⁻¹) of chlorpyrifos in plastic bowls. Log-logistic regression was used to calculate LC10 and LC50 values. Results showed that embryo mortality significantly increased with increasing chlorpyrifos concentrations. The 24-h LC10 and LC50 values (with 95% confidence limits) of chlorpyrifos for embryos were 0.89 (0.50–1.58) and 11.8 (9.12–15.4) µg L⁻¹, respectively. Hatching success decreased and mortality of larvae significantly increased with increasing concentrations of chlorpyrifos. The 24-h LC10 and LC50 values (with 95% confidence limits) of chlorpyrifos for larvae were 0.53 (0.27–1.06) and 21.7 (15.9–29.4) µg L⁻¹, respectively; the 48-h LC10 and LC50 for larvae were 0.04 (0.02–0.09) and 5.47 (3.77–7.94) µg L⁻¹, respectively. The results of this study suggest that 1 µg L⁻¹ of chlorpyrifos in the aquatic environment may adversely affect the development and the reproduction of banded gourami. Our study also suggests that banded gourami fish can serve as an ideal model species for evaluating developmental toxicity of environmental contaminants.

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Journal of Fisheries and Aquatic Science, 2015

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Sumithion is widely used to control brittle in paddy fields and tiger bug in fish larval rearing ... more Sumithion is widely used to control brittle in paddy fields and tiger bug in fish larval rearing ponds. The objective of this study was to elucidate the toxic effects of sumithion on larval stages of stinging catfish Heteropneustes fossilis. Larvae were exposed to two concentrations (150 and 250 μg/L) of sumithion with one control in three replicates of each. Larvae samples were collected at 20- and 24-h intervals followed by observation under a digital microscope. Exposures of stinging catfish larvae to sumithion produced deformities including irregular head shape, lordosis, yolk sac edema, body arcuation, tissue ulceration, etc. The mortality rates of larvae were significantly increased in response to increase in sumithion concentrations. Furthermore, around 30% of the total adult stinging catfish reared in sumithiontreated aquaculture ponds were found to be deformed permanently. These findings highlight that exposure of stinging catfish to sumithion at the critical and sensitive stages in their life cycle may significantly reduce the number of returning adults. Therefore, the use of sumithion for crop protection needs to be considered carefully and alternatives to sumithion should to be developed for controlling aquatic insects in aqua-ponds during larval rearing.

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The present study was conducted to evaluate the effects of an organophosphorous pesticide malathi... more The present study was conducted to evaluate the effects of an organophosphorous pesticide malathion on histo-architecture of liver and kidney of common carp exposed to two sub-lethal concentrations (1.5 and 3.0 mg/L) for a period of 8 days. The 96 h LC50 value of malathion for common carp was 15.24 mg/L. Several morphological changes were observed in the liver after exposure to the malathion. Hypertrophy of hepatocytes, mild to severe necrosis and minor vacuolation was found in liver exposed to both concentrations. Similarly, a number of changes such as, pycknosis, necrosis, disintegrated renal tubule, vacuole, shrunk glomerulus etc were observed in the kidney exposed to both concentrations. The changes in these vital organs might have resulted in physiological and metabolic dysfunction. Therefore, the use of pesticide in the agricultural field may be a threat to fish health and their population in the aquatic environment.

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Aquaculture Studies, 2021

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Journal of the Sylhet Agricultural University, 2014

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International Journal of Agricultural Research Innovation and Technology, 2014

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Chemosphere, 2018

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Progressive Agriculture, 2018

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Bangladesh Journal of Fisheries, 2020

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Aquaculture Reports, 2020

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Frontiers in Microbiology, 2020

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Journal of Environmental Science and Health, Part B, 2019

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Fisheries and Aquaculture News – Bangladesh, 2016

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Golden Jubilee Souvenir 2018, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh, Bangladesh, 2018

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Journal of Fisheries and Aquatic Science, 2015

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The aim of the study was to observe physiological stress responses of Nile tilapia (Oreachromis n... more The aim of the study was to observe physiological stress responses of Nile tilapia (Oreachromis niloticus) to climate-induced salinity intrusion. 96-hours LC50 test of adult tilapia revealed a value of 15.901 ppt. This value guided us to expose shes in ve sub-lethal salt concentrations of 0, 3, 6, 9 and 12 ppt (designated as T0, T3, T6, T9 and T12, respectively) for four weeks. Chronic exposure to salinity showed faster air gulping and opercular movement, loss of black pigmentation, and increase in excreta and skin mucus secretion with increasing salinities and exposure time. In all the experiments blood glucose increased with exposure time and it was (in mg/dL) 82±4.8, 145±0.58, 50±5.5, 204±32.4 & 123±0.58 at first week and 265±1.53, 320±0.58, 317±1.15, 249±0.58 & 245±0.58 at forth week for T0, T3, T6, T9 and T12, respectively. Red blood cell showed decreasing trend with increasing salinity and exposure time and it was (in mm3) 2.7±0.55, 2.7±0.51, 2.5±0.64, 2.4±1.02 & 1.9±0.6 at rst week and 1.6±0.58, 1.5±0.3, 1.1±0.12, 1.3±0.12, & 0.8±0.06 at fourth week for T0, T3, T6, T9 and T12 respectively. White blood cell showed increasing trend with increasing salinity and exposure time and it was (in mm3) 37±0.58, 50±1.4, 61±8.43, 72±1.15 & 106±4.9 at first week and 67±2.24, 79±1.64, 113±2.46, 104±2.91 & 157±3.47 at fourth week for T0, T3, T6, T9 and T12, respectively. Through this research it was observed that salinity intrusion in freshwater ecosystems due to climate change can cause ecological stresses to freshwater shes that can disrupt different important physiological functioning.
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Background: Mud eel (Monopterus cuchia), commonly called cuchia, is currently an export commodity... more Background: Mud eel (Monopterus cuchia), commonly called cuchia, is currently an export commodity of Bangladesh and supply for this export comes from capture from natural waterbodies alone. Indiscriminate exploitation from fresh waterbodies is resulting in declined natural population of cuchia in Bangladesh. Therefore, this experiment was performed to trial whether fry production of cuchia is possible in artificial and controlled environment like cement cistern.
Methodology: For induced breeding through environment manipulation, breeding pits were constructed inside 4 and 6 m2 cement cisterns. Breeding pit was constructed into a 50 cm thick mud cum organic material (decomposed/semi-decomposed) mixture on the cistern floor composed of five layers (10 cm each; bottom up order) viz. blackish mud from rice field, dried water hyacinth-straw mix, finely chopped banana trunk, decomposed cow dung and mud. This pit was constructed with sloped edges, attached with two cistern walls and occupied around half the area of the cistern. Water was added to maintain a 15 cm layer above the pit top (for a week) to allow the organic materials decomposed. After one week, upon appearance of foam on top, water was drained out and the pit was filled-up with same amount of water again. This process was repeated for at least five weeks until no foam appears. Cistern was then introduced with water hyacinth and a water depth of 25 cm (from the cement cistern bottom) was then maintained thought the spawning season. Mature and domesticated cuchia breeders were then released (during mid-March) into cement cisterns (4 and 6 m2) with breeding pits inside at following densities and sex ratios – 2/m2 at 1:1 (T1) and 1:2 (T2) male to female (cistern size 4 m2), 3/m2 at 1:1 (T1) and 1:2 (T2) male to female (cistern size 4 m2), 4/m2 at 1:1 (T1) and 1:2 (T2) male to female (cistern size 6 m2). Fish husbandry was done following standard protocol and cuchia were fed mostly with live feed. Breeders were then kept undisturbed and allowed to form pairs and breed naturally inside the breeding pits for a period of three and a half months.
Results: During early July, breeding pits were observed keenly to find out any sign of breeding holes constructed by cuchia breeders. One breeding hole per pit was observed in case of T1, T2 and T4; T3 and T6 had 2 holes each; and T5 had highest 3 holes. Numbers of fry collected were 133, 249, 284, 157, 419 and 547 from T1, T2, T3, T4, T5 and T6, respectively. The highest numbers of fry were obtained from the breeding pit constructed in 6 m2 cistern, released with 4 cuchia breeder/m2 and at 1:2 male to female ratio.

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Intensification of agriculture in many parts of the world is indispensable due to its ever increa... more Intensification of agriculture in many parts of the world is indispensable due to its ever increasing population, land scarcity as well as food security needs. Severe agro-climatic conditions (e.g. flash floods, seasonal water scarcity and salinity intrusion in coastal land) pose further difficulties to agricultural crop production. To meet the growing demand of food under the harsh conditions, farmers are using a variety of pesticides indiscriminately; a sharp increase was observed during last few decades. The government of Bangladesh also fosters the pesticide use to amplify the agricultural frontiers and to increase output per acre of land. Residues of pesticide applied on agricultural land enter into the aquatic environment through drain, runoff and spray drift, which may lead to contamination of this environment. In our research, using data from our recent investigations, we have investigated the effects of different agro-pesticides on spawn survival, ontogenic development, haematology and tissue pathology in aquatic animals using fish models. Our experiments show that pesticide can reduce rate of spaw survival and cause developmental deformity during ontogeny, haematological abnormalities, pathology in internal organs like liver, kidney, gill and altered development or even intersexuality in gonads. The above results obtained using fish model can be translated in assuming effects of agro-pesticides on survival, reproduction, abundance and diversity of fish and other animals living in the aquatic ecosystems.

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