Papers by Manmatha Nath Sarker
Bangladesh Journal of Zoology
We monitored the Condition Index (CI) of Labeo rohita, which is an important indicator to evaluat... more We monitored the Condition Index (CI) of Labeo rohita, which is an important indicator to evaluate the health and well-being of the cultured fish. In this pilot project, we initiated the culture with Labeo rohita as a candidate species in 12 rain water stocked ponds at Diamond Harbour during March, 2022 to October, 2022 and computed monthly condition index considering the mean weight and length of the cultured species (n = 65 for each pond). Simultaneously we measured the relevant hydrological parameters like surface water temperature, Dissolved Oxygen (DO), surface water pH, dissolved NO3, PO4 and SiO3 for all the ponds. We observed significant positive correlations of CI with surface water temperature, DO, and surface water pH, and significant negative correlations with dissolved NO3 and PO4. The results reveal the use of CI of Labeo rohita as proxy to well-being of the species. Bangladesh J. Zool. 50(3): 309-319, 2022
Bangladesh Journal of Zoology
Shrimp aquaculture plays the key role in Bangladesh seafood export industry. It includes the spec... more Shrimp aquaculture plays the key role in Bangladesh seafood export industry. It includes the species of Tiger prawn Penaeus monodon, and Giant river prawn Macrobrachium rosenbergii, which have been widely farmed after 1980s. The industry is severely damaged due to diseases outbreaks in hatcheries, nurseries and grow-out ponds since 2000, thus this sector shows shrinkage from global export market. However, the last few decades an alternate aquaculture decapod species, Whiteleg shrimp Litopenaeus vannamei has been recognized as the most important in world-seafood export item. Bangladesh aquaculture has very recently been introduced with the Whiteleg shrimp L. vannamei for shrimp production boost up. This review focusses on the current state of arts for L. vannamei aquaculture techniques and their possible implication to farming in Bangladesh. Recently, several Whiteleg shrimp pilot scale farming were initiated which showed promising production ranged from 5.0 to 8.9 MT/ha. Private ent...
Bangladesh Journal of Zoology, 2021
Stock Assessment of Tenualosa ilisha (Hamilton, 1822) were estimated using FiSAT-II software with... more Stock Assessment of Tenualosa ilisha (Hamilton, 1822) were estimated using FiSAT-II software with length-frequency data collected from different landing centers. The Southeast Coast of Bay Of Bengal, Cox's Bazar. The Von Bertalanffy growth parameters Land K for the species were asymptotic length (L∞) was 51.41 cm, growth rate (K) was 0.75 year-1 and t0 = -0.2 year respectively. The estimated value of total mortality (Z) based on length converted catch curve using these growth parameters was 2.35 year-1.Natural mortality (M) based on growth parameters and mean environmental temperature (T = 27° C) was 1.00 year-1 and fishing mortality (F) was 1.35 year-1. Optimum length of hilsa at first capture (Lc=L50) was 28.36 cm TL. Growth performance indices (φ') was 3.30. The estimated value of the exploitation rate (E) using the length-converted catch curve was 0.57. The recruitment pattern of this species was continuous and two peaks per year. The present investigation clearly showe...
Bangladesh Journal of Zoology, 2019
Hilsa shad (Tenualosa ilisha) belonging to the family Clupeidae is a diadromous migratory fish sp... more Hilsa shad (Tenualosa ilisha) belonging to the family Clupeidae is a diadromous migratory fish species. It is an important fish in the countries bordering to the Bay of Bengal. Bangladesh harvest about 60% of world hilsa catch. Hilsa contributed12.9% of the country’s total fish production in 2017-2018 with an estimated annual production of 517,198 tons, which was 1.0% to the GDP to support livelihoods of 1.2 million hilsa fishers of Bangladesh. In spite of the importance, there was an alarming situation in hilsa production, where over fishing of hilsa with a result of decline in inland production were observed. In the present study age and growth parameters L=57.7 cm total length and growth rate K=0.90 per year were calculated using VBGF growth function. Population parameters Z=4.90 were calculated using length converted catch curve, M (at water temperature 27°C) =1.45 using Pauly’s formula, F=1.09 and E=70 were estimated. Results indicates both recruitment overfishing and growth ov...
Bangladesh Journal of Zoology, Feb 25, 2018
Population parameters of Harpadon nehereus were estimated using FiSAT-II. length-frequency data c... more Population parameters of Harpadon nehereus were estimated using FiSAT-II. length-frequency data collected from different landing centers along the coast of Bangladesh. The Von Bertalanffy growth parameters L and K for the species were 45.05 cm and 1.30/year, respectively. The annual rate of natural mortality (M) and fishing mortality (F) were found to be 1.86 and 2.58, respectively. The estimated value of the exploitation rate (E) using the lengthconverted catch curve was 0.58 and E max was found to be 0.582. The recruitment pattern of this species was continuous and two peaks per year. The present investigation clearly showed the over fishing (E > 0.50) condition for H. nehereus in Bangladesh. The estimated length-weight relationship for the combined sex was found to be W = 0.003199 L 3 .
The anadromous fish species Hilsa (Tenualosa ilisha) constitutes the largest single fishery in Ba... more The anadromous fish species Hilsa (Tenualosa ilisha) constitutes the largest single fishery in Bangladesh and West Bengal, India and is known for its delicacy throughout the world. It is a sociocultural symbol of Bengalis across the globe. The aquatic phase of the Ganga-Bhagirathi River system is the important habitat for Hilsa as the major breeding and nursing grounds are situated along this portion of the river. In this paper, we investigate the impact of several stressors on the survival and growth of the species in the backdrop of climate change.
Population parameters of Harpadon nehereus were estimated using FiSAT-II. length-frequency data c... more Population parameters of Harpadon nehereus were estimated using FiSAT-II. length-frequency data collected from different landing centers along the coast of Bangladesh. The Von Bertalanffy growth parameters L and K for the species were 45.05 cm and 1.30/year, respectively. The annual rate of natural mortality (M) and fishing mortality (F) were found to be 1.86 and 2.58, respectively. The estimated value of the exploitation rate (E) using the lengthconverted catch curve was 0.58 and E max was found to be 0.582. The recruitment pattern of this species was continuous and two peaks per year. The present investigation clearly showed the over fishing (E > 0.50) condition for H. nehereus in Bangladesh. The estimated length-weight relationship for the combined sex was found to be W = 0.003199 L 3 .
Hilsa shad (Tenualosa ilisha) belonging to the family Clupeidae is a diadromous migratory fish sp... more Hilsa shad (Tenualosa ilisha) belonging to the family Clupeidae is a diadromous migratory fish species. It is an important fish in the countries bordering to the Bay of Bengal. Bangladesh harvest about 60% of world hilsa catch. Hilsa contributed12.9% of the country's total fish production in 2017-2018 with an estimated annual production of 517,198 tons, which was 1.0% to the GDP to support livelihoods of 1.2 million hilsa fishers of Bangladesh. In spite of the importance, there was an alarming situation in hilsa production, where over fishing of hilsa with a result of decline in inland production were observed. In the present study age and growth parameters L=57.7 cm total length and growth rate K=0.90 per year were calculated using VBGF growth function. Population parameters Z=4.90 were calculated using length converted catch curve, M (at water temperature 27°C) =1.45 using Pauly's formula, F=1.09 and E=70 were estimated. Results indicates both recruitment overfishing and growth over fishing occur through indiscriminate fishing of juvenile hilsa (Jatka) as wel as brood hilsa(mother). Fishing effort has to be reduced at any cost and the affected fishers should be rehabilitated in a proper manner for obtaining the sustainable production of hilsa resources.
Bangladesh J. Zool. 48(2): 231-241, 2020 ISSN: 0304-9027 eISSN: 2408-8455, 2020
Stock Assessment of Tenualosa ilisha (Hamilton, 1822) were estimated using FiSAT-II software with... more Stock Assessment of Tenualosa ilisha (Hamilton, 1822) were estimated using FiSAT-II software with length-frequency data collected from different landing centers. The Southeast Coast of Bay Of Bengal, Cox's Bazar. The Von Bertalanffy growth parameters Land K for the species were asymptotic length (L∞) was 51.41 cm, growth rate (K) was 0.75 year-1 and t0 =-0.2 year respectively. The estimated value of total mortality (Z) based on length converted catch curve using these growth parameters was 2.35 year-1 .Natural mortality (M) based on growth parameters and mean environmental temperature (T = 27° C) was 1.00 year-1 and fishing mortality (F) was 1.35 year-1. Optimum length of hilsa at first capture (Lc=L50) was 28.36 cm TL. Growth performance indices (ϕ') was 3.30. The estimated value of the exploitation rate (E) using the length-converted catch curve was 0.57. The recruitment pattern of this species was continuous and two peaks per year. The present investigation clearly showed the over fishing (E > 0.50) condition for T. ilisha in Bangladesh. The estimated length-weight relationship for the combined sex was found to be W = 0.0109 L 3. Virtual population analysis (VPA) showed that the maximum fishing mortality occurring in the length between 30 to 35 cm with a maximum value in the length of 32 cm that repeatedly indicate high fishing mortality in the T. ilisha. The generalized length-weight relationship was fitted with the pooled data of all monthly samples were BW = 0.029 TL 2.718 (R 2 = 0.833) respectively. The results revealed that all length-weight relationships were highly correlated (r > 0.993). Maximum sustainable yield (MSY) was estimated as 435,554 t.
A, B, C of Environment.(Eds. Dr. Abhijit Mitra, Dr. Tanmay Ray Chaudhuri, Dr. Prosenjit Pramanick). Konnagar Municipality, Govt. of West Bengal, India 73 G.T. Road West, Konnagar, Hooghly 712235. Article 10: 239-246
Books by Manmatha Nath Sarker
The tale of Anadromous Fish Tenualosa ilisha (Hamilton, 1822), the Monsoon Delicacy of Bengal, 2020
Abstract
The anadromous fish species Hilsa (Tenualosa ilisha) constitutes the largest single fish... more Abstract
The anadromous fish species Hilsa (Tenualosa ilisha) constitutes the largest single fishery in
Bangladesh and West Bengal, India and is known for its delicacy throughout the world. It is a sociocultural symbol of Bengalis across the globe. The aquatic phase of the Ganga-Bhagirathi River system
is the important habitat for Hilsa as the major breeding and nursing grounds are situated along this
portion of the river. In this paper, we investigate the impact of several stressors on the survival and
growth of the species in the backdrop of climate change.
Keywords: Tenualosa ilisha, stressors, survival and growth, climate change
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Papers by Manmatha Nath Sarker
Books by Manmatha Nath Sarker
The anadromous fish species Hilsa (Tenualosa ilisha) constitutes the largest single fishery in
Bangladesh and West Bengal, India and is known for its delicacy throughout the world. It is a sociocultural symbol of Bengalis across the globe. The aquatic phase of the Ganga-Bhagirathi River system
is the important habitat for Hilsa as the major breeding and nursing grounds are situated along this
portion of the river. In this paper, we investigate the impact of several stressors on the survival and
growth of the species in the backdrop of climate change.
Keywords: Tenualosa ilisha, stressors, survival and growth, climate change
The anadromous fish species Hilsa (Tenualosa ilisha) constitutes the largest single fishery in
Bangladesh and West Bengal, India and is known for its delicacy throughout the world. It is a sociocultural symbol of Bengalis across the globe. The aquatic phase of the Ganga-Bhagirathi River system
is the important habitat for Hilsa as the major breeding and nursing grounds are situated along this
portion of the river. In this paper, we investigate the impact of several stressors on the survival and
growth of the species in the backdrop of climate change.
Keywords: Tenualosa ilisha, stressors, survival and growth, climate change