S. Dasgupta
I am working on fish reproduction, osmoregulation, sex differentiation, germ cell transplantation, migration, radioecology, biodiversity and ecological function since last 30 years. Presently working as a Principal Scientist in Fish/Animal Physiology in ICAR-Central Institute of Fisheries Education, a deemed to be university.
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Papers by S. Dasgupta
incorporated through treated domestic sewage with varying dosages viz. 79.3 · 105 l ha1 and 67.7 · 105 l ha1 and water productivity in
a controlled carp culture system were assessed in comparison to those involved in a fertilized based one, with a view to correlate among
physical, chemical and biological processes involved in fish yield under the systems. The net water productivities were measured on the
basis of net return values (in Indian rupees; INR) from the carp production systems at a stocking density @ 5000 per ha with four species
combination. Selected relevant water parameters such as dissolved oxygen, total alkalinity, biochemical oxygen demand (BOD5) in sewage
effluent and fertilizer based systems were monitored along with certain biological parameters viz. gross primary productivity, fish
production and water productivity. The nutrient inputs in terms of total ammonia–nitrogen (TAN) in effluents, total nitrogen (TN)
in fertilizers and phosphorus (P2O5) in both effluents and fertilizers were found significantly correlated with biological production.
The results of the experiment revealed that the sewage incorporation at 79.3 · 105 l ha1 yielded similar gross fish production as recorded
from fertilizer based system, whereas net water productivity using sewage as nutrient source was found 64% higher than that of a fertilizer
based system.
study depicts hypoxia induced disruption of the intrinsic pathway of programmed cell death (PCD), leading to embryonic
malformation in the goldfish, Carrasius auratus. Constant hypoxia induced the early expression of pro-apoptotic/tumor suppressor p53 and concomitant expression of the cell death molecule, caspase-3, leading to high level of DNA damage and cell death in hypoxic embryos, as compared to normoxic ones. As a result, the former showed delayed 4 and 64 celled stages and a delay in appearance of epiboly stage. Expression of p53 efficiently switched off expression of the antiapoptotic Bcl-2 during the initial 12 hours post fertilization (hpf) and caused embryonic cell death. However, after 12 hours, simultaneous downregulation of p53 and Caspase-3 and exponential increase of Bcl-2, caused uncontrolled cell proliferation and prevented essential programmed cell death (PCD), ultimately resulting in significant (p,0.05) embryonic malformation up to 144 hpf. Evidences suggest that uncontrolled cell proliferation after 12 hpf may have been due to downregulation of p53 abundance, which in turn has an influence on upregulation of anti-apoptotic Bcl-2. Therefore, we have been able to
show for the first time and propose that hypoxia induced downregulation of p53 beyond 12 hpf, disrupts PCD and leads to failure in normal differentiation, causing malformation in gold fish embryos.
moisture, protein, lipid, carbohydrate, ash content and mineral composition of Indian shad, hilsa (T. ilisha) during upstream migration for spawning from off-shore of the Bay of Bengal to the Bhagirathi-Hooghly zones of the Ganga river system in India. Adult hilsa
fish were collected from seawater (SW), freshwater 1 (FW1) and freshwater 2 (FW2) locations, where the salinity level was 26-28‰, 1-5‰ and 0-0.04‰ respectively. The moisture and carbohydrate varied significantly among three locations, but not the protein and ash contents. The moisture content of hilsa collected from different habitats ranged between 62.40% and 68.71%, whereas, the protein, lipid, carbohydrate and ash percentages were 15.22%, 12.61%, 0.84%, 2.59% and 15.59%, 14.35%, 3.85%, 3.78% in seawater and freshwater respectively. The minerals like sodium, potassium and calcium
were highest in SW hilsa compared to FW hilsa. However, iron content was highest in FW hilsa compared to SW hilsa. The results indicate that the migration influences the nutritive value of hilsa, as the lipid, sodium, potassium and calcium levels significantly reduced during upstream river migration. It further, point out that the lipid and carbohydrate
mobilized as the energy source to support long migration and gonadal development. The ionic profile of hilsa muscle showed location effects, and the values declined while the fish migrated through freshwater indicates that the energy driven metabolic processes might govern the acclimation of upstream migration and spawning of T. ilisha
incorporated through treated domestic sewage with varying dosages viz. 79.3 · 105 l ha1 and 67.7 · 105 l ha1 and water productivity in
a controlled carp culture system were assessed in comparison to those involved in a fertilized based one, with a view to correlate among
physical, chemical and biological processes involved in fish yield under the systems. The net water productivities were measured on the
basis of net return values (in Indian rupees; INR) from the carp production systems at a stocking density @ 5000 per ha with four species
combination. Selected relevant water parameters such as dissolved oxygen, total alkalinity, biochemical oxygen demand (BOD5) in sewage
effluent and fertilizer based systems were monitored along with certain biological parameters viz. gross primary productivity, fish
production and water productivity. The nutrient inputs in terms of total ammonia–nitrogen (TAN) in effluents, total nitrogen (TN)
in fertilizers and phosphorus (P2O5) in both effluents and fertilizers were found significantly correlated with biological production.
The results of the experiment revealed that the sewage incorporation at 79.3 · 105 l ha1 yielded similar gross fish production as recorded
from fertilizer based system, whereas net water productivity using sewage as nutrient source was found 64% higher than that of a fertilizer
based system.
study depicts hypoxia induced disruption of the intrinsic pathway of programmed cell death (PCD), leading to embryonic
malformation in the goldfish, Carrasius auratus. Constant hypoxia induced the early expression of pro-apoptotic/tumor suppressor p53 and concomitant expression of the cell death molecule, caspase-3, leading to high level of DNA damage and cell death in hypoxic embryos, as compared to normoxic ones. As a result, the former showed delayed 4 and 64 celled stages and a delay in appearance of epiboly stage. Expression of p53 efficiently switched off expression of the antiapoptotic Bcl-2 during the initial 12 hours post fertilization (hpf) and caused embryonic cell death. However, after 12 hours, simultaneous downregulation of p53 and Caspase-3 and exponential increase of Bcl-2, caused uncontrolled cell proliferation and prevented essential programmed cell death (PCD), ultimately resulting in significant (p,0.05) embryonic malformation up to 144 hpf. Evidences suggest that uncontrolled cell proliferation after 12 hpf may have been due to downregulation of p53 abundance, which in turn has an influence on upregulation of anti-apoptotic Bcl-2. Therefore, we have been able to
show for the first time and propose that hypoxia induced downregulation of p53 beyond 12 hpf, disrupts PCD and leads to failure in normal differentiation, causing malformation in gold fish embryos.
moisture, protein, lipid, carbohydrate, ash content and mineral composition of Indian shad, hilsa (T. ilisha) during upstream migration for spawning from off-shore of the Bay of Bengal to the Bhagirathi-Hooghly zones of the Ganga river system in India. Adult hilsa
fish were collected from seawater (SW), freshwater 1 (FW1) and freshwater 2 (FW2) locations, where the salinity level was 26-28‰, 1-5‰ and 0-0.04‰ respectively. The moisture and carbohydrate varied significantly among three locations, but not the protein and ash contents. The moisture content of hilsa collected from different habitats ranged between 62.40% and 68.71%, whereas, the protein, lipid, carbohydrate and ash percentages were 15.22%, 12.61%, 0.84%, 2.59% and 15.59%, 14.35%, 3.85%, 3.78% in seawater and freshwater respectively. The minerals like sodium, potassium and calcium
were highest in SW hilsa compared to FW hilsa. However, iron content was highest in FW hilsa compared to SW hilsa. The results indicate that the migration influences the nutritive value of hilsa, as the lipid, sodium, potassium and calcium levels significantly reduced during upstream river migration. It further, point out that the lipid and carbohydrate
mobilized as the energy source to support long migration and gonadal development. The ionic profile of hilsa muscle showed location effects, and the values declined while the fish migrated through freshwater indicates that the energy driven metabolic processes might govern the acclimation of upstream migration and spawning of T. ilisha