Vaibhav Mhatre - Academia.edu (original) (raw)

Papers by Vaibhav Mhatre

Indian Journal of Fisheries

Seasonal variations in phytoplankton species and abundance along the coast of Maharashtra from tw... more Seasonal variations in phytoplankton species and abundance along the coast of Maharashtra from two different locations (Mumbai and Ratnagiri) and depths were investigated during August 2014-May 2017. A total of 84 species of phytoplankton were recorded from the region out of which 67 were diatoms, 16 dinoflagellates and one blue green alga. Seventy-five and 60 species of phytoplankton were recorded from Ratnagiri and Mumbai respectively. Diatoms dominated the phytoplankton community (81.7-93.3%) followed by dinoflagellates (4.7-7.2%) and blue green algae in both locations. Maximum phytoplankton density was recorded during post-monsoon season followed by pre-monsoon and monsoon seasons at Mumbai and Ratnagiri. Highest average phytoplankton cell density recorded was 9.09 x 104 cells l-1 and 4.06 x 104 cells l-1 during post-monsoon season at Ratnagiri and Mumbai respectively. Maximum cell density was observed at 20 m depth from Mumbai and Ratnagiri. Thalassiosira subtilis, Trieres mobi...

Indian Journal of Geo-Marine Sciences, 2018

Present study consists rare batoids from north-eastern Arabian Sea. A specimen of Dasyatis microp... more Present study consists rare batoids from north-eastern Arabian Sea. A specimen of Dasyatis microps (101.0 cm DW) and Pteroplatytrygon violacea (49.5 cm DW) respectively were collected in a trawler, operating south off Mumbai in the Arabian Sea, north-west coast of India. The present record of these elasmobranchs from the northern Arabian Sea shows their extended range of occurrence around the Indian coast, which is earlier reported from south-east and south-west coast of India. The morphometric measurements of the specimens collected were compared with previous records. In the same fishing area, pregnant Rhynchobatus djiddensis (254.0 cm TL) and a juvenile R. djiddensis (44.0 cm TL) was also caught in shallow coastal waters at 40 m depth. Biological observations on Dasyatis microps and Rhynchobatus djiddensis also presented.

Div ersity and abundance of pelagic shark bycatch in the tuna longline operations in northern Ind... more Div ersity and abundance of pelagic shark bycatch in the tuna longline operations in northern Indian Ocean were examined for the period 2004-2010. During the survey 1.2 million hooks were deployed in three regions of seas around India resulting in the catch of 1501 numbers of sharks. Significant variations in the diversity and abundance of pelagic sharks were observed among the three regions of Indian seas. Catches of sharks are prominent in Andaman & Nicobar region contributing 35.15% of the catch by number and 51.46% by weight. In the eastern Arabian Sea, sharks constituted 15.49% and 14.89% of the total catch by number and weight respectively. In western Bay of Bengal, this group contributed 7.74% (by number) and 9.33% (by weight) to the total catch. Alopias pelagicus, Carcharhinus limbatus, Alopias superciliosus and Carcharhinus falciformis were the dominant species of pelagic sharks observed in the Indian seas. Time series analysis of hooking rates revealed drastic decline in t...

Journal of the Marine Biological Association of India

Journal of Coastal Research

Estimated bivalve landing of Maharashtra was 1,237 t in 2017. Oysters dominated the fishery (79%)... more Estimated bivalve landing of Maharashtra was 1,237 t in 2017. Oysters dominated the fishery (79%) followed by clams (17%) and mussel (4%). The Indian rock oyster, Saccostrea cucullata locally known as 'Kalva' contributed 90% to the oyster catch. The fishery was observed mainly in Sindhudurg and Ratnagiri Districts. Clam landing comprised of Meretrix meretrix (44%), M. casta (30%), Paphia malabarica (18%), Katelysia opima (7%) and Polymedosa erosa (1%). Green mussels (Perna viridis) were harvested along the coastal waters of Ratnagiri. Meretrix meretrix showed dominance in all month followed by M. casta and P. malabarica. Catch per unit efforts for clams and oyster were highest during June and July month. There was good demand for bivalves in local markets during the mechanised fishing ban period. Mostly women were handpicking the clams during low tide. There was good demand for bivalves in local markets during the mechanised fishing ban period (June-July). The correlation matrix shows condition index and percentage edibility correlated with the water temperature in the creek.

Turkish Journal of Fisheries and Aquatic Sciences

Distribution, abundance and biology of swordfish, Xiphias gladius, of the Indian seas were invest... more Distribution, abundance and biology of swordfish, Xiphias gladius, of the Indian seas were investigated by analyzing the data gathered during tuna longline surveys conducted by the Fishery Survey of India (FSI). Study undertaken during the period from 2004 to 2010 revealed swordfish Catch Per Unit Effort of 0.02 numbers in 100 hooks from the Arabian Sea; 0.01 from Bay of Bengal and 0.02 form the Andaman and Nicobar waters. About 16% of the specimens caught were juveniles and the sex ratio of smaller fishes was in favour of males, whereas, larger specimens were mostly females. Length-weight relationship established indicated slightly positive allometric growth of the species and length based models revealed difference in growth between sexes. The growth parameters estimated for females were: asymptotic length (L∞) = 311.11 cm, growth coefficient (K) = 0.17/yr and age at zero length (t0 ) = –0.53 yr, whereas, the growth parameters estimated for males were: L∞ = 243.79 cm, K = 0.22/yr ...

Indian Journal of Fisheries

Seasonal variations in phytoplankton species and abundance along the coast of Maharashtra from tw... more Seasonal variations in phytoplankton species and abundance along the coast of Maharashtra from two different locations (Mumbai and Ratnagiri) and depths were investigated during August 2014-May 2017. A total of 84 species of phytoplankton were recorded from the region out of which 67 were diatoms, 16 dinoflagellates and one blue green alga. Seventy-five and 60 species of phytoplankton were recorded from Ratnagiri and Mumbai respectively. Diatoms dominated the phytoplankton community (81.7-93.3%) followed by dinoflagellates (4.7-7.2%) and blue green algae in both locations. Maximum phytoplankton density was recorded during post-monsoon season followed by pre-monsoon and monsoon seasons at Mumbai and Ratnagiri. Highest average phytoplankton cell density recorded was 9.09 x 104 cells l-1 and 4.06 x 104 cells l-1 during post-monsoon season at Ratnagiri and Mumbai respectively. Maximum cell density was observed at 20 m depth from Mumbai and Ratnagiri. Thalassiosira subtilis, Trieres mobi...

Indian Journal of Geo-Marine Sciences, 2018

Present study consists rare batoids from north-eastern Arabian Sea. A specimen of Dasyatis microp... more Present study consists rare batoids from north-eastern Arabian Sea. A specimen of Dasyatis microps (101.0 cm DW) and Pteroplatytrygon violacea (49.5 cm DW) respectively were collected in a trawler, operating south off Mumbai in the Arabian Sea, north-west coast of India. The present record of these elasmobranchs from the northern Arabian Sea shows their extended range of occurrence around the Indian coast, which is earlier reported from south-east and south-west coast of India. The morphometric measurements of the specimens collected were compared with previous records. In the same fishing area, pregnant Rhynchobatus djiddensis (254.0 cm TL) and a juvenile R. djiddensis (44.0 cm TL) was also caught in shallow coastal waters at 40 m depth. Biological observations on Dasyatis microps and Rhynchobatus djiddensis also presented.

Div ersity and abundance of pelagic shark bycatch in the tuna longline operations in northern Ind... more Div ersity and abundance of pelagic shark bycatch in the tuna longline operations in northern Indian Ocean were examined for the period 2004-2010. During the survey 1.2 million hooks were deployed in three regions of seas around India resulting in the catch of 1501 numbers of sharks. Significant variations in the diversity and abundance of pelagic sharks were observed among the three regions of Indian seas. Catches of sharks are prominent in Andaman & Nicobar region contributing 35.15% of the catch by number and 51.46% by weight. In the eastern Arabian Sea, sharks constituted 15.49% and 14.89% of the total catch by number and weight respectively. In western Bay of Bengal, this group contributed 7.74% (by number) and 9.33% (by weight) to the total catch. Alopias pelagicus, Carcharhinus limbatus, Alopias superciliosus and Carcharhinus falciformis were the dominant species of pelagic sharks observed in the Indian seas. Time series analysis of hooking rates revealed drastic decline in t...

Journal of the Marine Biological Association of India

Journal of Coastal Research

Estimated bivalve landing of Maharashtra was 1,237 t in 2017. Oysters dominated the fishery (79%)... more Estimated bivalve landing of Maharashtra was 1,237 t in 2017. Oysters dominated the fishery (79%) followed by clams (17%) and mussel (4%). The Indian rock oyster, Saccostrea cucullata locally known as 'Kalva' contributed 90% to the oyster catch. The fishery was observed mainly in Sindhudurg and Ratnagiri Districts. Clam landing comprised of Meretrix meretrix (44%), M. casta (30%), Paphia malabarica (18%), Katelysia opima (7%) and Polymedosa erosa (1%). Green mussels (Perna viridis) were harvested along the coastal waters of Ratnagiri. Meretrix meretrix showed dominance in all month followed by M. casta and P. malabarica. Catch per unit efforts for clams and oyster were highest during June and July month. There was good demand for bivalves in local markets during the mechanised fishing ban period. Mostly women were handpicking the clams during low tide. There was good demand for bivalves in local markets during the mechanised fishing ban period (June-July). The correlation matrix shows condition index and percentage edibility correlated with the water temperature in the creek.

Turkish Journal of Fisheries and Aquatic Sciences

Distribution, abundance and biology of swordfish, Xiphias gladius, of the Indian seas were invest... more Distribution, abundance and biology of swordfish, Xiphias gladius, of the Indian seas were investigated by analyzing the data gathered during tuna longline surveys conducted by the Fishery Survey of India (FSI). Study undertaken during the period from 2004 to 2010 revealed swordfish Catch Per Unit Effort of 0.02 numbers in 100 hooks from the Arabian Sea; 0.01 from Bay of Bengal and 0.02 form the Andaman and Nicobar waters. About 16% of the specimens caught were juveniles and the sex ratio of smaller fishes was in favour of males, whereas, larger specimens were mostly females. Length-weight relationship established indicated slightly positive allometric growth of the species and length based models revealed difference in growth between sexes. The growth parameters estimated for females were: asymptotic length (L∞) = 311.11 cm, growth coefficient (K) = 0.17/yr and age at zero length (t0 ) = –0.53 yr, whereas, the growth parameters estimated for males were: L∞ = 243.79 cm, K = 0.22/yr ...