Stock assessment of the Indian squid Uroteuthis (Photololigo) duvaucelii off north Tamil Nadu coa... more Stock assessment of the Indian squid Uroteuthis (Photololigo) duvaucelii off north Tamil Nadu coast from commercial trawl landings was studied during the period 2012-2016. The species is mainly caught by trawl net and the annual average landing of the species was 563.3 t contributing to 2 % to the total trawl landing along north Tamil Nadu coast. L∞, K and t 0 were estimated as 260 mm, 0.84 yr-1 and-0.105 yr, respectively. Total mortality rate (Z), Natural mortality rate (M), and Fishing mortality rate (F) were 4.43 yr-1 , 1.67 yr-1 and 2.78 yr-1 , respectively. t max was estimated to be 3.47 yr. The length at first capture (Lc 50 = 62 mm) estimated by Length converted catch curve method was found to be lower than Length at first maturity (Lm 50 = 80 mm). Furthermore, E curr (current exploitation rate) was found be on higher side than the E max (0.48) and E 0.1 (0.40) which indicates that the fishery is in overexploited stage. Thompson and Bell prediction model showed that a marginal decrease (20 %) in current level of exploitation would help in regeneration of stock for long term sustainability of the resources as well as in achieving maximized economic return.
The yellow-striped sandlance, Bleekeria kallolepis Günther, 1862, is a poorly known ammodytid fis... more The yellow-striped sandlance, Bleekeria kallolepis Günther, 1862, is a poorly known ammodytid fish from the eastern Indian Ocean, known from fewer than five specimens. No detailed description or colour images of B. kallolepis have previously been available. We hereby provide a short taxonomic account of the species from its type locality Chennai, India with morphometrics and colour description.
Central Marine Fisheries Research Institute eBooks, 2017
Non-detriment Findings for the export of shark and ray species iii FOREWORD CITES (Convention on ... more Non-detriment Findings for the export of shark and ray species iii FOREWORD CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) is an international agreement between governments, which aims at the sustainability of wild exploited fauna/flora and ensures that international trade in specimens of wild animals and plants does not threaten their survival. 183 Parties have voluntarily joined CITES in an effort to sustain its resources. Since the trade in wild animals and plants crosses borders between countries, the effort to regulate it requires international cooperation to safeguard certain species from over-exploitation. Five species of sharks and two manta rays were added to Appendix II at Bangkok (Thailand), CITES CoP16 in 2013, effective from 14 September 2014. The list includes the scalloped hammerhead shark Sphyrna lewini, great hammerhead shark Sphyrna mokarran, smooth hammerhead shark Sphyrna zygaena, oceanic whitetip shark Carcharhinus longimanus, porbeagle shark Lamna nasus, giant manta ray Manta birostris and reef manta ray Manta alfredi. Although CITES is legally binding on the Parties, it does not take the place of national laws; rather it provides a framework to be respected by each Party, which has to adopt its own domestic legislation to ensure that CITES is implemented at the national level. Decisions on the extent of trade regulation are usually based on the recommendation of a Non-Detriment Findings study made by a competent Scientific Authority to assess the extent to which the survival of the species would be affected by the trade.
The Indian halibut Psettodes erumei (Bloch &Schneider, 1801) is a typical tropical bottom dwellin... more The Indian halibut Psettodes erumei (Bloch &Schneider, 1801) is a typical tropical bottom dwelling, piscivorous marine flat fish distributed all along the coastal waters of India (5-50 fathoms). It is a highly valued table-fish with high white meat yield for fillet. The meat yield (%) is known to vary between 42-49%, which is comparable to some of the best white meat fish species cultivated globally. The fish is locally called as Hario (Gujarati), Bhakus/ zipli (Marathi), Boxlep (Konkani), Ayirampalli (Malayalam), Erumeinakku (Tamil) and Norunalaka (Telugu). It is also called the 'Australian Halibut' and 'Pazifischer steinbutt' in international markets. There is a huge demand for flat fish in U.S/ Europe/ Japan. A lot of development has taken place in temperate and Mediterranean countries like Norway, Spain, France and Israel in domestic rearing and large scale aquaculture of temperate halibut and sub-temperate turbots. Attempts to domesticate this species in India are now being made in CMFRI's Kovalam Field Laboratory to establish a viable rearing technology and supplement the falling production of this commodity in the wild.
The present study reports observations of 13 giant freshwater whipray (Urogymnus polylepis) from ... more The present study reports observations of 13 giant freshwater whipray (Urogymnus polylepis) from commercial fish landings along the north‐east coast of India and updates existing records based on field observations and local social media reports. The disc width of the landed specimens ranged from 120 to 223 cm and they weighed 95–300 kg. All 13 specimens observed were mature (nine females and four males) and three females were pregnant, with embryo numbers ranging between 4 and 15. Globally, U. polylepis is listed as ‘Endangered’, and greater protection measures are needed in India to assist in reversing current population declines.
Biological information was collected from 214 individuals of the broadfin shark Lamiopsis temminc... more Biological information was collected from 214 individuals of the broadfin shark Lamiopsis temminckii measuring 418 to 1782 mm total length, LT . Size at maturity (L50 ) for females and males was estimated at 1430 and 1368 mm LT , respectively, while mature and gravid females were observed from 1350 mm LT with litter sizes 2-8 and size at birth 418-650 mm LT . Analysis of stomach contents revealed a variety of prey, primarily crustaceans (54·0%), teleosts (42·7%) and cephalopods.
Stock assessment of the Indian squid Uroteuthis (Photololigo) duvaucelii off north Tamil Nadu coa... more Stock assessment of the Indian squid Uroteuthis (Photololigo) duvaucelii off north Tamil Nadu coast from commercial trawl landings was studied during the period 2012-2016. The species is mainly caught by trawl net and the annual average landing of the species was 563.3 t contributing to 2 % to the total trawl landing along north Tamil Nadu coast. L∞, K and t 0 were estimated as 260 mm, 0.84 yr-1 and-0.105 yr, respectively. Total mortality rate (Z), Natural mortality rate (M), and Fishing mortality rate (F) were 4.43 yr-1 , 1.67 yr-1 and 2.78 yr-1 , respectively. t max was estimated to be 3.47 yr. The length at first capture (Lc 50 = 62 mm) estimated by Length converted catch curve method was found to be lower than Length at first maturity (Lm 50 = 80 mm). Furthermore, E curr (current exploitation rate) was found be on higher side than the E max (0.48) and E 0.1 (0.40) which indicates that the fishery is in overexploited stage. Thompson and Bell prediction model showed that a marginal decrease (20 %) in current level of exploitation would help in regeneration of stock for long term sustainability of the resources as well as in achieving maximized economic return.
The yellow-striped sandlance, Bleekeria kallolepis Günther, 1862, is a poorly known ammodytid fis... more The yellow-striped sandlance, Bleekeria kallolepis Günther, 1862, is a poorly known ammodytid fish from the eastern Indian Ocean, known from fewer than five specimens. No detailed description or colour images of B. kallolepis have previously been available. We hereby provide a short taxonomic account of the species from its type locality Chennai, India with morphometrics and colour description.
Central Marine Fisheries Research Institute eBooks, 2017
Non-detriment Findings for the export of shark and ray species iii FOREWORD CITES (Convention on ... more Non-detriment Findings for the export of shark and ray species iii FOREWORD CITES (Convention on International Trade in Endangered Species of Wild Fauna and Flora) is an international agreement between governments, which aims at the sustainability of wild exploited fauna/flora and ensures that international trade in specimens of wild animals and plants does not threaten their survival. 183 Parties have voluntarily joined CITES in an effort to sustain its resources. Since the trade in wild animals and plants crosses borders between countries, the effort to regulate it requires international cooperation to safeguard certain species from over-exploitation. Five species of sharks and two manta rays were added to Appendix II at Bangkok (Thailand), CITES CoP16 in 2013, effective from 14 September 2014. The list includes the scalloped hammerhead shark Sphyrna lewini, great hammerhead shark Sphyrna mokarran, smooth hammerhead shark Sphyrna zygaena, oceanic whitetip shark Carcharhinus longimanus, porbeagle shark Lamna nasus, giant manta ray Manta birostris and reef manta ray Manta alfredi. Although CITES is legally binding on the Parties, it does not take the place of national laws; rather it provides a framework to be respected by each Party, which has to adopt its own domestic legislation to ensure that CITES is implemented at the national level. Decisions on the extent of trade regulation are usually based on the recommendation of a Non-Detriment Findings study made by a competent Scientific Authority to assess the extent to which the survival of the species would be affected by the trade.
The Indian halibut Psettodes erumei (Bloch &Schneider, 1801) is a typical tropical bottom dwellin... more The Indian halibut Psettodes erumei (Bloch &Schneider, 1801) is a typical tropical bottom dwelling, piscivorous marine flat fish distributed all along the coastal waters of India (5-50 fathoms). It is a highly valued table-fish with high white meat yield for fillet. The meat yield (%) is known to vary between 42-49%, which is comparable to some of the best white meat fish species cultivated globally. The fish is locally called as Hario (Gujarati), Bhakus/ zipli (Marathi), Boxlep (Konkani), Ayirampalli (Malayalam), Erumeinakku (Tamil) and Norunalaka (Telugu). It is also called the 'Australian Halibut' and 'Pazifischer steinbutt' in international markets. There is a huge demand for flat fish in U.S/ Europe/ Japan. A lot of development has taken place in temperate and Mediterranean countries like Norway, Spain, France and Israel in domestic rearing and large scale aquaculture of temperate halibut and sub-temperate turbots. Attempts to domesticate this species in India are now being made in CMFRI's Kovalam Field Laboratory to establish a viable rearing technology and supplement the falling production of this commodity in the wild.
The present study reports observations of 13 giant freshwater whipray (Urogymnus polylepis) from ... more The present study reports observations of 13 giant freshwater whipray (Urogymnus polylepis) from commercial fish landings along the north‐east coast of India and updates existing records based on field observations and local social media reports. The disc width of the landed specimens ranged from 120 to 223 cm and they weighed 95–300 kg. All 13 specimens observed were mature (nine females and four males) and three females were pregnant, with embryo numbers ranging between 4 and 15. Globally, U. polylepis is listed as ‘Endangered’, and greater protection measures are needed in India to assist in reversing current population declines.
Biological information was collected from 214 individuals of the broadfin shark Lamiopsis temminc... more Biological information was collected from 214 individuals of the broadfin shark Lamiopsis temminckii measuring 418 to 1782 mm total length, LT . Size at maturity (L50 ) for females and males was estimated at 1430 and 1368 mm LT , respectively, while mature and gravid females were observed from 1350 mm LT with litter sizes 2-8 and size at birth 418-650 mm LT . Analysis of stomach contents revealed a variety of prey, primarily crustaceans (54·0%), teleosts (42·7%) and cephalopods.
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