सामुद्री जीवियों पर तापमान का प्रभाव

कृपया पूरा लेखा पढ

Inshore shrimps - Family, Genera and species of commercial importance in India

Crustaceans are important component of the marine ecosystem being food for several predatory fishes and are also valuable fishery resource in countries where they are fished on a commercial scale. Shrimps especially of the superfamily Penaeoidea (family Penaeidae) and Sergestoidea (family Sergestidae) are commercially exploited by different gears along the Indian coast from inshore waters. They contribute substantially to the crustacean landings of the country and the larger varieties - Fenneropenaeus indicus, F. merguiensis, F. pencillatus, Penaeus monodon and Penaeus semisulcatus are foreign exchange earners as they have good demand in the international market. Similarly Acetes spp. forms good fishery in the northwest and northeast coast of the country. They belong to the family Sergestidae and are small in size and usually dried or made into paste and used for local consumption and poultry/aquaculture feed preparation. Classification of organisms in an area is essential to estimate the quantum of biodiversity and make decisions on their management and conservation. Perez Farfante and Kensley (1997) have listed total of 401 species of shrimps of which 120 species have been recorded from Indian waters (inshore and deepsea together)

Fishery and biology of commercial penaeid shrimps

Marine shrimps are fished all along the Indian coast and brought to different fish landing centres/harbours located in the maritime states. They are caught mainly by trawlers, either multiday or single day trawlers using trawl nets. The multiday trawling operations may extend from three days to more than a week. The voyage by single day trawlers is restricted to 6 to 7 hours. There are several commercially important shrimp species in India– Penaeus indicus, Metapenaeus dobsoni, Metapenaeus monoceros, Metapenaeus affinis, Parapenaeopsis stylifera, Penaeus semisulcatus, Penaeus monodon, Solenocera choprai etc. In each maritime state, the species composition varies and one or the other species may dominate the landings in quantity. Some of them are highly valued in the international markets whereas others are utilised for domestic consumption. Certain smaller species are also dried and consumed. In India the total peaneid shrimp landings during 2016 was 200116 t forming 45% of the crustacean and 12% of the total marine landings. Diagnostic characters provide identity to each species and species having similar or certain identical characters are placed under same genus and family. Commercial shrimp species mostly belong to the family penaeidae, under the genera Penaeus, Metapenaeus, Parapenaeopsis, Metapenaeopsis, Solenocera and Trachypenaeus

स्टोमाटोपोड मात्स्यिकी संपदा एवं उनकी अहमियत

कृपया पूरा लेखा पढ

Inshore shrimps

Family penaeidae includes majority of the commercial marine shrimps. There are also few species of commercial importance belonging to the families Solenoceridae, Sergestidae and Carideae. They are commercially exploited mostly by single and multiday trawlers. Major commercial coastal species are Penaeus indicus, Penaeus monodon, Metapenaeus dobsoni, Penaeus semisulcatus, Metapenaeus monocoeros, Metapenaeus affinis, Penaeus canaliculatus, Penaeus japonicus, Penaeus pencillatus, Penaeus merguiensis and Parapenaeopsis stylifera. Besides species belonging to genera Metapenaeopsis, Trachysalambria and Solenocera also form minor fishery in some maritime states. The juveniles except P. stylifera are caught from estuaries/backwaters using stakenets, bagnets etc. along with other fishes. They complete their life cycle in two phases- in the sea and in the estuaries/backwaters. They move to the sea from the estuaries to spawn. P. stylifera are stenohaline and complete their life cycle in the sea

Fishery of stomatopods - an undervalued and unappreciated fishery resource off Chennai

Stomatopods are a neglected fishery resource among the crustaceans, though it is a common bycatch in trawl fishing. They are commercially exploited in certain countries, but in India, they find market only as a raw material for preparation of fish meal and poultry feed. In Japan, Orataria orataria (de Haan, 1844) and in mediterranean countries, Squilla mantis (Linnaeus, 1758) form a good fishery and are relished as human food

Rediscovery of the deep sea shrimp Glyphocrangon investigatoris Wood- Mason and Alcock, 1891 from Indian waters

Details on the deep sea shrimp Glyphocrangon investigatoris caught off Nagapattinam and landed at Chennai Fisheries Harbour is reported here. This species was first recorded by the Investigator expedition from Bay of Bengal and later from Porto Novo. This is the first record from regular trawl fishery. As the species is reported here more than a century after its first description from India, the distinct morphological features is presented along with the colour photographs of the specimen

चेन्नई की समुद्री क्रस्टेशियाई संपदा

कृपया पूरा लेखा पढ

Fishery, biology and yield estimates of Portunus sanguinolentus off Chennai

The fishery and stock characteristics of the dominant species of crab, Portunus sanguinolentus was studied along the Chennai coast. The annual crab landings during the period 1998-2007 ranged from 236 t to 1,628 t with the catch rate fluctuating between 0.78 kg/h and 2.01 kg/h. The carapace width of P. sanguinolentus in the fishery was 41-165 mm for females and 41-155 mm for males. Females were dominant throughout the period of study, the overall sex ratio 1:1.41

Large-sized stomatopod Lysiosquilla tredecimdentata from north Tamil Nadu coast

On 6th June 2006, a large-sized stomatopod measuring 278 mm in total length was obtained from the trawl catches landed at Cuddalore Fisheries Harbour. It was identified as Lysiosquilla tredecimdentata belonging to the family Lysiosquillidae