Shark resources of India, with notes on biology of a few species

The annual production of elasmobranchs in India during 1982-83 to 1984-85 period was around 59,000 t, of which sharks accounted for 37500 t (64%). Tamil Nadu, Gujarat, Maharashtra and Kerala together take the bulk of the catch. Of the 65 species reported from Indian waters, over 20 species (families Carcharhinidae and Sphymidae) contribute to the fishery. Feeding and breeding habits, intra-uterine embryos and growth characteristics of a few species are described here

Preliminary studies on the cephalopods collected from the Deep Scattering Layers of the Indian Exclusive Economic Zone and adjacent seas

Results of the preliminary studies on the cephalopods collected from the operation of Isaacs - Kidd Mid water Trawl net in the Deep Scattering Layers of the Indian Exclusive Economic Zone and adjacent seas during the cruises 1-15 of FORV Sagar Sampada are presented in this paper. Spatial, monthly and seasonal distributions of cephalopod biomass and its abundance in the DSL have been discussed. Differences in the biomass during day and night periods are also given

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का विषींजम अनुसंधान केंद्र

केंद्रीय समुद्री मात्स्यिकी अनुसंधान संस्थान का विषींजम अनुसंधान केंद्

Exploratory trawl fishing in Bombay - Saurashtra Waters during 1968-70

The paper deals with the exploratory trawl fishing conducted in Bombay- Saurashtra waters by the Bombay-based vessels of the now Exploratory Fisheries Project, Government of India, during 1968-70. The detailed study is based on the trawling data in respect of M. T. KALYANI IV and M. T. KALYANI V, as tlKse vessels have done extensive fishing, covering larger number of areas frwn Goa to Dwaraka, used the same type of gear and have identical specifications. The areawise abundance and seasonal distribution of 10 categories of fishes in 8 major areas, where a fishing effort of more than 100 h each was expended, are examined. The monthly variation in abundance and depthwise distribution of 5 groups of quality fishes in two most intensively fished areas (18-72 and 19-71) and in one area (22-68) rich in these fishes are studied. The results of these studies are compared with, and discussed in the light of the earlier findings

Hand-jigging for cuttlefish at Vizhinjam with a note on modern squid jigging

At Vizhinjam on the southwest coast of India almost the entire catch of the cuttlefish Sepia pharaonis is taken in a modified typeof hooks, the hand-jigs. The hand-jig consists mainly of a small iron rod with tires of hooks and a long monofilament line. The baited jig is operated on the sea bottom from a catamaran and normally one cuttlefish is taken per haul. A brief note on the modern squid jigging as practised in Japan is also given

The cephalopod fishery at Cochin, Kerala

The Cochin Fisheries Harbour is a major fish landing centre in Kerala. Cephalopod landings at this centre contribute about 11-23% of Kerala's annual cephalopod catch. They are landed as bycatch by shrimp trawlers which operate off Cochin upto 60 m depth. On an average, about 200 trawlers of 8-13m length range operate every day from Cochin base

Age and growth of the yellow dog shark Scoliodon laticaudus Muller and Henle from Bombay waters

The age and growth of the shark Scoliodon laticaudus Muller and Henle [(= S.sonakowah (Cuvier) ] from Bombay waters have been studied by the length frequency method. The shark, which measures about 140 mm at birth, attains 260, 380,470, 530 and 590 mm at the end of 1, 2, 3, 4, and 5 years respectively after birth. There is no difference in the growth rates of males and females. The females grow to a larger size and to an older age than the males. The growth is more or less slow as in the case of other sharks. The von Bertalanffy growth equation has been fitted to the observed values, for which the parameters calculated were K (on an annual basis) = 0.2731, L o^ = 755.23 mm and to =• -.5664 years. The length-at-age thus calculated agreed fairly closely with the observed values. The maximum length of this shark in Bombay waters is about 660 mm. Over 75 per cent of the landings were in the age group of 2-4 years ranging from 380 to 530 mm in total length

Culture of the brown mussel Perna indica at Vizhinjam, Southwest coast of India

The brown mussel Perna indica is found to be abundant in the inter tidal rocky area from Vizhinjam to Cape Comorin on the southwest coast of India. Results of culture experiments conducted at Vizhinjam during 1976-1979 period is summarized with details on environmental features of mussel farm, method of brown mussel culture on rope, seeding seasons, growth rate, spawning periodicity, production rate and animal association. The average growth rate of cultured mussels in the bay was 2.92 mm/month. Experiments on culture in the open sea have shown a faster growth rate of 5 mm/month. Spawning of P. indica begins by May and lasts till September with peak during July to August. Natural settlement of spat was noticed from July and the peak period of settlement was September-October. Production rate was estimated as 150 tonnes per hectare area for brown mussel. The average yield per metre length of rope was 12 kg

Fishery and biology of the brown mussel, Perna indica Kuriakose & Nair

On the culture ropes in the Vizhinjam Bay brown mussel show an average growth rate of 35 mm per year. In the open sea, mussels on ropes grow to 25 mm in 5 months. The weight increase is 9.29 g/annum in the bay and 9.72 g for 5 months in open sea. The condition index is maximum in August (i.e. before spawning). The spawning lasts from May to September, with a peak in - August

Instances of regeneration in the cuttlefish Sepia pharaonis Ehrenberg and in the squid Loligo duvaucelii Orbigny from Indian waters

Instances of regeneration of the first, third and fourth right arms and both the tentacles of a cuttlefish Sepia pharaonis, caught off Waltair, the left tentacle of a cuttlefish of the same species, and the third and fourth right arms and both the tentacles of a squid Loligo duvaucelii collected at Vizhinjam are dealt with