Trends in marine fish landings in India

S.S. Shastri

Abstract



From the available specieswise data for the last twenty years, statistical models for the prediction of marine fish landings have been attempted here using the orthogonal polynomial technique. Only the species or groups of fishes having an average production of more than 20 thousand tonnes have been considered. These averages were based on ten years period, i.e., from 1964-1973. The polynomial of fifth degree was taken into account for each of the 15 groups studied. On the basis of the results of the analysis of variance tables, fifth degree curves were fitted to 7 groups, viz., mackerel, other sardines, elasmobranchs, Leiognathus, ribbon fish, other clupeids and Anchoviella. Since higher degree curves were insignificant even at 10 percentile level. Fourth degree curves were fitted in the case of penaeid prawns, sciaenids and cat fishes, second degree for oil sardine and non penaeid prawns and only linear curves for Harpodon nechereus, Caranx and pomfrets. Higher values of explained variations (Leiognathus, maximum 91) indicate the closeness of fit. Majority of the species groups studied generally show an increasing reduction especially after 1966, with the exception of oil sardine and Harpodon nechereus, the former showing an increasing trend up to 1964-68 and then decreasing and the latter constantly decreasing level

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