ASSESSMENT OF SAURIDA TUMBIL (BLOCH) STOCK IN THE NORTHWEST CONTINENTAL SHELF WATER OF INDIA
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Authors
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D. K. GULATI
Central Institute of Fisheries Education, (Deemed University),
Versova, Mumbai - 400 061
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M. DEVARAJ
Central Institute of Fisheries Education, (Deemed University),
Versova, Mumbai - 400 061
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J. P. GEORGE
Central Institute of Fisheries Education, (Deemed University),
Versova, Mumbai - 400 061
Abstract
Based on the data collected from New Ferry Wharf, Sassoon Dock
and exploratory survey of MFV Saraswati on the Northwest coast of
India, the growth, mortality, population and stock parameters of
Saurida tumbil is reported in the present communication. The Von
Bertalanffy growth function (VBGF) parameters for growth on length
were found to beL== 49.8 em, K = 0.96/year, to= -.141 year. The length
at recruitment Or) is 80 mm. (tr = .167 year) while the length at first
capture (lc) for the commercial trawl fishery is 100 mm (tc = 0.25 year).
The annual fishing mortality coefficient (F) for 1983-85 was 0.43, the
natural mortality coefficient (M) was 1.33 and the exploitation ratio
(E) was 0.25. The yield per recruit (YIR) attained the maximum of 54.99
gat F = 1.091 forE = 0.45 for the present tc at 0.25 year. The annual
total stock (P) and standing stock (P) in the exploitation portion at the
inshore grounds to a depth of about 50 m were estimated to be 12,811
tons and 6,034 tons respectively. The average annual yield of 2,635
tons at the present F = 0.439 (E = 0.247) was less than the maximum
sustainable yield (MSY) for 3,331 tons attainable from the inshore
grounds at E = 0.45.
