Fishery, biology and population dynamics of Parapenaeopsis stylifera at Calicut

Sarada, P T (2002) Fishery, biology and population dynamics of Parapenaeopsis stylifera at Calicut. Indian Journal of Fisheries, 49 (4). pp. 351-360.

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Abstract

Results of the study based on the data collected at Calicut on the fishery and biology of Parapenaeopsis stylifera for a period of five years from 1987 to 1992 are given. The average annual catch and catch per unit effort were 306 tons and 16.6 kg respectively. The peak landings were observed during October -January. Shrimp formed 7.4% of the total trawl landings and 49.8% of the shrimp catch was contributed by P.stylifera. The size range of female was 46-130mm and in male, 51-110mm. Males outnumbered females in the total catch and the difference was statistically significant. Mature females occured throughout the season and the size at first maturity was 74.6 + 1.013 mm. The growth parameters, L00, k and t0 were 132.03 mm, 0.1912 and 0.088 respectively for feamles and 111.8 mm, 0.2065 and 0.398 respectively for males. Total average mortaility rate was 6.41 (females) and 9.83 (males). Yield per recruit and cohort analysis revealed that further increase in effort would affect the stock adversely.

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