Fishery, population dynamics and stock status of Jinga shrimp, Metapenaeus affinis (Milne-Edwards, 1837) from Gujarat waters of India

Dash, Gyanaranjan and Koya, Mohammed and Dash, Swatipriyanka Sen and Sreenath, K R and Vase, Vinay Kumar and Pradhan, Rajesh Kumar and Sukhdhane, Kapil S and Divu, D and Solanki, Vipul and Maheswarudu, G (2018) Fishery, population dynamics and stock status of Jinga shrimp, Metapenaeus affinis (Milne-Edwards, 1837) from Gujarat waters of India. Indian Journal of Geo-Marine Sciences (IJMS), 47 (11). pp. 2267-2277.

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Abstract

The life history parameters and stock status of Jinga shrimp, Metapenaeus affinis was assessed by collecting length frequency, catch and effort data for the species during January 2012 to December 2015 from the commercial trawlers operating from Veraval fish landing centres in Gujarat. Growth parameters i.e., L∞, K and t0 were estimated as 185.5 mm, 1.9 yr-1 and -0.001 yr, respectively for male and 204.75 mm, 1.7 yr-1 and -0.001 yr, respectively for the female Metapenaeus affinis. The growth performance of female was found to be higher than male shrimp. Mortality parameters i.e., Z, M and F estimated were 8.37 yr-1, 2.926 yr-1, 5.45 yr-1 for male and 6.76 yr-1, 2.61 yr-1and 4.15 yr-1 for females, respectively. Current exploitation ratio (Ecur) for the male was found to be higher than that of the female shrimp. Length at capture (LC50) for shrimp was higher than the length at maturity (LM50). Relative yield per recruit (Y/R’) model projected the Emax of 0.75 for the species, which implies that the current exploitation (Ecur) could be increased to maximize the yield. Thompson and Bell bio-economic model indicates that an increase of current fishing level by 5.2 and 3.8 times could maximize the yield (MSY) for male and female shrimp respectively. However, this increase could decimate the virgin spawning stock biomass (SSB0) to 12 and 15% that could be dangerous for stock regeneration. Considering the high resilient nature of the species, the current fishing pressure could be increased by 1.8 times while maintaining the biomass at a comparatively safer level of 25%.

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