Fishery, growth, mortality and exploitation status of Daysciaena albida (Cuvier, 1830) from Vembanad Lake, a Ramsar site on the southwest coast of India
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Authors
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C. R. Renjithkumar
Assistant Professor, Department of Fisheries and Aquaculture, St Alberts College (Autonomous) Ernakulam, Kerala
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K. Roshni
Postdoctoral Fellow, School of Environmental Studies, Cochin University of Science and Technology (CUSAT), Kochi-620222, Kerala, India
Abstract
The fishery, growth, mortality and exploitation status of Bengal corvina Daysciaena albida were investigated from the Vembanad Lake, the largest brackish Ramsar wetland in southern India. D. albida ranks as the fourth important finfish species fished from the lake contributing 3.79% of the total fish production. Our study aimed to analyse the fishery and demographic pattern of D. albida to facilitate the formulation of fishery management options that enhance the livelihoods of artisanal fishermen. The estimated annual catch of D. albida from the Vembanad Lake was 10.84 t The length-weight relationship (LWR) was derived as W = 0.032 TL2.94 (r2 =0.98; SE=0.072). Growth parameters for the species were recorded as - asymptotic length (Lα) = 47.25 cm and growth coefficient (K) = 0.98 y−1. The natural mortality (M) was estimated at 0.83 y−1, and fishing mortality (F) was 1.13 y−1. The exploitation level (E) was calculated to be 0.58 which surpassed the optimum value (E50), indicating overfishing. To safeguard the species from depletion, it is imperative to put in place management strategies, such as regulating mesh sizes, establishing closed fishing seasons, reduction of fishing effort and enforcing catch quotas for fishers.
Keywords: Bengal corvina, LWR, Management, Overexploitation, Small-scale fishery
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