Acetes as a Keystone Species in the Fishery and Trophic Ecosystem Along Northeastern Arabian Sea

Autor: D. Divu, Shikha Rahangdale, Vinaya Kumar Vase, Mohammed Koya, Rajesh Kumar Pradhan, Kapil Sukhdhane, Abdul Azeez, Rajan Kumar, Swatipriyankasen Dash, Gyanaranjan Dash, K. R. Sreenath, K. G. Jayshree
Rok vydání: 2021
Předmět:
Zdroj: Thalassas: An International Journal of Marine Sciences. 37:367-377
ISSN: 2366-1674
0212-5919
DOI: 10.1007/s41208-020-00276-y
Popis: Diet composition of nine commercially exploited fishery resources which contributes 55–60% of the total fish landings in the northwest coast of India were analyzed in this study. Gut content analysis of the selected fish groups has shown significant variations in the prey composition and predator preference on a prey item. The diet matrix revealed Acetes sp. (32.74%) as a key and common shared prey item, followed by mesopelagic fishes (30.51%), other shrimps (11.00%), digested material (7.42%), crabs (4.03%) and cephalopods (2.77%), etc. In this study, Acetes sp was considered as a proxy for the non-penaeid prawns due to its significant contribution (92%) to the total non-penaeid landings. Targeted exploitation of Acetes sp. has intensified recently (from 0.44 lakh t in 2004 to 1.40 lakh t in 2018) with an average annual growth rate of 11.2% due to the demand from fish meal plants. By considering its ecological and fishery importance, Acetes sp. should be considered as keystone species in the ecosystem. The Schaefer surplus production model was used to calculate the Biological Reference Points (BRPs) and model parameters MSY, FMSY, r, EMSY, and K. The model fit was fair (R2 = 0.630) and significantly positive correlation was observed between CPUEobserved and CPUEmodel. The estimated optimum exploitation limits (p
Databáze: OpenAIRE
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