Length-based assessment of penaeid shrimp fishery stocks along the north-eastern Arabian Sea

Rajan kumar; Gyanranjan Dash; P. T. Sarada; Shikha Rahangdale; Vinayakumar Vase; Vipul Solanki; Jayshree Gohel

doi:10.21077/ijf.2024.71.3.147045-01

Authors

Rajan Kumar Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India
Gyanranjan Dash Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India
P. T. Sarada Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India
Shikha Rahangdale Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India
Vinayakumar vase Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India
Vipul Solanki Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India
Jayshree Gohel Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

https://doi.org/10.21077/ijf.2024.71.3.147045-01

Abstract

Penaeid shrimps are a key resource in marine fisheries and are of great ecological and economic importance. The north-west (NW) coast of India contributes significantly (~30%) to the penaeid shrimp landings in India. Four species of penaeid shrimps, namely
Parapenaeopsis stylifera, Solenocera crassicornis, Metapenaeus affinis, and M. monoceros, were assessed using Length-based spawning potential ratio (SPR) based on the length frequency data collected during 2017-21, from commercial trawlers operating in the depth range of 20-100 m along the north-west coast of India bordering the north-eastern Arabian Sea. The current status (2021) of P. stylifera, S. crassicornis and M. affinis was found to be healthy, with a spawning potential ratio of ≥ 0.40. For M. monoceros, the SPR was slightly below 0.40 (0.34-35), however, considering the fast growth and short generation time for the resources, the stock status can be considered fair. Significant reduction in fishing pressure (F/M < 1.0) and increase in SPR (>0.40) during COVID-19 affected years (2020-21) were evident. The reduction in fishing hours during the pandemic has allowed the resource to regain the target reference point (TRP) for SPR. Declining catches over the past decade for the group are not due to resource depletion but for the shift in species preference and the diversification of trawls in the region, with bottom trawling giving way to pelagic trawling.

Keywords: Sustainability, Spawning potential ratio, COVID-19, Penaeid shrimps

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Author Biographies

Rajan Kumar, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

Scientist
Gyanranjan Dash, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

Senior Scientist
P. T. Sarada, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

Principal Scientist
Shikha Rahangdale, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

Scientist
Vinayakumar vase, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

Senior Scientist
Vipul Solanki, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

Technician
Jayshree Gohel, Indian Council of Agricultural Research-Central Marine Fisheries Research Institute, Kochi-682018, India

Technician

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