Population dynamics of the geographically defined metapopulations of brown shrimp Metapenaeus monoceros (Fabricius, 1798) from Indian waters
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Authors
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A. P. Dineshbabu
CMFRI
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P. T. Sarada
CAR-Central Marine Fisheries Research Institute, Regional Station, Chennai, Tamil Nadu
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G. Maheswarudu
ICAR-Central Marine Fisheries Research Institute, Kochi, Kerala
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S. Lakshmi Pillai
ICAR-Central Marine Fisheries Research Institute, Kochi, Kerala
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Gyanranjan Dash
ICAR-Central Marine Fisheries Research Institute, Field Centre, Puri, Odisha
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Indira Divipala
ICAR-Central Marine Fisheries Research Institute, Regional Centre, Visakhapatnam, Andhra Pradesh. 530 003.
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Rajan Kumar
ICAR-Central Marine Fisheries Research Institute, Regional Station, Veraval, Gujarat. 362 267
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Rekha Devi Chakraborty
ICAR-Central Marine Fisheries Research Institute, Kochi, Kerala.682018
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M. Rajkumar
ICAR-Central Marine Fisheries Research Institute, Regional Centre, Mandapam, Tamil Nadu. 623 520.
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J. Jayasankar
ICAR-Central Marine Fisheries Research Institute, Kochi, Kerala.682018
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R. Ratheeshkumar
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K. N. Saleela
ICAR-Central Marine Fisheries Research Institute, Regional Centre, Vizhinjam, Kerala, 695 521
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Rajendra Naik
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Josileen Jose
Abstract
Population dynamics of the brown shrimp Metapenaeus monoceros (Fabricius, 1798) was studied along the Indian coast using
catch and effort data of trawlers from 8 States and 2 Union Territories for the period 2007-2015. Classical length-based
stock assessment methods and spatial database of the shrimp catch were used to derive fishing ground related conclusions.
Inclusion of spatial data revealed the possibility of existence of metapopulations of M. monoceros in the region. Maximum
sustainable yield (MSY) cannot be a reasonable reference point for deciding the fishing pressure in M. monoceros. By
analysing stock fluctuations noticed during the study period with varying spawning stock biomass combinations, retention
of 40% spawning biomass seems to be a safe option for sustaining M. monoceros production from Indian waters. Based
on this, the study recommends reduction of fishing pressure along north-west, south-west and northeast coast by 70, 60 and
70% respectively from the base level of effort in 2017. The study illustrates that the spatial data from fishing ground, can
serve as an additional tool to derive management options. The study also emphasises the need for further investigations
on the possibilities of metapopulations of M. monoceros which is widely distributed in all agro-climatic zones along the Indian coast.
Keywords: Indian coast, Metapopulation, M. monoceros, Spatial study, Stock assessment