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Modeling the impacts of fishing regulations in a tropical Indian estuary using Ecopath with Ecosim approach

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  • G. B. Sreekanth

    (ICAR-Central Coastal Agricultural Research Institute)

  • S. K. Chakraborty

    (ICAR-Central Institute of Fisheries Education)

  • A. K. Jaiswar

    (ICAR-Central Institute of Fisheries Education)

  • P. U. Zacharia

    (ICAR-Central Marine Fisheries Research Institute)

  • K. S. Mohamed

    (ICAR-Central Marine Fisheries Research Institute)

Abstract

In this study, we measured the impacts of an effective fishing regulation on the sustainability of fisheries in Zuari estuary, a tropical estuary situated along western coast of India through an Ecosim approach. Ecosystem indicators for 2016 and 2031 (for each Ecosim scenario) were measured to compare and contrast the decadal changes in the status of the ecosystem between these two periods. Four different hypothetical fishing patterns were simulated to explore the best suited management scenario. The ecosystem indices of 2031 ecosystem were compared with that obtained for 2016 to evaluate the possible effects of fishing regulations. The functional groups showed a decline in their biomass when no fishing regulations are implemented (S1). The direct fishing effort reductions of all the fleets (S4) and ban/reduction of indiscriminate fishing fleets (S2-immediate ban and S3-gradual reduction) showed a more or less similar trend for recovery of fish stocks through diverse fisheries policies. A complete ban of indiscriminate fishing seems to slightly more advantageous than the direct reductions in the fishing effort for all the fleets in terms of stock recovery (130%), Q statistic (1.15), Shannon diversity (1.43), mean trophic level of ecosystem (2.98), mean trophic level of the catch (2.91) and fish catch in the gillnet fleet (200%). The simulations have also suggested that a complete control for mechanized fishing fleets will be the best possible management strategy for the recovery of fish stocks in the ecosystem.

Suggested Citation

  • G. B. Sreekanth & S. K. Chakraborty & A. K. Jaiswar & P. U. Zacharia & K. S. Mohamed, 2021. "Modeling the impacts of fishing regulations in a tropical Indian estuary using Ecopath with Ecosim approach," Environment, Development and Sustainability: A Multidisciplinary Approach to the Theory and Practice of Sustainable Development, Springer, vol. 23(12), pages 17745-17763, December.
    • Handle: RePEc:spr:endesu:v:23:y:2021:i:12:d:10.1007_s10668-021-01410-3
    DOI: 10.1007/s10668-021-01410-3
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    References listed on IDEAS

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    2. Heymans, Johanna Jacomina & Coll, Marta & Link, Jason S. & Mackinson, Steven & Steenbeek, Jeroen & Walters, Carl & Christensen, Villy, 2016. "Best practice in Ecopath with Ecosim food-web models for ecosystem-based management," Ecological Modelling, Elsevier, vol. 331(C), pages 173-184.
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