Multispecies virtual population analysis

Bharti, Vivekanand (2017) Multispecies virtual population analysis. In: Course Manual Summer School on Advanced Methods for Fish Stock Assessment and Fisheries Management. Lecture Note Series No. 2/2017 . CMFRI; Kochi, Kochi, pp. 238-245.

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Abstract

Fisheries are the major driver for the changing in properties of both fished and unfished species, through direct and indirect effects. Direct effects can include reductions in population abundance, age and size structure, biodiversity, community composition and habitat destruction. Indirect effects, including incidental mortality, are transmitted through the ecosystem by trophic interactions and competition, and may result in increased or decreased abundance of prey or predator species, altering community composition. In recognition of the complex, interconnected nature of marine ecosystems, ecosystem approaches have been promoted as a way to improve fisheries assessment and management. There is a widerange of multi-species and ecosystem modelling approaches. They range from extended single species models to multi-species minimum realistic models, food web models to whole ecosystem models with age and spatial structure. All models have their strengths and weaknesses: simplicity may entail missing key processes, whereas complexity requires more data, time and resources.

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