Abstract

A generic type age-structured fishery population model consisting of two harvestable age classes is formulated. Optimal harvest rates are determined with uniform fishing mortality and perfectly selective fishing, respectively. Selectivity allows for differentiating the fishing mortality among different age classes. Sustainable yield-biomass functions are developed, and the maximum sustainable yield (MSY) solutions are found under both exploitation schemes. The gain of perfectly selective fishing over uniform (or biomass) fishing is examined under various assumptions, and it is proved that the benefit of selective harvesting increases when the harvestable fish population becomes more heterogeneous in terms of weights, or values. In contrast to the surplus production model, or Clark model, the analysis also demonstrates that MSY with different age classes is not purely a biological concept.

Keywords

Fishery economics; age-structured model; biomass harvesting; perfect fishing selectivity

Published in

Natural Resource Modeling
2016, Volume: 29, number: 4, pages: 610-632
Publisher: WILEY-BLACKWELL

SLU Authors

• Gong, Peichen

  • Department of Forest Economics, Swedish University of Agricultural Sciences
    

Sustainable Development Goals

Conserve and sustainably use the oceans, seas and marine resources for sustainable development


UKÄ Subject classification

Fish and Wildlife Management
Economics


Publication identifier

DOI: https://doi.org/10.1111/nrm.12118

Permanent link to this page (URI)

https://res.slu.se/id/publ/83220