Evaluating the Bio-economic Performance of the Northern Shelf Haddock (Melanogrammus aeglefinus) Fishery Using Age-structured Harvesting Strategies and Variable Growth Trajectories Public Deposited

http://ir.library.oregonstate.edu/concern/conference_proceedings_or_journals/0c483m36w

Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, held July 11-15, 2016 at Aberdeen Exhibition and Conference Center (AECC), Aberdeen, Scotland, UK.

Suggested Bibliographic Reference: Challenging New Frontiers in the Global Seafood Sector: Proceedings of the Eighteenth Biennial Conference of the International Institute of Fisheries Economics and Trade, July 11-15, 2016. Compiled by Stefani J. Evers and Ann L. Shriver. International Institute of Fisheries Economics and Trade (IIFET), Corvallis, 2016.

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  • One way to evaluate the bio-economic performance of fisheries is to base the decision to harvest on whether there is a benefit from leaving particular sizes of fish to reproduce or sell them today at market price. This takes into account both size-dependent fecundity and size-dependent pricing, two commonly overlooked features in bio-economic stock assessments. Here, this construct was applied in a bio-economic model that simulated the Northern Shelf Melanogrammus aeglefinus fishery and was evaluated against different age-at-first-capture selectivity policies under two individual growth types. The first growth type was the individual growth type seen in the Northern Shelf stock based on 2014 data and the second was a theoretical, linear growth type, which was designed to simulate a stock which contains larger, mature haddock. Furthermore, parameters from growth types corresponding to the historical cohorts from the years 1970-2006 were used to assess the economic consequences of changes in growth types throughout time. It was found that the construct which compared reproductive values against market values was not significantly worse than any of the age-at-first-capture, and therefore more practical, fishing approaches simulated, for both individual growth types. The construct also consistently produced some of the highest profit estimations for the fishery. Hence the construct is a resilient theoretical fishing strategy and movement towards this type of fishing should be encouraged. The fishery may also have experienced economic losses in performance attributable to changes in individual growth types seen over time, commonly referred to as the shrinking of larger haddock.
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  • 0976343290

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