Selectivity, pulse fishing and endogenous lifespan in Beverton-Holt models

José María Da Rocha, María-José Gutiérrez and Luis T. Antelo

No 1988-088X, DFAEII Working Papers from University of the Basque Country - Department of Foundations of Economic Analysis II

Abstract: Optimal management in a multi-cohort Beverton-Holt model with any number of age classes and imperfect selectivity is equivalent to finding the optimal fish lifespan by chosen fallow cycles. Optimal policy differs in two main ways from the optimal lifespan rule with perfect selectivity. First, weight gain is valued in terms of the whole population structure. Second, the cost of waiting is the interest rate adjusted for the increase in the pulse length. This point is especially relevant for assessing the role of selectivity. Imperfect selectivity reduces the optimal lifespan and the optimal pulse length. We illustrate our theoretical findings with a numerical example. Results obtained using global numerical methods select the optimal pulse length predicted by the optimal lifespan rule.

Keywords: optimisation in age-structured models; pulse fishing (search for similar items in EconPapers)
Date: 2012
New Economics Papers: this item is included in nep-cmp
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Citations: View citations in EconPapers (4)

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Journal Article: Selectivity, Pulse Fishing and Endogenous Lifespan in Beverton-Holt Models (2013)
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Dpto. de Fundamentos del Análisis Económico II, = Facultad de CC. Económicas y Empresariales, Universidad del País Vasco, Avda. Lehendakari Aguirre 83, 48015 Bilbao, Spain

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