The East Atlantic Bluefin Tuna Fisheries: Stock Collapse or Recovery?

Bjørndal, Trond; Brasão, Ana

doi:10.1086/mre.21.2.42629504

Cited by 37 publications

(20 citation statements)

References 15 publications

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“…This description of the harvesting technology is also employed in the classical exposition from Beverton and Holt (1957) as well as in Tahvonen (2009a,b) and in much of the empirical literature (e.g. Bjørndal and Brasão 2006;Kulmala et al 2007;Kjaersgaard and Frost 2008).…”

Section: Related Literaturementioning

confidence: 99%

Growth Overfishing: The Race to Fish Extends to the Dimension of Size

Diekert

2012

Environ Resource Econ

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The gravity of growth overfishing is increasingly recognized. The size-distribution of fish stocks is often severely truncated, even when the overall biomass is reasonably well managed. In a first part of this article, I show how the "race to fish" extends to the dimension of size: Akin to the classical Bertrand competition in prices, each agent has an incentive to target fish at a smaller size. In fact, for perfect selectivity, competition between two agents is sufficient to dissipate all rents. In a second part of this article, I explore the implications of size-differentiated harvesting for ITQ regulation. I show that quotas specified in terms of numbers are far superior to those specified in terms of weight or value.

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Section: Related Literaturementioning

confidence: 99%

Growth Overfishing: The Race to Fish Extends to the Dimension of Size

Diekert

2012

Environ Resource Econ

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“…2 First, consider that there is perfect selectivity and p 1 , p 2 and F t can be selected by the regulator. If the value of adults, pr 2 ω 2 , is greater than the value of juveniles pr 1 ω 1 , the optimal policy consists of letting all juveniles become adults and catching only adults 3 .…”

Section: The Simplest Fishery With Two Age Classesmentioning

confidence: 99%

“…Although after Hannesson and Clark et al many other papers have found, by using numerical methods, that pulse fishing is the optimal policy in some fisheries modelled with Beverton-Holt models (Horwood, 1987;Bjørndal and Brasão, 2006;Bjørndal et al 2004aBjørndal et al , 2004bStage, 2006; Da Rocha et al, 2012), the first analytical results were only recently derived. Tahvonen (2009), proves that in a 2-age structured fisheries model with endogenous recruitment and harvesting costs, optimal harvesting consists of pulse fishing under specific conditions such as nonselective gear.…”

Section: Introductionmentioning

confidence: 99%

Selectivity, Pulse Fishing and Endogenous Lifespan in Beverton-Holt Models

Rocha

Gutiérrez

Antelo

2012

Environ Resource Econ

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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.JEL classification: O1, AMS 91B76, 92D25.

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“…Moreover, Armstrong (1999) investigated the harvest shares of trawlers and coastal vessels at particular TAC levels using the actual allocation rule for the Norwegian cod fishery. See also Armstrong and Sumaila (2001), Björndal and Brasao (2006), Stage (2006) and Diekert et al (2010) for more on applications of age-structured model for different case studies. A previous study of Skonhoft et al (2012) has recently formulated an age-structured model and derived MSY fishing mortalities similar to that of Reed's (1980).…”

Section: Introductionmentioning

confidence: 99%