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Linkage between fishers' foraging, market and fish stocks density: Examples from some North Sea fisheries ArchiMer
Marchal, Paul; Poos, Jan-jaap; Quirijns, Floor.
This study has investigated some properties of fishermen's foraging, using Levy flights theory. The case studies examined were a selection of North Sea Dutch and French vessels, for which catch and effort data were collected on a haul-by-haul basis. Foraging behavior could reasonably be represented by a Levy flight process, characterized by an exponentiation factor mu, for both fleets. The properties of fishers' foraging were further investigated for the Dutch fleet using time series analysis. Optimal foraging was found with mu = 1.5, suggesting a slow recovery dynamics of the stocks being harvested. Efficient foraging led to high value per unit effort, while the knowledge of fishing grounds with high stock density is shown to increase foraging efficiency...
Tipo: Text Palavras-chave: Haul by haul data; Foraging; Fishing effort; Levy flights; Fleet behavior.
Ano: 2007 URL:
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