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ICES Journal of Marine Science: Journal du Conseil 2005 62(3):477-482; doi:10.1016/j.icesjms.2004.12.002
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© 2004 International Council for the Exploration of the Sea

Lévy trajectories of Peruvian purse-seiners as an indicator of the spatial distribution of anchovy (Engraulis ringens)

Sophie Bertranda,*, Julian M. Burgosb, François Gerlottoa and Jaime Atiquipac

a IRD (Research Institute for Development) Centre de Recherche Halieutique Méditerranéenne et Tropicale Avenue Jean Monnet, BP 171, 34203 Sète Cedex, France
b University of Washington, School of Aquatic and Fishery Sciences 1122 NE Boat Street (Box 355020), Seattle, WA 98195-5020, USA
c IMARPE (Peruvian Institute of the Sea) Esquina Gamarra y Gral. Valles s/n, Chucuito, Callao, Lima, Peru

*Correspondence to S. Bertrand: tel: +33 4 99 57 32 20; fax: +33 4 99 57 32 95. e-mail: Sophie.Bertrand{at}ird.fr.

Analogous to other top predators foraging on patchy resources, the spatial behaviour of fishers provides information on the spatial organization of fish. Focusing on the Peruvian anchovy purse-seine fishery, vessel monitoring system data are used to describe fishing vessels' trajectories, and acoustic survey data to characterize anchovy spatial distribution. Vessel trajectories were analysed in terms of move-length distribution, whereas fish distribution was characterized by spatial extent, concentration, and fractal dimension. Fishers perform Lévy flights that can be characterized by a single statistic (µ); µ is significantly correlated with the fractal dimension of fish distribution. It is argued that the Lévy statistic is a good candidate for an ecosystem indicator that might contribute to real-time monitoring of ecosystems.

Keywords: anchovy spatial distribution, fishing vessel trajectories, fractal dimension, Lévy flights, predator–prey relationships, vessel monitoring system

Received 1 April 2004; accepted 3 November 2004.


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