Journal Article

A bioeconomic multispecies analysis of an estuarine small-scale fishery: spatial structure of biovalue

Mario Rueda and Omar Defeo

in ICES Journal of Marine Science

Published on behalf of ICES/CIEM

Volume 60, issue 4, pages 721-732
Published in print January 2003 | ISSN: 1054-3139
Published online January 2003 | e-ISSN: 1095-9289 | DOI: http://dx.doi.org/10.1016/S1054-3139(03)00096-1
A bioeconomic multispecies analysis of an estuarine small-scale fishery: spatial structure of biovalue

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We estimated the spatial population structure by size and the economical potential (biovalue) of a multispecies fish resource in an estuarine lagoon in Colombia, based on fishery-dependent (catch and effort) and independent (seasonal fishing surveys) data. Model-based (geostatistics, kriging) estimations of such performance variables were used to quantify the uncertainty in abundance, individual price by size and variable costs per haul. Monte Carlo analysis was used to assess the status of the fishery. The spatial dimension of risk analysis was explored by indicator kriging, whereas effects of biovalue on the spatial allocation of fishing effort were evaluated using contingency tables. Fish abundance, individual sizes and biovalue were spatially structured, but the spatial patterns varied between seasons and species. Analysis of biovalue showed a moderate risk that fishers had economic losses derived from the fishing activity. Spatial risk analysis showed that no more than 30% of the total area from the lagoon registered profitable levels of fish abundance, which affected the spatial allocation of fishing effort. Management implications supported by our study suggest seasonal and spatial fishing closures to protect juveniles and spawning stock of fish species.

Keywords: fish abundance; population structure; biovalue; geostatistics; spatial risk analysis; tropical estuarine lagoon; Colombia

Journal Article.  5606 words.  Illustrated.

Subjects: Environmental Science ; Marine and Estuarine Biology

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