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Metazoan parasites of Engraulis ringens as tools for stock discrimination along the Chilean coast

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The value of the metazoan parasites of the anchoveta Engraulis ringens as biological tags for stock discrimination is assessed. Three hundred and fifty-nine specimens, obtained from six landing ports in northern and central Chile (Arica, Antofagasta, Caldera, Coquimbo, Valparaiso and Talcahuano) covering a latitudinal gradient of c. 18°, were analysed. Six metazoan parasite species (three ectoparasites and three endoparasites) were obtained. A correspondence analysis suggested that anchoveta from northern and central Chile are comprised of two stocks. Identification of stocks was largely based on qualitative differences (absence in southern localities of the monogenean Pseudanthocotyloides heterocotyle, a parasite proper of engraulids, and the copepod Caligus sp.) and quantitative differences in the prevalence of infection for the remaining species. Inertia and mass value for the correspondence analysis supported the hypothesis of two stocks.

Keywords: anchoveta; multivariate analysis; south-eastern Pacific; stock identification

Document Type: Regular Paper


Affiliations: Instituto de Investigaciones Oceanológicas, Universidad de Antofagasta, P. O. Box 170, Antofagasta, Chile

Publication date: May 1, 2007


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