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| Format: | Artículo científico |
| Sprache: | en |
| Veröffentlicht: |
Universidad de Valparaíso
2008
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| Online-Zugang: | https://www.redalyc.org/articulo.oa?id=47943111 |
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Inhaltsangabe:
- Method to obtain abundance indices in the population of Farfantepenaeus californiensis (Holmes, 1900) from the Gulf of Tehuantepec, Oaxaca, Mexico Pedro Cervantes-Hernández Ciencias de la Tierra recruits spawners Brown shrimp Mexican Pacific annual variation A method to model the annual abundance variation of the Farfantepenaeus californiensis (Holmes, 1900) from the Gulf of Tehuantepec, Oaxaca, Mexico is proposed. Principal components analysis (PCA) was used to obtain two population indices: the abundance of recruits, or FR index, and the abundance of spawners, or DR index. The age groupof four months was used to calculate the FR index and the age groups from six to 11 months were used to calculate the DR index. The analysis of the fishery mortality rate (F) indicated that shrimp between 12 (F = 0.88 monthly) and 16 months (F = 1.66 monthly) were overfished, and that 3 months old shrimp were observed partially recruited to the fishery (F = 0.02 monthly); for this reason, PCA did not show a significant factorloading in any of the indices. The age groups selected by PCA in each calculated population index were observed underfished in the natural population so that these age groups were considered very important to maintain the continuity of thefishery between 1989 and 1998. Based on the annual abundance variation of FR and DR obtained by the virtual population analysis (VPA), from July to August/September, the abundanceof recruits was higher than the spawners, while from Octoberto January, the abundance of spawners was higher than the recruits. 2008 artículo científico 0717-3326 https://www.redalyc.org/articulo.oa?id=47943111 en http://www.redalyc.org/revista.oa?id=479 Revista de Biología Marina y Oceanografía application/pdf Universidad de Valparaíso Revista de Biología Marina y Oceanografía (Chile) Num.1 Vol.43