Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico

Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico

Information about California sea lion prey and the artisanal fishery catch in the area of the Los Islotes sea lion rookery, in northeastern La Paz Bay, México, was examined to estimate potential overlap and competition between these consumers. Sea lions there consume about 435 t annually, with peak...

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Huvudupphovsmän: Aurioles-Gamboa, D, García-Rodríguez, F, Ramírez-Rodríguez, M, Hernández-Camacho, C
Materialtyp: Online
Språk:eng
Publicerad: Iniversidad Autónoma de Baja California 2003
Länkar:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/151
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id oai:cienciasmarinas.com.mx:article-151
record_format ojs
institution Ciencias Marinas
collection OJS
language eng
format Online
author Aurioles-Gamboa, D
García-Rodríguez, F
Ramírez-Rodríguez, M
Hernández-Camacho, C
spellingShingle Aurioles-Gamboa, D
García-Rodríguez, F
Ramírez-Rodríguez, M
Hernández-Camacho, C
Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico
author_facet Aurioles-Gamboa, D
García-Rodríguez, F
Ramírez-Rodríguez, M
Hernández-Camacho, C
author_sort Aurioles-Gamboa, D
title Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico
title_short Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico
title_full Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico
title_fullStr Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico
title_full_unstemmed Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico
title_sort interaction between the california sea lion and the artisanal fishery in la paz bay, gulf of california, mexico
description Information about California sea lion prey and the artisanal fishery catch in the area of the Los Islotes sea lion rookery, in northeastern La Paz Bay, México, was examined to estimate potential overlap and competition between these consumers. Sea lions there consume about 435 t annually, with peak consumption in winter. The artisanal fishery captures about 730 t of bony fish annually, with an increase in summer. Based on a five-year study, sea lions preyed on 76 fish species, but in terms of relative importance (RI), 35% of these was represented by only five species, of which only one has regional commercial value. Principal fishery targets comprised 28 species in four families, representing 76.2% of the total capture. Of these, the remains of only two species appeared in sea lion scats, and of them, only the spotted sand bass, Paralabrax maculatofasciatus, has significant commercial value, but it is poorly represented as sea lion prey (< 5% RI). Despite the limited overlap with fishery target species, the Los Islotes population exhibited the highest entanglement index (7–9%) of all sea lion colonies studied in Mexico. All sex/age categories of sea lions showed similar entanglement indices, with the entangled fraction approximately proportional to the total population for three surveys in different years. The data suggest that most animals become entangled by accident. Entanglement is probably due to the combined effect of extensive gillnet deployment in the bay and overlap in the areas where sea lions feed and fishermen operate.
publisher Iniversidad Autónoma de Baja California
publishDate 2003
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/151
_version_ 1715723936450215936
spelling oai:cienciasmarinas.com.mx:article-1512019-04-25T21:24:41Z Interaction between the California sea lion and the artisanal fishery in La Paz Bay, Gulf of California, Mexico Interacción entre el lobo marino de California y la pesquería artesanal en la Bahía de La Paz, Golfo de California, México Aurioles-Gamboa, D García-Rodríguez, F Ramírez-Rodríguez, M Hernández-Camacho, C California sea lion artisanal fishery feeding habits entanglement Mexico lobo marino de California pesquería artesanal hábitos alimentarios enmalle México Information about California sea lion prey and the artisanal fishery catch in the area of the Los Islotes sea lion rookery, in northeastern La Paz Bay, México, was examined to estimate potential overlap and competition between these consumers. Sea lions there consume about 435 t annually, with peak consumption in winter. The artisanal fishery captures about 730 t of bony fish annually, with an increase in summer. Based on a five-year study, sea lions preyed on 76 fish species, but in terms of relative importance (RI), 35% of these was represented by only five species, of which only one has regional commercial value. Principal fishery targets comprised 28 species in four families, representing 76.2% of the total capture. Of these, the remains of only two species appeared in sea lion scats, and of them, only the spotted sand bass, Paralabrax maculatofasciatus, has significant commercial value, but it is poorly represented as sea lion prey (< 5% RI). Despite the limited overlap with fishery target species, the Los Islotes population exhibited the highest entanglement index (7–9%) of all sea lion colonies studied in Mexico. All sex/age categories of sea lions showed similar entanglement indices, with the entangled fraction approximately proportional to the total population for three surveys in different years. The data suggest that most animals become entangled by accident. Entanglement is probably due to the combined effect of extensive gillnet deployment in the bay and overlap in the areas where sea lions feed and fishermen operate. Se analizó información acerca de las presas del lobo marino de California (Zalophus californianus californianus) y la composición de la captura de la pesquería artesanal alrededor de la lobera de Los Islotes, Bahía de La Paz, México, para estimar la superposición y competencia potencial entre estos consumidores. Los lobos marinos consumen cerca de 435 t anualmente, con un pico de consumo en el invierno. La pesquería artesanal extrae cerca de 730 t de peces óseos anualmente, registrándose un incremento en verano. De acuerdo con muestreos que cubren cinco años entre 1980 y 1994, los lobos marinos depredaron sobre un total de 76 especies de peces; sin embargo, en términos de importancia relativa (IR), el 35% estuvo concentrado en cinco presas, de las cuales sólo una tiene valor comercial en el área. Los principales objetivos de la pesquería se centraron en cuatro familias que significaron el 76.2% de la captura total e incluyeron 28 especies. De estas especies, únicamente dos aparecieron en la materia fecal de lobo marino, siendo la cabrilla arenera (Paralabrax maculatofasciatus) la única con valor comercial significativo, pero ésta estuvo pobremente representada en la dieta del lobo marino (< 5% IR). A pesar de la poca superposición en sus objetivos de pesca, la población de Los Islotes presenta el mayor índice de enmalle (7~9%) de todas las colonias de lobo marino estudiadas en México. Todas las categorías sexo/edad de lobo marino tuvieron índices de enmalle similares, siendo la fracción de lobos marinos enmallados aproximadamente proporcional en estructura a la población total, durante tres años distintos. Estos datos sugieren que la mayoría de los animales se enmallan accidentalmente y al azar. El enmalle se debe probablemente al efecto combinado del amplio uso de redes agalleras en la bahía y la superposición de las áreas de alimentación de los lobos marinos y las áreas operativas de los pescadores. Iniversidad Autónoma de Baja California 2003-03-06 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado application/pdf https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/151 10.7773/cm.v29i3.151 Ciencias Marinas; Vol. 29 No. 3 (2003); 357-370 Ciencias Marinas; Vol. 29 Núm. 3 (2003); 357-370 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/151/127

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