Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone

Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone

The longline is the most common fishing gear used to catch pelagic fish species. It consists of a principal line or mother line from which secondary lines with hooks hang. This fishing gear has demonstrated its efficiency to catch tuna, shark and billfish. The relative specific selectivity, accordin...

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Autores principales: Santana-Hernández, H, Macías-Zamora, R, Valdez-Flores, JJ
Formato: Online
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 1998
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/745
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spelling oai:cienciasmarinas.com.mx:article-7452019-05-21T17:36:11Z Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone Selectividad del sistema de palangre utilizado por la flota mexicana en la zona económica exclusiva Santana-Hernández, H Macías-Zamora, R Valdez-Flores, JJ longline selectivity pelagic species palangre selectividad especies pelágicas The longline is the most common fishing gear used to catch pelagic fish species. It consists of a principal line or mother line from which secondary lines with hooks hang. This fishing gear has demonstrated its efficiency to catch tuna, shark and billfish. The relative specific selectivity, according to some authors, seems to be influenced by factors like fishing strategy, horizontal and vertical species distribution, and the kind and size of bait. In this paper, a practica1 method to estimate hook operating depth is proposed, taking into consideration the catenary line formed by the mother line in each section. This estimate was validated with data obtained by means of a CTD meter placed at the same depth as the hooks during the longline operation. Moreover, an analysis of the species composition of the catch at each hook depth was performed. The results indicate that there is a difference of more than 30 m between operating depths in each section. Likewise, significant differences (at level α = 0.05) among catches at each operating level were observed. El palangre es un arte de pesca utilizado en la captura de peces pelágicos. Consiste de una línea principal o línea madre de la cual penden líneas secundarias, con anzuelos, llamadas reinales. Este arte de pesca ha demostrado su eficiencia para la captura de atunes, tiburones y picudos. La selectividad específica relativa, de acuerdo con algunos autores, parece estar influenciada por factores como la estrategia de pesca, la distribución horizontal y vertical de las especies y el tipo y tamaño de camada. En el presente trabajo se propone un método práctico para la estimación de la profundidad a la que operan los anzuelos, considerando la catenaria formada por la línea madre en cada sección. Esta estimación se comparó con datos obtenidos con un CTD colocado en la posición de los anzuelos durante la operación del palangre. Además, se realizó un análisis de la composición específica de la captura obtenida en cada posición del anzuelo. Los resultados indican que existe una diferencia de más de 30 m entre las profundidades de operación de los anzuelos en una sección. De la misma forma, se observó que existieron diferencias significativas (al nivel α = 0.05) en la captura específica efectuada en cada nivel de operación. Iniversidad Autónoma de Baja California 1998-03-06 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/745 10.7773/cm.v24i2.745 Ciencias Marinas; Vol. 24 No. 2 (1998); 193-210 Ciencias Marinas; Vol. 24 Núm. 2 (1998); 193-210 2395-9053 0185-3880 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/745/672
institution Ciencias Marinas
collection OJS
language eng
format Online
author Santana-Hernández, H
Macías-Zamora, R
Valdez-Flores, JJ
spellingShingle Santana-Hernández, H
Macías-Zamora, R
Valdez-Flores, JJ
Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone
author_facet Santana-Hernández, H
Macías-Zamora, R
Valdez-Flores, JJ
author_sort Santana-Hernández, H
title Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone
title_short Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone
title_full Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone
title_fullStr Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone
title_full_unstemmed Selectivity of the longline system used by the Mexican fleet in the exclusive economic zone
title_sort selectivity of the longline system used by the mexican fleet in the exclusive economic zone
description The longline is the most common fishing gear used to catch pelagic fish species. It consists of a principal line or mother line from which secondary lines with hooks hang. This fishing gear has demonstrated its efficiency to catch tuna, shark and billfish. The relative specific selectivity, according to some authors, seems to be influenced by factors like fishing strategy, horizontal and vertical species distribution, and the kind and size of bait. In this paper, a practica1 method to estimate hook operating depth is proposed, taking into consideration the catenary line formed by the mother line in each section. This estimate was validated with data obtained by means of a CTD meter placed at the same depth as the hooks during the longline operation. Moreover, an analysis of the species composition of the catch at each hook depth was performed. The results indicate that there is a difference of more than 30 m between operating depths in each section. Likewise, significant differences (at level α = 0.05) among catches at each operating level were observed.
publisher Iniversidad Autónoma de Baja California
publishDate 1998
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/745
_version_ 1715724005859655680

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