A first approach to the management of the incidental catch of the eastern Pacific Mexican tuna fleet

Juan Guillermo Vaca Rodríguez, Michel Jules Dreyfus León

Resumen


The information registered by the Mexican Tuna Management and Dolphin Protection Program (PNAAPD) observers on board the Mexican tuna vessels was used to make a basic statistical analysis of the incidental catch of the Mexican eastern Pacific fleet, and to evaluate different aspects of the spatial and seasonal closure strategy. Twenty spatial and seasonal units were identified and hierarchically classified by set-type into four categories (explosive, avoidable, preventive and acceptable) based on two criteria: the incidental catch per set and the number of sets. Incidental catch reduction curves were created. Finally, and example of incidental catch reduction was performed for the mahi-mahi (dolphin-fish) Coryphaena hippurus and C. aquisells, considering the reduction percentage of incidental catch and main objective species catch (yellowfin tuna, Thunnus albacares), and the number of spatial and seasonal units closed. Log-sets are the type of sets that contribute with the gratest amount of incidental catch, except for billfishes. Of the five analyzed areas, those located off the coasts of Mexico can be considered as those with lower risk for most of the species incidentally caught throughout the year. The direct strategy for most of the management objectives is to eliminate or reduce the number of log-sets for the Mexican tuna fleet, throughout the whole zone or in specific units, resulting in a significant incidental catch reduction and a minimal effect on the yellowfin catch. The choice among five alternatives, none better than the others, establishing the units to be closed and the order to do so to reduce the incidental catch, rests in the decision-makers, and is a function of their preferences in respects to the different criteria used to evaluate the alternatives.

Palabras clave


Incidental catch; bycatch; hot spots; management strategies; spatial and seasonal closures

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ISSN 0188-8897

 HIDROBIOLOGICA. Vol.26 Año 2016, Número 3, septiembre-diciembre de 2016, es una publicación cuatrimestral editada por la Universidad Autónoma Metropolitana, a través de la Unidad    Iztapalapa, División de Ciencias Biológicas y de la Salud, Departamento de Hidrobiología. Prolongación Canal de Miramontes 3855, colonia Ex Hacienda San Juan de Dios, delegación Tlalpan,  C.P. 14387, México, Ciudad de México y Av. San Rafael Atlixco, núm. 186, colonia Vicentina, delegación Iztapalapa, C.P. 09340, México, Ciudad de México, teléfono 5804-6475. Página  electrónica de la revista: http://hidrobiologica.izt.uam.mx y dirección electrónica: rehb@xanum.uam.mx. Editora Responsable María Esther Meave del Castillo. Certificado de Reserva de  Derechos al Uso Exclusivo de Título No. 04-2010-072711181500-203, ISSN para version impresa e ISSN para revista electronica son otorgados por el Instituto Nacional del Derecho de Autor. Responsable de la última actualización  de este número María Esther Meave del Castillo, Universidad Autónoma Metropolitana Unidad Iztapalapa, Av. San Rafael Atlixco, núm. 186, colonia Vicentina, delegación Iztapalapa, C.P.  09340, México, Ciudad de México. Fecha de última modificación: 2 de marzo de 2017. Tamaño de archivo: 30 MB.Las opiniones expresadas por los autores no necesariamente reflejan la  postura del editor de la publicación.Queda estrictamente prohibida la reproducción total o parcial de los contenidos e imágenes de la publicación sin previa autorización de la Universidad  Autónoma Metropolitana. 

ISSN para versión impresa 0188-8897 

ISSN para version electronica 2448-7333