Population size and exploitation of giant squid (<i>Dosidicus gigas</i> D'Orbigny, 1835) in the Gulf of California, Mexico

Comments about the relationship between temperature and giant squid catches

“…Esta idea, aunque se ha aceptado de manera empírica, hasta el momento no ha sido demostrada (Morales-Bojórquez et al, 2001a). Sin embargo, a pesar del efecto que podría tener el ambiente, se reconoce a este recurso como una pesquería inestable, donde las capturas dependen totalmente del reclutamiento inicial del calamar y de la capturabilidad de las flotas del Golfo de California, las cuales son flotas camaroneras que se adaptan a la pesca de calamar cuando el recurso camarón está en veda (Morales-Bojórquez y López-Martínez, 1999;Morales-Bojórquez et al, 2001b). De esta manera, la estimación de índices de abundancia relativa del recurso, tanto directos como indirectos de la pesquería, son importantes para la administración del calamar gigante.…”

“…However, to understand the success in the catch of giant squid in the Gulf of California, the adequate index for the fishery has to be estimated. In this case, the catchper-unit effort (CPUE) has been commonly used as an index in the squid fishery, some examples are shown by , Morales-Bojórquez et al (1997;2001b), Nevárez-Martínez and Morales-Bojórquez (1997) and Rosenberg et (Fiedler, 1984;Hayward, 2000;Lea y Rosenblatt, 2000). Esta idea, aunque se ha aceptado de manera empírica, hasta el momento no ha sido demostrada (Morales-Bojórquez et al, 2001a).…”

“…This idea, although accepted in an empirical way, has not been demonstrated yet (Morales-Bojórquez et al, 2001a). However, in spite of the effect that the environment might have, this resource is known as an unstable fishery, in which catches totally depend on the initial recruitment of the squid and on the catchability of the Gulf of California fleets, which are shrimp-fishing fleets that adapt to squid-fishing during the shrimp close season (Morales-Bojórquez and López-Martínez, 1999;Morales-Bojórquez et al, 2001b). In this way, the estimation of relative abundance indices for this resource, either direct or indirect from the fishery, are important for the giant squid management.…”

“…Since 1995, when the come back of the fishery occured, several squid stock assesments have been done from relative abundance indices obtained using data obtained in researchsurveys in the Gulf of California, Mexico (Hernández-Herrera et al, 1998;Nevárez-Martínez et al, 2000;Morales-Bojórquez et al, 2001b). The interpretation and analysis of squid relative abundance indices allowed proposing a management strategy for the resource (Hernández-Herrera et al, 1998) that was based on the reference point of F %BR , defined as fishing mortality (F) that allows sustaining a certain reproductive stock percentage (%BR), which is used to calculate and establish the management strategy of the proportional constant escapement (K), that is defined as exp (-F) (Nevárez-Martínez and MoralesBojórquez, 1997;Morales-Bojórquez et al, 2001b).…”

“…The interpretation and analysis of squid relative abundance indices allowed proposing a management strategy for the resource (Hernández-Herrera et al, 1998) that was based on the reference point of F %BR , defined as fishing mortality (F) that allows sustaining a certain reproductive stock percentage (%BR), which is used to calculate and establish the management strategy of the proportional constant escapement (K), that is defined as exp (-F) (Nevárez-Martínez and MoralesBojórquez, 1997;Morales-Bojórquez et al, 2001b). In this case, the relative abundance indices were estimated from sampling designs with stratification of the study area (Hernández-Herrera et al, 1998;Nevárez-Martínez et al, 2000).…”