{"title":"Artisanal elasmobranch fisheries of northwestern Baja Californi a, Mexico","authors":"O. Santana‐Morales","doi":"10.7773/cm.v46i1.3023","DOIUrl":null,"url":null,"abstract":"espanolLa composicion especifica de elasmobranquios y su variabilidad espaciotemporal en una region marina frecuentemente pueden ser caracterizadas mediante el muestreo de los desembarques de la pesqueria local, lo que puede tener implicaciones para su manejo. En el presente estudio, describimos la composicion de los desembarques de elasmobranquios en 4 principales puertos pesqueros artesanales en el noroeste de Baja California, Mexico. Los muestreos se realizaron de manera oportunista entre 1995 y 2010 e implicaron un esfuerzo de 684 dias de pesca. La composicion especifica dependio del arte de pesca y de la zona de pesca, con el dominio del tiburon zorro comun ( Alopias vulpinus ) y el tiburon perro espinoso ( Squalus suckleyi ) en las capturas con redes agalleras en la zona costera y el dominio del tiburon azul ( Prionace glauca ) y el tiburon mako ( Isurus oxyrhinchus ) en la captura con palangre en la zona oceanica. El analisis de la estructura de tallas indico que la captura de la mayoria de las especies estuvo compuesta, principalmente, por organismos juveniles, aunque la captura de individuos maduros de tiburon sulfin ( Galeorhinus galeus ) mostro un incremento en la pesca con palangre durante el invierno. Los resultados indican que puede haber diferencias regionales menores en la composicion especifica de elasmobranquios a lo largo de la costa pacifica de Baja California, lo cual podria estar relacionado con diferencias oceanograficas o de habitat entre regiones. El resultado de este estudio puede formar la base de futuros esfuerzos para monitorear los cambios en la composicion de las especies a lo largo del tiempo y, asi, evaluar de una manera mas completa las poblaciones de elasmobranquios. EnglishElasmobranch species composition and spatiotemporal variability can often be characterized from landing surveys of local fisheries, with important management implications. In the present study, we describe the elasmobranch landing composition of 4 major artisanal fishing ports in northwestern Baja California, Mexico. Sampling was conducted opportunistically between 1995 and 2010 and included an effort of 684 fishing days. Species composition was gear-dependent and varied with the fishing area, with thresher sharks ( Alopias vulpinus ) and spiny dogfish ( Squalus suckleyi ) dominating the catches landed by coastal gill net fisheries, and blue sharks ( Prionace glauca ) and shortfin mako sharks ( Isurus oxyrhinchus ) dominating the catches landed by the offshore longline fishery. Size-structure analysis indicated that catches were composed primarily of juveniles for most species, although the catch of mature soupfin sharks ( Galeorhinus galeus ) increased in longline fisheries during the winter. The results indicate that minor regional differences in elasmobranch species composition occur along the Pacific coast of Baja California and are most likely related to regional oceanographic or habitat differences. The results of this study may form the basis for future efforts to monitor species composition changes over time, to more completely assess elasmobranch populations.","PeriodicalId":50702,"journal":{"name":"Ciencias Marinas","volume":"46 1","pages":"1-18"},"PeriodicalIF":0.5000,"publicationDate":"2020-03-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"4","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Ciencias Marinas","FirstCategoryId":"99","ListUrlMain":"https://doi.org/10.7773/cm.v46i1.3023","RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"MARINE & FRESHWATER BIOLOGY","Score":null,"Total":0}
引用次数: 4
Abstract
espanolLa composicion especifica de elasmobranquios y su variabilidad espaciotemporal en una region marina frecuentemente pueden ser caracterizadas mediante el muestreo de los desembarques de la pesqueria local, lo que puede tener implicaciones para su manejo. En el presente estudio, describimos la composicion de los desembarques de elasmobranquios en 4 principales puertos pesqueros artesanales en el noroeste de Baja California, Mexico. Los muestreos se realizaron de manera oportunista entre 1995 y 2010 e implicaron un esfuerzo de 684 dias de pesca. La composicion especifica dependio del arte de pesca y de la zona de pesca, con el dominio del tiburon zorro comun ( Alopias vulpinus ) y el tiburon perro espinoso ( Squalus suckleyi ) en las capturas con redes agalleras en la zona costera y el dominio del tiburon azul ( Prionace glauca ) y el tiburon mako ( Isurus oxyrhinchus ) en la captura con palangre en la zona oceanica. El analisis de la estructura de tallas indico que la captura de la mayoria de las especies estuvo compuesta, principalmente, por organismos juveniles, aunque la captura de individuos maduros de tiburon sulfin ( Galeorhinus galeus ) mostro un incremento en la pesca con palangre durante el invierno. Los resultados indican que puede haber diferencias regionales menores en la composicion especifica de elasmobranquios a lo largo de la costa pacifica de Baja California, lo cual podria estar relacionado con diferencias oceanograficas o de habitat entre regiones. El resultado de este estudio puede formar la base de futuros esfuerzos para monitorear los cambios en la composicion de las especies a lo largo del tiempo y, asi, evaluar de una manera mas completa las poblaciones de elasmobranquios. EnglishElasmobranch species composition and spatiotemporal variability can often be characterized from landing surveys of local fisheries, with important management implications. In the present study, we describe the elasmobranch landing composition of 4 major artisanal fishing ports in northwestern Baja California, Mexico. Sampling was conducted opportunistically between 1995 and 2010 and included an effort of 684 fishing days. Species composition was gear-dependent and varied with the fishing area, with thresher sharks ( Alopias vulpinus ) and spiny dogfish ( Squalus suckleyi ) dominating the catches landed by coastal gill net fisheries, and blue sharks ( Prionace glauca ) and shortfin mako sharks ( Isurus oxyrhinchus ) dominating the catches landed by the offshore longline fishery. Size-structure analysis indicated that catches were composed primarily of juveniles for most species, although the catch of mature soupfin sharks ( Galeorhinus galeus ) increased in longline fisheries during the winter. The results indicate that minor regional differences in elasmobranch species composition occur along the Pacific coast of Baja California and are most likely related to regional oceanographic or habitat differences. The results of this study may form the basis for future efforts to monitor species composition changes over time, to more completely assess elasmobranch populations.
期刊介绍：
A bilingual open-access publication, Ciencias Marinas (CM) is an international peer-reviewed journal that contains original research findings in all areas of marine science. It is published quarterly by the Autonomous University of Baja California, Mexico, and all its contents are publicly available on our journal website. Though a limited number of copies are still printed, the journal is mainly distributed in its electronic format.
CM was conceived in 1973 as part of an academic project aimed to entice local researchers to publicly disclose their findings by adopting the culture of peer-review publishing. This academic project evolved into an international journal after accepting papers from researchers in the United States and, eventually, other parts of the world. Because of the diversity in authorship, CM issues were initially published in either Spanish or English, and occasionally in both languages. It was not until 1984 when CM included both language versions of all its contents, and it then became the fully bilingual journal it still is today. At CM we believe our inclusive format allows us not only to address a wider range of submissions from international authors but also to make published findings available to a wider international audience.
So whether you are looking for information on the redfish in Icelandic waters or the physical and biological properties of the Gulf of California, feel free to peruse CM contents. You may find them to provide source material for your research.
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