Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)

Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)

The world tuna fishing fleet is dominated by purse seine boats. Purse seine sets are sometimes unsuccessful in capturing fish; these unsuccessful attempts are known as null sets. Null sets have been widely documented and the numbers indicate that they happen in large proportions. In Mexico, the tuna...

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Autores principales: Dreyfus-León, Michel J, Mejía-Trejo, Adán, Villaseñor-Derbez, Juan Carlos
Formato: info:eu-repo/semantics/article
Lenguaje:eng
Publicado: Iniversidad Autónoma de Baja California 2015
Acceso en línea:https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2471
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spelling repositorioinstitucional-20.500.12930-74712023-05-09T14:30:31Z Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013) Análisis de los lances nulos (sin captura) de la flota atunera mexicana que opera con red de cerco (2000–2013) Dreyfus-León, Michel J Mejía-Trejo, Adán Villaseñor-Derbez, Juan Carlos The world tuna fishing fleet is dominated by purse seine boats. Purse seine sets are sometimes unsuccessful in capturing fish; these unsuccessful attempts are known as null sets. Null sets have been widely documented and the numbers indicate that they happen in large proportions. In Mexico, the tuna fishery represents the second most important fishery by volume and value. The frequency of occurrence of null sets during the period 2000–2013 was analyzed to identify the regions, periods, and oceanographic conditions (e.g., ENSO) related to them. Null sets on free-swimming fish schools and between June and July had a higher relative representation. The region with highest relative occurrence was the mouth of the Gulf of California (between August and October). A positive correlation was observed between the occurrence of null sets on free-swimming fish schools and the Multivariate El Niño Index. The maximum values of occurrence of null sets were related to those months in which the water column structure presented changes. Comprehension of this phenomenon (null sets) and its relation to natural events is of importance for the fishery, as there could be repercussions for the economy and management of the resource. A nivel mundial, la flota atunera está dominada por embarcaciones con red de cerco como principal arte de captura. En ocasiones, al realizar los lances, no hay éxito de captura y a esos lances se les conoce como lances nulos. Los lances nulos han sido ampliamente documentados y se ha observado que ocurren en una gran proporción. En México, la pesca de túnidos representa la segunda pesquería más importante en volumen y valor. La finalidad de este trabajo fue analizar la frecuencia de ocurrencia de los lances nulos durante el periodo 2000–2013 para identificar regiones, periodos y condiciones oceanográficas (e.g., El Niño) asociados a éstos. Los lances nulos tuvieron mayor representación relativa cuando se realizaron sobre cardúmenes libres y entre junio y julio. La frecuencia relativa fue máxima en la boca del golfo de California, entre agosto y octubre. Se observó una correlación positiva entre la ocurrencia de lances nulos asociados a cardúmenes independientes y el Índice Multivariado de El Niño. Los valores máximos de ocurrencia de lances nulos estuvieron relacionados con los meses en los que se observan cambios en la estructura de la columna de agua. La comprensión de este fenómeno (lances nulos) y su asociación a eventos naturales es de suma importancia para la pesquería del atún, ya que podrían observarse importantes repercusiones en la economía y el manejo del recurso. 2015-06-12 2021-06-03T03:55:24Z 2021-06-03T03:55:24Z info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article Artículo Arbitrado https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2471 10.7773/cm.v41i2.2471 https://hdl.handle.net/20.500.12930/7471 eng https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2471/1559 Copyright (c) 2015 Ciencias Marinas application/pdf Iniversidad Autónoma de Baja California Ciencias Marinas; Vol. 41 No. 2 (2015); 85-92 Ciencias Marinas; Vol. 41 Núm. 2 (2015); 85-92 2395-9053 0185-3880
institution Repositorio Institucional
collection DSpace
language eng
description The world tuna fishing fleet is dominated by purse seine boats. Purse seine sets are sometimes unsuccessful in capturing fish; these unsuccessful attempts are known as null sets. Null sets have been widely documented and the numbers indicate that they happen in large proportions. In Mexico, the tuna fishery represents the second most important fishery by volume and value. The frequency of occurrence of null sets during the period 2000–2013 was analyzed to identify the regions, periods, and oceanographic conditions (e.g., ENSO) related to them. Null sets on free-swimming fish schools and between June and July had a higher relative representation. The region with highest relative occurrence was the mouth of the Gulf of California (between August and October). A positive correlation was observed between the occurrence of null sets on free-swimming fish schools and the Multivariate El Niño Index. The maximum values of occurrence of null sets were related to those months in which the water column structure presented changes. Comprehension of this phenomenon (null sets) and its relation to natural events is of importance for the fishery, as there could be repercussions for the economy and management of the resource.
format info:eu-repo/semantics/article
author Dreyfus-León, Michel J
Mejía-Trejo, Adán
Villaseñor-Derbez, Juan Carlos
spellingShingle Dreyfus-León, Michel J
Mejía-Trejo, Adán
Villaseñor-Derbez, Juan Carlos
Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)
author_facet Dreyfus-León, Michel J
Mejía-Trejo, Adán
Villaseñor-Derbez, Juan Carlos
author_sort Dreyfus-León, Michel J
title Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)
title_short Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)
title_full Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)
title_fullStr Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)
title_full_unstemmed Analysis of null sets (zero catch) made by the Mexican tuna purse seine fleet (2000–2013)
title_sort analysis of null sets (zero catch) made by the mexican tuna purse seine fleet (2000–2013)
publisher Iniversidad Autónoma de Baja California
publishDate 2015
url https://www.cienciasmarinas.com.mx/index.php/cmarinas/article/view/2471
_version_ 1792609121162231808

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