Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico

Some flatfish's species are caught incidentally in bottom-trawls and some of them are the target of an artisanal fishery in the Gulf of California, Mexico. To know the number of individuals removed from a population and the effects of their removal, the aim in this study was to estimate the abu...

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Autores principales:	Rábago-Quiroz,Carlos Hiram, López-Martínez,Juana, Nevárez-Martínez,Manuel O, Morales-Bojórquez,Enrique
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2015
Materias:	Abundance size structure flatfish Gulf of California incidental capture
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572015000300003
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spelling	oai:scielo:S0718-195720150003000032015-10-19Abundance and size structure of flatfish species on the west side of the Gulf of California, MexicoRábago-Quiroz,Carlos HiramLópez-Martínez,JuanaNevárez-Martínez,Manuel OMorales-Bojórquez,Enrique Abundance size structure flatfish Gulf of California incidental capture Some flatfish's species are caught incidentally in bottom-trawls and some of them are the target of an artisanal fishery in the Gulf of California, Mexico. To know the number of individuals removed from a population and the effects of their removal, the aim in this study was to estimate the abundance of flatfishes caught as bycatch in bottom-trawls and by artisanal or small-scale fishery in the Gulf of California and determinate the possible competition between fleets (bottom-trawl and artisanal with gillnets) for the same resource. During 2002 and 2003, samples were collected from 3 sources: (1) surveys of 2 vessels from the shrimp trawl fleet; (2) surveys in 2 research cruisers; and (3) from an artisanal fleet operating in the coast of the state of Sonora, Mexico. Abundance of flatfishes caught in bottom-trawls was estimated using the swept area method, and through the catch-at-size analysis for the flatfishes caught by the artisanal fishery. Fourteen flatfish species were identified as bycatch in the bottom-trawl, of which those that stand out in abundance were: Paralichthys woolmani, Etropus crossotus, Citharichthys fragilis, Citharichthys gilberti, Achirus mazatlanus and Syacium ovale. Six of the 14 flatfishes incidentally captured by the shrimp fleet were caught by artisanal fishery, of which 70% consist of P. woolmani. Each fleet operated on different population fractions; sizes from 25 to 90 cm in total length were obtained by the artisanal fleet with fishing mortality values and exploitation rates-at-size < 0.01 while bycatch in the shrimp fleet consisted of individuals from 4 to 20 cm, which shows fishing pressure on younger individuals. However, removals of these young individuals could have negative effects because they could be recruits for artisanal fishery.info:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.50 n.2 20152015-08-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572015000300003en10.4067/S0718-19572015000300003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Abundance size structure flatfish Gulf of California incidental capture
spellingShingle	Abundance size structure flatfish Gulf of California incidental capture Rábago-Quiroz,Carlos Hiram López-Martínez,Juana Nevárez-Martínez,Manuel O Morales-Bojórquez,Enrique Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico
description	Some flatfish's species are caught incidentally in bottom-trawls and some of them are the target of an artisanal fishery in the Gulf of California, Mexico. To know the number of individuals removed from a population and the effects of their removal, the aim in this study was to estimate the abundance of flatfishes caught as bycatch in bottom-trawls and by artisanal or small-scale fishery in the Gulf of California and determinate the possible competition between fleets (bottom-trawl and artisanal with gillnets) for the same resource. During 2002 and 2003, samples were collected from 3 sources: (1) surveys of 2 vessels from the shrimp trawl fleet; (2) surveys in 2 research cruisers; and (3) from an artisanal fleet operating in the coast of the state of Sonora, Mexico. Abundance of flatfishes caught in bottom-trawls was estimated using the swept area method, and through the catch-at-size analysis for the flatfishes caught by the artisanal fishery. Fourteen flatfish species were identified as bycatch in the bottom-trawl, of which those that stand out in abundance were: Paralichthys woolmani, Etropus crossotus, Citharichthys fragilis, Citharichthys gilberti, Achirus mazatlanus and Syacium ovale. Six of the 14 flatfishes incidentally captured by the shrimp fleet were caught by artisanal fishery, of which 70% consist of P. woolmani. Each fleet operated on different population fractions; sizes from 25 to 90 cm in total length were obtained by the artisanal fleet with fishing mortality values and exploitation rates-at-size < 0.01 while bycatch in the shrimp fleet consisted of individuals from 4 to 20 cm, which shows fishing pressure on younger individuals. However, removals of these young individuals could have negative effects because they could be recruits for artisanal fishery.
author	Rábago-Quiroz,Carlos Hiram López-Martínez,Juana Nevárez-Martínez,Manuel O Morales-Bojórquez,Enrique
author_facet	Rábago-Quiroz,Carlos Hiram López-Martínez,Juana Nevárez-Martínez,Manuel O Morales-Bojórquez,Enrique
author_sort	Rábago-Quiroz,Carlos Hiram
title	Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico
title_short	Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico
title_full	Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico
title_fullStr	Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico
title_full_unstemmed	Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico
title_sort	abundance and size structure of flatfish species on the west side of the gulf of california, mexico
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2015
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572015000300003
work_keys_str_mv	AT rabagoquirozcarloshiram abundanceandsizestructureofflatfishspeciesonthewestsideofthegulfofcaliforniamexico AT lopezmartinezjuana abundanceandsizestructureofflatfishspeciesonthewestsideofthegulfofcaliforniamexico AT nevarezmartinezmanuelo abundanceandsizestructureofflatfishspeciesonthewestsideofthegulfofcaliforniamexico AT moralesbojorquezenrique abundanceandsizestructureofflatfishspeciesonthewestsideofthegulfofcaliforniamexico
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Abundance and size structure of flatfish species on the west side of the Gulf of California, Mexico

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