Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery

This paper examines codend size selectivity in the Chilean hake (Merluccius gayi gayi) industrial fishery by means of four mesh sizes opening in the codend (100, 110, 130 and 140 mm mesh openings) and using the cover codend method. The data was analyzed by haul, using the SELECT model with both the...

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Autores principales:	Gálvez,Mauricio, Rebolledo,Hernán
Lenguaje:	English
Publicado:	Escuela de Ciencias del Mar. Pontificia Universidad Católica de Valparaíso 2005
Materias:	size selectivity bottom trawl net codend method SELECT model Master Curve hake Merluccius gayi gayi Chile
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-71782005000200003
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spelling	oai:scielo:S0717-717820050002000032007-12-12Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fisheryGálvez,MauricioRebolledo,Hernán size selectivity bottom trawl net codend method SELECT model Master Curve hake Merluccius gayi gayi Chile This paper examines codend size selectivity in the Chilean hake (Merluccius gayi gayi) industrial fishery by means of four mesh sizes opening in the codend (100, 110, 130 and 140 mm mesh openings) and using the cover codend method. The data was analyzed by haul, using the SELECT model with both the Logistic and Richards selection curves. For each mesh size opening and sex the combined haul analysis was made with the Fryer model, and with these results we determine the Master Curves, by sex. Based on critical length and maturity length at 50% estimated for this specie we determined the optimum mesh size opening for the trawl fishery. The rate of escape of cmomon hake increased exponentially with the size of mesh opening. The Logistic selection model was chosen based on the likelihood ratio test for all hauls analyzed. From the mean selection curves (incorporating haul variation) fitted to data for combined sexes, the total length of 50% retention (l50) were estimated to be 39.3, 39.7, 41.1 and 43.6 cm of total length for 100, 110, 130 and 140 mm of mesh size opening. The values of l50 for females were higher than those for males. We recommended 120 mm of mesh size opening in the codend in order to protect the spawning fraction of Chilean hake stock and maximize the biomass of the cohortsinfo:eu-repo/semantics/openAccessEscuela de Ciencias del Mar. Pontificia Universidad Católica de ValparaísoInvestigaciones marinas v.33 n.2 20052005-11-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-71782005000200003en10.4067/S0717-71782005000200003
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	size selectivity bottom trawl net codend method SELECT model Master Curve hake Merluccius gayi gayi Chile
spellingShingle	size selectivity bottom trawl net codend method SELECT model Master Curve hake Merluccius gayi gayi Chile Gálvez,Mauricio Rebolledo,Hernán Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery
description	This paper examines codend size selectivity in the Chilean hake (Merluccius gayi gayi) industrial fishery by means of four mesh sizes opening in the codend (100, 110, 130 and 140 mm mesh openings) and using the cover codend method. The data was analyzed by haul, using the SELECT model with both the Logistic and Richards selection curves. For each mesh size opening and sex the combined haul analysis was made with the Fryer model, and with these results we determine the Master Curves, by sex. Based on critical length and maturity length at 50% estimated for this specie we determined the optimum mesh size opening for the trawl fishery. The rate of escape of cmomon hake increased exponentially with the size of mesh opening. The Logistic selection model was chosen based on the likelihood ratio test for all hauls analyzed. From the mean selection curves (incorporating haul variation) fitted to data for combined sexes, the total length of 50% retention (l50) were estimated to be 39.3, 39.7, 41.1 and 43.6 cm of total length for 100, 110, 130 and 140 mm of mesh size opening. The values of l50 for females were higher than those for males. We recommended 120 mm of mesh size opening in the codend in order to protect the spawning fraction of Chilean hake stock and maximize the biomass of the cohorts
author	Gálvez,Mauricio Rebolledo,Hernán
author_facet	Gálvez,Mauricio Rebolledo,Hernán
author_sort	Gálvez,Mauricio
title	Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery
title_short	Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery
title_full	Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery
title_fullStr	Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery
title_full_unstemmed	Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery
title_sort	estimating codend size selectivity of bottom trawlnet in chilean hake (merluccius gayi gayi) fishery
publisher	Escuela de Ciencias del Mar. Pontificia Universidad Católica de Valparaíso
publishDate	2005
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-71782005000200003
work_keys_str_mv	AT galvezmauricio estimatingcodendsizeselectivityofbottomtrawlnetinchileanhakemerlucciusgayigayifishery AT rebolledohernan estimatingcodendsizeselectivityofbottomtrawlnetinchileanhakemerlucciusgayigayifishery
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Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery

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