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| Format: | Artículo científico |
| Language: | en |
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Pontificia Universidad Católica de Valparaíso
2005
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| Online Access: | https://www.redalyc.org/articulo.oa?id=45633203 |
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| _version_ | 1866585564493381632 |
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| author | Mauricio Gálvez |
| author_facet | Mauricio Gálvez |
| contents | Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery Mauricio Gálvez Hernán Rebolledo Ciencias de la Tierra Chile SELECT model Master Curve codend method size selectivity This paper examines codend size selectivity in the Chilean hake (Merluccius gayi gayi) industrial fisheryby means of four mesh sizes opening in the codend (100, 110, 130 and 140 mm mesh openings) and using the covercodend method. The data was analyzed by haul, using the SELECT model with both the Logistic and Richards selectioncurves. For each mesh size opening and sex the combined haul analysis was made with the Fryer model, and with theseresults we determine the Master Curves, by sex. Based on critical length and maturity length at 50% estimated for thisspecie we determined the optimum mesh size opening for the trawl fishery. The rate of escape of cmomon hakeincreased exponentially with the size of mesh opening. The Logistic selection model was chosen based on the likelihoodratio test for all hauls analyzed. From the mean selection curves (incorporating haul variation) fitted to data for combinedsexes, 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. Werecommended 120 mm of mesh size opening in the codend in order to protect the spawning fraction of Chilean hakestock and maximize the biomass of the cohorts. 2005 artículo científico 0716-1069 https://www.redalyc.org/articulo.oa?id=45633203 en http://www.redalyc.org/revista.oa?id=456 Investigaciones Marinas application/pdf Pontificia Universidad Católica de Valparaíso Investigaciones Marinas (Chile) Num.2 Vol.33 |
| format | Artículo científico |
| id | redalyc_45633203 |
| language | en |
| publishDate | 2005 |
| publisher | Pontificia Universidad Católica de Valparaíso |
| spellingShingle | Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery Mauricio Gálvez Ciencias de la Tierra Chile SELECT model Master Curve codend method size selectivity Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery Mauricio Gálvez Hernán Rebolledo Ciencias de la Tierra Chile SELECT model Master Curve codend method size selectivity This paper examines codend size selectivity in the Chilean hake (Merluccius gayi gayi) industrial fisheryby means of four mesh sizes opening in the codend (100, 110, 130 and 140 mm mesh openings) and using the covercodend method. The data was analyzed by haul, using the SELECT model with both the Logistic and Richards selectioncurves. For each mesh size opening and sex the combined haul analysis was made with the Fryer model, and with theseresults we determine the Master Curves, by sex. Based on critical length and maturity length at 50% estimated for thisspecie we determined the optimum mesh size opening for the trawl fishery. The rate of escape of cmomon hakeincreased exponentially with the size of mesh opening. The Logistic selection model was chosen based on the likelihoodratio test for all hauls analyzed. From the mean selection curves (incorporating haul variation) fitted to data for combinedsexes, 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. Werecommended 120 mm of mesh size opening in the codend in order to protect the spawning fraction of Chilean hakestock and maximize the biomass of the cohorts. 2005 artículo científico 0716-1069 https://www.redalyc.org/articulo.oa?id=45633203 en http://www.redalyc.org/revista.oa?id=456 Investigaciones Marinas application/pdf Pontificia Universidad Católica de Valparaíso Investigaciones Marinas (Chile) Num.2 Vol.33 |
| title | Estimating codend size selectivity of bottom trawlnet in Chilean hake (Merluccius gayi gayi) fishery |
| topic | Ciencias de la Tierra Chile SELECT model Master Curve codend method size selectivity |
| url | https://www.redalyc.org/articulo.oa?id=45633203 |