Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil

The relative abundance and fishing potential of the commercially valuable fishes and cephalopods with marketable size was assessed using two seasonal bottom trawl surveys performed in 2001 and 2002 on the outer shelf and upper slope (100-600 m depth) off the coast of southern Brazil. These surveys w...

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Autores principales:	Haimovici,Manuel, Gomes Fischer,Luciano, Rossi-Wongtschowski,Carmem L.D.B.S, Ávila Bernardes,Roberto, Aguiar dos Santos,Roberta
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2009
Materias:	demersal fishes stock assessment biomass Brazil
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000300010
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spelling	oai:scielo:S0718-560X20090003000102010-03-17Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern BrazilHaimovici,ManuelGomes Fischer,LucianoRossi-Wongtschowski,Carmem L.D.B.SÁvila Bernardes,RobertoAguiar dos Santos,Roberta demersal fishes stock assessment biomass Brazil The relative abundance and fishing potential of the commercially valuable fishes and cephalopods with marketable size was assessed using two seasonal bottom trawl surveys performed in 2001 and 2002 on the outer shelf and upper slope (100-600 m depth) off the coast of southern Brazil. These surveys were part of REVIZEE, a national program designed to assess the fishery potential within the Economic Exclusive Zone. Of the 228 fish and cephalopod species caught during the surveys, only 27 species and genera were considered to be of commercial interest. Commercial-sized individuals of these species made up 52.3% of the total catch. The total biomass was estimated to be 167,193 ton (± 22%) and 165,460 ton (± 25%) in the winter-spring and summer-autumn surveys, respectively. The most abundant species were the Argentine short-fin squid Illex argentinas, a species with highly variable recruitment, followed by the Argentine hake Merluccius hubbsi, the gulf-hake Urophycis mystacea, and the monkfish Lophius gastrophysus. The latter three were intensively fished prior to the surveys, as well as the beardfish Polymixia lowei and silvery John dory Zenopsis conchifera, both relatively abundant but with a very low market value. The potential yield of the demersal fish species, not considering Illex argentinus, estimated with the Gulland equation for a mean natural mortality of M = 0.31, was 20,460 ton. When considering only Merluccius hubbsi, Urophycis mystacea, and Lophius gastrophysus, the potential yield decreased to 6,625 ton. The surveys showed that the fishery potential of the outer shelf and upper slope was substantially lower than that of the inner shelf. Therefore, this environment should be carefully monitored to avoid overfishing and fast depletion.info:eu-repo/semantics/openAccessPontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del MarLatin american journal of aquatic research v.37 n.3 20092009-01-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000300010en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	demersal fishes stock assessment biomass Brazil
spellingShingle	demersal fishes stock assessment biomass Brazil Haimovici,Manuel Gomes Fischer,Luciano Rossi-Wongtschowski,Carmem L.D.B.S Ávila Bernardes,Roberto Aguiar dos Santos,Roberta Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil
description	The relative abundance and fishing potential of the commercially valuable fishes and cephalopods with marketable size was assessed using two seasonal bottom trawl surveys performed in 2001 and 2002 on the outer shelf and upper slope (100-600 m depth) off the coast of southern Brazil. These surveys were part of REVIZEE, a national program designed to assess the fishery potential within the Economic Exclusive Zone. Of the 228 fish and cephalopod species caught during the surveys, only 27 species and genera were considered to be of commercial interest. Commercial-sized individuals of these species made up 52.3% of the total catch. The total biomass was estimated to be 167,193 ton (± 22%) and 165,460 ton (± 25%) in the winter-spring and summer-autumn surveys, respectively. The most abundant species were the Argentine short-fin squid Illex argentinas, a species with highly variable recruitment, followed by the Argentine hake Merluccius hubbsi, the gulf-hake Urophycis mystacea, and the monkfish Lophius gastrophysus. The latter three were intensively fished prior to the surveys, as well as the beardfish Polymixia lowei and silvery John dory Zenopsis conchifera, both relatively abundant but with a very low market value. The potential yield of the demersal fish species, not considering Illex argentinus, estimated with the Gulland equation for a mean natural mortality of M = 0.31, was 20,460 ton. When considering only Merluccius hubbsi, Urophycis mystacea, and Lophius gastrophysus, the potential yield decreased to 6,625 ton. The surveys showed that the fishery potential of the outer shelf and upper slope was substantially lower than that of the inner shelf. Therefore, this environment should be carefully monitored to avoid overfishing and fast depletion.
author	Haimovici,Manuel Gomes Fischer,Luciano Rossi-Wongtschowski,Carmem L.D.B.S Ávila Bernardes,Roberto Aguiar dos Santos,Roberta
author_facet	Haimovici,Manuel Gomes Fischer,Luciano Rossi-Wongtschowski,Carmem L.D.B.S Ávila Bernardes,Roberto Aguiar dos Santos,Roberta
author_sort	Haimovici,Manuel
title	Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil
title_short	Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil
title_full	Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil
title_fullStr	Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil
title_full_unstemmed	Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil
title_sort	biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern brazil
publisher	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar
publishDate	2009
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000300010
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_version_	1714205065757065216

Biomass and fishing potential yield of demersal resources from the outer shelf and upper slope of southern Brazil

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