Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil

Commercial exploitation of the Argentine shortfin squid (Illex argentinus) was virtually non-existent in Brazilian waters until 2000 when foreign trawlers initiated their operations on slope grounds as part of a government-induced chartering program. Since then, the species has been included among t...

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Autores principales:	Alvarez Perez,José Angel, Nascimento Silva,Tiago, Schroeder,Rafael, Schwarz,Richard, Silvestre Martins,Rodrigo
Lenguaje:	English
Publicado:	Pontificia Universidad Católica de Valparaíso. Facultad de Recursos Naturales. Escuela de Ciencias del Mar 2009
Materias:	ommastrephid squid Illex argentinus slope trawl fishery southern Brazil
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-560X2009000300011
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spelling	oai:scielo:S0718-560X20090003000112010-03-17Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off BrazilAlvarez Perez,José AngelNascimento Silva,TiagoSchroeder,RafaelSchwarz,RichardSilvestre Martins,Rodrigo ommastrephid squid Illex argentinus slope trawl fishery southern Brazil Commercial exploitation of the Argentine shortfin squid (Illex argentinus) was virtually non-existent in Brazilian waters until 2000 when foreign trawlers initiated their operations on slope grounds as part of a government-induced chartering program. Since then, the species has been included among the targets of a developing slope trawl fishing off southeastern and southern Brazil. Biological samples were collected from commercial catches of 25 national and seven foreign (chartered) trawlers between 23°-33°S and 170-740 m depth. These samples represent two periods of the commercial exploitation of Illex argentinus in Brazil: 2001-2003, when both chartered and national trawlers operated simultaneously, and 2006-2007, when only national vessels continued to exploit I. argentinus along with other slope stocks. Catches contained immature and ma-turing squid throughout the year, as well as at least two distinct, fully mature, spawning groups: one composed of small-sized males and females present year-round on the shelf-break/ upper slope (< 400 m), and the other consisting of large squid present only in austral winter-spring in southern (26°-29°S ) and deep fishing grounds (400-700 m). The latter group has sustained the large winter catches reported since 2000 and the large sizes and concentrations of the specimens sparked the interest of the fishing industry as a potential target of the slope fishery. The reproductive attributes and temporal/ spatial distribution patterns of winter spawners support the hypothesis that relates this group to migrating concentrations of a north Patagonian shelf stock. If confirmed, the present data would underscore the need to consider multinational shared stock management strategies in the SW Atlantic.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=S0718-560X2009000300011en
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	ommastrephid squid Illex argentinus slope trawl fishery southern Brazil
spellingShingle	ommastrephid squid Illex argentinus slope trawl fishery southern Brazil Alvarez Perez,José Angel Nascimento Silva,Tiago Schroeder,Rafael Schwarz,Richard Silvestre Martins,Rodrigo Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil
description	Commercial exploitation of the Argentine shortfin squid (Illex argentinus) was virtually non-existent in Brazilian waters until 2000 when foreign trawlers initiated their operations on slope grounds as part of a government-induced chartering program. Since then, the species has been included among the targets of a developing slope trawl fishing off southeastern and southern Brazil. Biological samples were collected from commercial catches of 25 national and seven foreign (chartered) trawlers between 23°-33°S and 170-740 m depth. These samples represent two periods of the commercial exploitation of Illex argentinus in Brazil: 2001-2003, when both chartered and national trawlers operated simultaneously, and 2006-2007, when only national vessels continued to exploit I. argentinus along with other slope stocks. Catches contained immature and ma-turing squid throughout the year, as well as at least two distinct, fully mature, spawning groups: one composed of small-sized males and females present year-round on the shelf-break/ upper slope (< 400 m), and the other consisting of large squid present only in austral winter-spring in southern (26°-29°S ) and deep fishing grounds (400-700 m). The latter group has sustained the large winter catches reported since 2000 and the large sizes and concentrations of the specimens sparked the interest of the fishing industry as a potential target of the slope fishery. The reproductive attributes and temporal/ spatial distribution patterns of winter spawners support the hypothesis that relates this group to migrating concentrations of a north Patagonian shelf stock. If confirmed, the present data would underscore the need to consider multinational shared stock management strategies in the SW Atlantic.
author	Alvarez Perez,José Angel Nascimento Silva,Tiago Schroeder,Rafael Schwarz,Richard Silvestre Martins,Rodrigo
author_facet	Alvarez Perez,José Angel Nascimento Silva,Tiago Schroeder,Rafael Schwarz,Richard Silvestre Martins,Rodrigo
author_sort	Alvarez Perez,José Angel
title	Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil
title_short	Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil
title_full	Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil
title_fullStr	Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil
title_full_unstemmed	Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil
title_sort	biological patterns of the argentine shortfin squid illex argentinus in the slope trawl fishery off 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=S0718-560X2009000300011
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Biological patterns of the Argentine shortfin squid Illex argentinus in the slope trawl fishery off Brazil

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