Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season

Displacements of Argentine hake Merluccius hubbsi shoals in the spawning area of Patagonia before and during a reproductive season were analyzed. In particular, monthly changes in fish density, sex composition, size structure and spawning location were described for this stock. During October-Novemb...

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Autores principales:	Macchi,Gustavo J, Pájaro,Marcelo, Dato,Claudia
Lenguaje:	English
Publicado:	Universidad de Valparaíso. Facultad de Ciencias del Mar 2007
Materias:	Merlucciidae southwest Atlantic Ocean reproduction migration
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572007000300013
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spelling	oai:scielo:S0718-195720070003000132008-03-11Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive seasonMacchi,Gustavo JPájaro,MarceloDato,Claudia Merlucciidae southwest Atlantic Ocean reproduction migration Displacements of Argentine hake Merluccius hubbsi shoals in the spawning area of Patagonia before and during a reproductive season were analyzed. In particular, monthly changes in fish density, sex composition, size structure and spawning location were described for this stock. During October-November, hake shoals moved from deeper waters to the coast at about 44°S, where spawning took place in December. During January the main reproductive aggregations stayed near the coast (50 m depth) but displaced to the southern area (45°S); in February spawning activity diminished and spent females began to return to deeper waters. In general, this process was first completed by young spawners (35-45 cm TL), which have a breeding season shorter than the old females. We observed that males arrived at the spawning area first and remained there for a longer period than females. During the reproductive period skewed sex ratios in different sampling sites were observed. These differences in sex composition were attributable to: 1) local segregation produced by the reproductive behavior of hake, in which males form groups with a single female, and 2) migration of spent females to deeper waters, which causes male-biased samplings in coastal areasinfo:eu-repo/semantics/openAccessUniversidad de Valparaíso. Facultad de Ciencias del MarRevista de biología marina y oceanografía v.42 n.3 20072007-12-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572007000300013en10.4067/S0718-19572007000300013
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Merlucciidae southwest Atlantic Ocean reproduction migration
spellingShingle	Merlucciidae southwest Atlantic Ocean reproduction migration Macchi,Gustavo J Pájaro,Marcelo Dato,Claudia Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season
description	Displacements of Argentine hake Merluccius hubbsi shoals in the spawning area of Patagonia before and during a reproductive season were analyzed. In particular, monthly changes in fish density, sex composition, size structure and spawning location were described for this stock. During October-November, hake shoals moved from deeper waters to the coast at about 44°S, where spawning took place in December. During January the main reproductive aggregations stayed near the coast (50 m depth) but displaced to the southern area (45°S); in February spawning activity diminished and spent females began to return to deeper waters. In general, this process was first completed by young spawners (35-45 cm TL), which have a breeding season shorter than the old females. We observed that males arrived at the spawning area first and remained there for a longer period than females. During the reproductive period skewed sex ratios in different sampling sites were observed. These differences in sex composition were attributable to: 1) local segregation produced by the reproductive behavior of hake, in which males form groups with a single female, and 2) migration of spent females to deeper waters, which causes male-biased samplings in coastal areas
author	Macchi,Gustavo J Pájaro,Marcelo Dato,Claudia
author_facet	Macchi,Gustavo J Pájaro,Marcelo Dato,Claudia
author_sort	Macchi,Gustavo J
title	Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season
title_short	Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season
title_full	Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season
title_fullStr	Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season
title_full_unstemmed	Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season
title_sort	spatial variations of the argentine hake (merluccius hubbsi (marini, 1933)) spawning shoals in the patagonian area during a reproductive season
publisher	Universidad de Valparaíso. Facultad de Ciencias del Mar
publishDate	2007
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0718-19572007000300013
work_keys_str_mv	AT macchigustavoj spatialvariationsoftheargentinehakemerlucciushubbsimarini1933spawningshoalsinthepatagonianareaduringareproductiveseason AT pajaromarcelo spatialvariationsoftheargentinehakemerlucciushubbsimarini1933spawningshoalsinthepatagonianareaduringareproductiveseason AT datoclaudia spatialvariationsoftheargentinehakemerlucciushubbsimarini1933spawningshoalsinthepatagonianareaduringareproductiveseason
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Spatial variations of the Argentine hake (Merluccius hubbsi (Marini, 1933)) spawning shoals in the Patagonian area during a reproductive season

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