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dc.contributor.author
Ehrlich, Martín David
dc.contributor.author
Macchi, Gustavo Javier
dc.contributor.author
Madirolas, Adrian Osvaldo
dc.contributor.author
Machinandiarena, Laura
dc.date.available
2017-10-06T18:49:19Z
dc.date.issued
2013-01
dc.identifier.citation
Ehrlich, Martín David; Macchi, Gustavo Javier; Madirolas, Adrian Osvaldo; Machinandiarena, Laura; Vertical distribution of hake Merluccius hubbsi in spawning aggregations in North Patagonian waters of the Southwest Atlantic; Elsevier Science; Fisheries Research; 138; 1-2013; 89-98
dc.identifier.issn
0165-7836
dc.identifier.uri
http://hdl.handle.net/11336/26135
dc.description.abstract
During hydroacoustic surveys for the Argentine hake (Merluccius hubbsi) stock assessments carried out in December 1996, 1998 and 2000 in the main spawning area, a bottom and mid water trawl daylight and darkness sequence per year was selected to study vertical migration. Dense pelagic layers were observed during day and night in the echograms and sometimes a fish layer remained on the bottom at night. During daylight, hake were concentrated mainly near the bottom. The size frequency distributions of males and females differed significantly among the three surveys. Male dominance was observed in 1998 and 2000 surveys. Lack of actively spawning females at midwater levels during darkness may be partly due to reproductive courtship in which females could abandon the shoals during egg fertilization. In the 1996 survey, females dominated both evening and night, before spawning. Just before spawning, sex ratio became similar. Spawning might occur early in the morning because actively spawning females had hydrated oocytes or recent post ovulatory follicles and males were dominant. Also, high densities of recently fertilized eggs were observed early in the morning during the three surveys.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
Elsevier Science
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Merluccius Hubbsi
dc.subject
Hake
dc.subject
Vertical Migration
dc.subject
Spawning Behavior
dc.subject
Reproduction
dc.subject.classification
Bioquímica y Biología Molecular
dc.subject.classification
Ciencias Biológicas
dc.subject.classification
CIENCIAS NATURALES Y EXACTAS
dc.title
Vertical distribution of hake Merluccius hubbsi in spawning aggregations in North Patagonian waters of the Southwest Atlantic
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2017-10-03T17:33:51Z
dc.journal.volume
138
dc.journal.pagination
89-98
dc.journal.pais
Países Bajos
dc.journal.ciudad
Amsterdam
dc.description.fil
Fil: Ehrlich, Martín David. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Macchi, Gustavo Javier. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina
dc.description.fil
Fil: Madirolas, Adrian Osvaldo Madirolas. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina
dc.description.fil
Fil: Machinandiarena, Laura. Instituto Nacional de Investigaciones y Desarrollo Pesquero; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Departamento de Ecología, Genética y Evolución; Argentina
dc.journal.title
Fisheries Research
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1016/j.fishres.2012.07.007
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/http://www.sciencedirect.com/science/article/pii/S0165783612002135
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