Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)

Detalhes bibliográficos
Autor(a) principal: Garcia-Mellado, A.
Data de Publicação: 2002
Outros Autores: Oliva-Paterna, F. J., Carvalho, E. D., Torralva, M.
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UNESP
Texto Completo: http://dx.doi.org/10.1080/11250000209356478
http://hdl.handle.net/11449/18321
Resumo: Catch and selectivity parameters using gillnets were calculated for Schizodon nasutus in the Jurumirim reservoir on the Parana-panema River in southern Brazil. The simple gillnets used were made of monofilament nylon of 30 to 140 mm mesh size an of different heights. The relative abundance of the S. nasutus caught was analysed monthly and a positive relationship was found between catches per unit effort in number and biomass. The relative catches were more abundant for the nets of 40 and 50 mm, mesh size. Catches were characterized by clear temporal variations and a predominance of medium size fish throughout the study period. The selectivity curve of gillnets for S. nasutus in this ecosystem was obtained. The catch obtained was compared with the available catch for each mesh size, and the available catch for a certain length of fish was calculated starting from the theoretical selectivity curve. The 50 mm mesh size gillnet showed the best fit between real and available captures and was considered the most suitable, because a smaller mesh size resulted in a catch of predominantly immature specimens. It is expected that these results will contribute to improving management strategies for conservation of resources. Parameters such as the minimum catch length advisable or the mesh size permitted for a given species are indispensable for such decision-making.
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spelling Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)freshwater fishfishery managementreservoircatches per unit effortselectivitygillnetCatch and selectivity parameters using gillnets were calculated for Schizodon nasutus in the Jurumirim reservoir on the Parana-panema River in southern Brazil. The simple gillnets used were made of monofilament nylon of 30 to 140 mm mesh size an of different heights. The relative abundance of the S. nasutus caught was analysed monthly and a positive relationship was found between catches per unit effort in number and biomass. The relative catches were more abundant for the nets of 40 and 50 mm, mesh size. Catches were characterized by clear temporal variations and a predominance of medium size fish throughout the study period. The selectivity curve of gillnets for S. nasutus in this ecosystem was obtained. The catch obtained was compared with the available catch for each mesh size, and the available catch for a certain length of fish was calculated starting from the theoretical selectivity curve. The 50 mm mesh size gillnet showed the best fit between real and available captures and was considered the most suitable, because a smaller mesh size resulted in a catch of predominantly immature specimens. It is expected that these results will contribute to improving management strategies for conservation of resources. Parameters such as the minimum catch length advisable or the mesh size permitted for a given species are indispensable for such decision-making.Univ Murcia, Dept Anim Biol, Murcia 30100, SpainUniv Estadual Paulista Julio Mesquita Filho, Dept Morphol, Inst Biosci, Botucatu, SP, BrazilUniv Murcia, Dept Anim Biol Zool, Murcia 30100, SpainUniv Estadual Paulista Julio Mesquita Filho, Dept Morphol, Inst Biosci, Botucatu, SP, BrazilUnione Zoologica ItalianaUniv MurciaUniversidade Estadual Paulista (Unesp)Garcia-Mellado, A.Oliva-Paterna, F. J.Carvalho, E. D.Torralva, M.2014-05-20T13:51:18Z2014-05-20T13:51:18Z2002-01-01info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article333-338http://dx.doi.org/10.1080/11250000209356478Italian Journal of Zoology. Camerino: Unione Zoologica Italiana, v. 69, n. 4, p. 333-338, 2002.1125-0003http://hdl.handle.net/11449/1832110.1080/11250000209356478WOS:000180964500008Web of Sciencereponame:Repositório Institucional da UNESPinstname:Universidade Estadual Paulista (UNESP)instacron:UNESPengItalian Journal of Zoology0.597info:eu-repo/semantics/openAccess2021-10-23T07:53:17Zoai:repositorio.unesp.br:11449/18321Repositório InstitucionalPUBhttp://repositorio.unesp.br/oai/requestopendoar:29462024-08-05T23:38:20.226485Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)false
dc.title.none.fl_str_mv Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
title Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
spellingShingle Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
Garcia-Mellado, A.
freshwater fish
fishery management
reservoir
catches per unit effort
selectivity
gillnet
title_short Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
title_full Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
title_fullStr Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
title_full_unstemmed Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
title_sort Catch and selectivity parameters of the anastomid fish Schizodon nasutus using gillnets in the Jurumirim reservoir (São Paulo, Brazil)
author Garcia-Mellado, A.
author_facet Garcia-Mellado, A.
Oliva-Paterna, F. J.
Carvalho, E. D.
Torralva, M.
author_role author
author2 Oliva-Paterna, F. J.
Carvalho, E. D.
Torralva, M.
author2_role author
author
author
dc.contributor.none.fl_str_mv Univ Murcia
Universidade Estadual Paulista (Unesp)
dc.contributor.author.fl_str_mv Garcia-Mellado, A.
Oliva-Paterna, F. J.
Carvalho, E. D.
Torralva, M.
dc.subject.por.fl_str_mv freshwater fish
fishery management
reservoir
catches per unit effort
selectivity
gillnet
topic freshwater fish
fishery management
reservoir
catches per unit effort
selectivity
gillnet
description Catch and selectivity parameters using gillnets were calculated for Schizodon nasutus in the Jurumirim reservoir on the Parana-panema River in southern Brazil. The simple gillnets used were made of monofilament nylon of 30 to 140 mm mesh size an of different heights. The relative abundance of the S. nasutus caught was analysed monthly and a positive relationship was found between catches per unit effort in number and biomass. The relative catches were more abundant for the nets of 40 and 50 mm, mesh size. Catches were characterized by clear temporal variations and a predominance of medium size fish throughout the study period. The selectivity curve of gillnets for S. nasutus in this ecosystem was obtained. The catch obtained was compared with the available catch for each mesh size, and the available catch for a certain length of fish was calculated starting from the theoretical selectivity curve. The 50 mm mesh size gillnet showed the best fit between real and available captures and was considered the most suitable, because a smaller mesh size resulted in a catch of predominantly immature specimens. It is expected that these results will contribute to improving management strategies for conservation of resources. Parameters such as the minimum catch length advisable or the mesh size permitted for a given species are indispensable for such decision-making.
publishDate 2002
dc.date.none.fl_str_mv 2002-01-01
2014-05-20T13:51:18Z
2014-05-20T13:51:18Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://dx.doi.org/10.1080/11250000209356478
Italian Journal of Zoology. Camerino: Unione Zoologica Italiana, v. 69, n. 4, p. 333-338, 2002.
1125-0003
http://hdl.handle.net/11449/18321
10.1080/11250000209356478
WOS:000180964500008
url http://dx.doi.org/10.1080/11250000209356478
http://hdl.handle.net/11449/18321
identifier_str_mv Italian Journal of Zoology. Camerino: Unione Zoologica Italiana, v. 69, n. 4, p. 333-338, 2002.
1125-0003
10.1080/11250000209356478
WOS:000180964500008
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv Italian Journal of Zoology
0.597
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 333-338
dc.publisher.none.fl_str_mv Unione Zoologica Italiana
publisher.none.fl_str_mv Unione Zoologica Italiana
dc.source.none.fl_str_mv Web of Science
reponame:Repositório Institucional da UNESP
instname:Universidade Estadual Paulista (UNESP)
instacron:UNESP
instname_str Universidade Estadual Paulista (UNESP)
instacron_str UNESP
institution UNESP
reponame_str Repositório Institucional da UNESP
collection Repositório Institucional da UNESP
repository.name.fl_str_mv Repositório Institucional da UNESP - Universidade Estadual Paulista (UNESP)
repository.mail.fl_str_mv
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