| Registro completo |
| Provedor de dados: |
Neotropical Ichthyology
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| País: |
Brazil
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| Título: |
Estimating size at first maturity (L50) from Gonadossomatic Index (GSI) data
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| Autores: |
Fontoura,Nelson F.
Braun,Aloísio S.
Milani,Paulo Cesar C.
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| Data: |
2009-06-01
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| Ano: |
2009
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| Palavras-chave: |
Fish
Reproduction
Patos lagoon
Logistic function
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| Resumo: |
Correct estimates of size at first maturity (L50) are useful for fish stock management and different methods have been proposed. In this study we propose the use of a modified logistic to estimate L50, including a variable asymptote (A). We also test the use of the Gonadossomatic Index (GSI) as a flag to establish the reproductive status of each female fish. The method is demonstrated using GSI data for four Neotropical fish species: Characiformes: Astyanax fasciatus (n = 473) and Oligosarcus robustus (n = 297); Siluriformes: Loricariichthys anus (n = 427) and Trachelyopterus lucenai (n = 195). The results were stable enough to propose this method be used for other fish species with different life histories and with a relatively unconstrained sampling programs. Nevertheless, a wide scale test program is desirable to identify any possible bias in this approach.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200013
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| Editor: |
Sociedade Brasileira de Ictiologia
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| Relação: |
10.1590/S1679-62252009000200013
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| Formato: |
text/html
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| Fonte: |
Neotropical Ichthyology v.7 n.2 2009
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| Direitos: |
info:eu-repo/semantics/openAccess
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