Data/hora: 05/06/2024 08:18:22

Provedor de dados: | 83
País: | Brazil
Título: | Estimating size at first maturity (L50) from Gonadossomatic Index (GSI) data
Autores: | Fontoura,Nelson F.; Braun,Aloísio S.; Milani,Paulo Cesar C.
Data: | 2009-06-01
Ano: | 2009
Palavras-chave: | Fish; Reproduction; Patos lagoon; Logistic function.
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.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000200013
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252009000200013
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.7 n.2 2009
Fonte: | info:eu-repo/semantics/openAccess