Data/hora: 05/06/2024 17:10:43

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