Data/hora: 13/06/2024 14:30:48

Provedor de dados: | 83
País: | Brazil
Título: | Predicting size at first sexual maturity from length/weight relationship: a case study with an Amazonian catfish
Autores: | Freitas,Tiago Magalhães da Silva; Almeida,Vitor Hudson da Consolação; Montag,Luciano Fogaça de Assis; Fontoura,Nelson Ferreira.
Data: | 2016-01-01
Ano: | 2016
Palavras-chave: | Amazonia; Auchenipteridae; Fish reproduction; Growth pattern; Sexual maturity.
Resumo: | ABSTRACT Relationship between length and weight (LWR) is used to describe aspects concerning the life cycle of fish, but does not considers possible changes during the lifetime mainly due to the sexual maturation. Thus, this study aims to identify the size at first maturity of Auchenipterichthys longimanus (Siluriformes: Auchenipteridae) and infer if the reproductive engagement could change growth pattern, concerning the LWR. Estimates of the size at first maturity (L  50 ) were made by visual identification of gonadal development and through the gonadosomatic index (G  SI ). L  50 was estimated as 12.5 cm for males and 13.0 cm for females when applied visual identification of gonads development. L  50 estimates increased to 13.05 cm for males and 13.7 cm for females when estimated from G SI values. LWR was adjusted by using a regular power function and through the polyphasic growth model, with proportionality and allometric coefficients changing in a two phases. The results indicate differences in the growth pattern concerning males and females, as well as polyphasic growth. The change in the growth pattern of the polyphasic LWR was estimated at 11.42 cm for males and 12.53 cm for females, suggesting that changes in the growth pattern can sign-out the attainment maturity in this catfish.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252016000400203
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/1982-0224-20150152
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.14 n.4 2016
Fonte: | info:eu-repo/semantics/openAccess