Data/hora: 06/06/2024 11:08:45

Provedor de dados: | 83
País: | Brazil
Título: | Reproductive biology of the Neotropical electric fish Brachyhypopomus draco (Teleostei: Hypopomidae) from southern Brazil
Autores: | Schaan,Andrea B.; Giora,Júlia; Fialho,Clarice B.
Data: | 2009-01-01
Ano: | 2009
Palavras-chave: | Reproduction; Gymnotiformes; Abiotic factors; Laguna dos Patos system; Parque Estadual de Itapuã.
Resumo: | The reproductive biology of a population of the weakly electric fish Brachyhypopomus draco from southern Brazil is described. Information is provided on the establishment of the reproductive period in this species and its relations with environmental and feeding factors, as well as on the absolute and relative fecundities, spawning type, sex ratio and sexual dimorphism. The species exhibits a relatively long reproductive period, a relative fecundity of 0.173 oocytes per mg of female total weight, and fractional spawning. The sex ratio did not differ from 1:1 during all sampled months. Sexual dimorphism related to hypertrophy of the male's distal portion of caudal filament was observed and males grew to greater lengths than females. Male gonadosomatic index (GSI) was significantly related to water depth, oxygen saturation and temperature. Female GSI was significantly related to water depth and hepatosomatic index.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252009000400023
Editor: | Sociedade Brasileira de Ictiologia
Relação: | 10.1590/S1679-62252009000400023
Formato: | text/html
Fonte: | Neotropical Ichthyology  v.7 n.4 2009
Fonte: | info:eu-repo/semantics/openAccess