Aspectos da biologia reprodutiva de Astyanax jacuhiensis (COPE, 1894) na Barragem da Estância Santa Ana, Pampa Brasileiro

Abstract

The aim of this study was elucidate the reproductive biology of Astyanax jacuhiensis (COPE 1984), in the Santa Ana property dam, Uruguaiana, Brazil. Thus, the research in "lambari" reproductive aspects will contribute with the studies in Pampa region toward the management of the fish species from the Uruguay River Basin and cultivation of the species in captivity. The collect of individuals was performed monthly from April (2016) to Mar (2017), reaching a total of 193 individuals, subdivided in 129 females and 64 males. The reproductive period was chosen by the analysis of monthly variance of the following parameters: gonadosomatic index (IGS), hepatosomatic index (SIH), gonadal conditioning factor (ΔK), macroscopic analysis of gonadal growth staging, fecundity and spawning time. The analysis showed that the A. jacuhiensis has the reproductive periods for females and males from September to January. The mean fecundity was the 3,245 oocytes, with single spawing. Additionally, SIH and ΔK also may be used as index for reproductive period.