<b>Condition factor and reproductive aspects of females of <em>Pimelodella</em> cf. <em>gracilis</em> (Osteichthyes, Siluriformes, Pimelodidae) in Amambai River, Mato Grosso do Sul State</b> - DOI: 10.4025/actascibiolsci.v28i2.1030

Abstract

The aim of this study is to describe the seasonal variations of condition factor and of the gonadal development cycle of Pimelodella cf. gracilis in Amambai River (MS, Brazil). The length and weight of 232 individuals were measured to calculate the Allometric Condition Factor. For the females (n=162), we also obtained the ovarian weight and the gonadal maturity stages in order to calculate the GSI and the relative frequency (%) of this stages at each season of the year. Results indicate that the highest GSI values were registered in spring and summer. Thus, we concluded that the spawning season of this species occurs between October and April. However, it was not possible to identify more precisely when this event occurs. The highest values of condition factor were observed in summer, as a probable consequence of the more intensive feeding activity that individuals demonstrate during the spring.