Resumen

NAVARRO, Rodrigo Diana et al. Morphometric comparison and somatic indexes of lambari prata (Astayanax scabripinnis Jerenyns, 1842) in different culture systems. Zootecnia Trop. [online]. 2006, vol.24, n.2, pp.165-176. ISSN 0798-7269.

This study was carried out to compare the influence of sex on Astyanax scabripinnis morfometric and reproductive indexes. Three fingerlings (live weight 5.07 ± 0.14) were assigned to three treatment groups: T1 male only; T2 female only, and T3 both sex. Female parameters measured were trunk length, head length, pre-anal distance, and body height. Significant differences for total and body length for cultivated females was observed in presence and absence of the male in relation to the cultivated males in presence and absence of the females. Length of the trunk, length of the head, and pre-anal were not significantly different between the females. Females in the absence of males had significant differences in relation to the males cultivated in absence and presence of the females. For height of the body, significant differences among treatments were not found. The results also revealed significant changes on the gonadossomatic index of T2 females in comparison to males from T1 and T3 groups. In the other hand, the hepatossomatic index did not show any significant change amongst groups.

Palabras clave : Lambari prata; Astyanax scabripinnis; reprodutive index; morfhometry.