Resumen

NAVARRO, Rodrigo Diana et al. Influence of the sex in the performance of lambari silver (Astyanax scabripinnis, Jenyns, 1842) . Zootecnia Trop. [online]. 2003, vol.21, n.4, pp.359-369. ISSN 0798-7269.

Summary The objective of the present study was to evaluate the influence of sex in the lambari performance. Fingerlings (300) of Lambari silver (Astyanax scabripinnis) were used with initial mean weight 5.07 ± 0.14 g and an average length of 5.88 ± 0.033 cm for males and the females had an initial weight of 6.67 ± 0.07g and a mean length of 6.28 ± 0.08 cm. A complete randomized experimental design was used with 3 treatments: T1: male separated from the female; T2: female separated from males presence, and T3: male and female together, with 3 repetition and 30 fingerlings in each aquarium, maintained in a aquarium of 1,000 l. The temperature of the morning had a mean of 24.0 ± 3.46 and 30.0 ± 0.67 ºC in the afternoon. The results demonstrate that the male cultivated alone obtained an inferior performance to the male and female together cultivated. The females cultivated alone showed a better performance in relation to the females in the presence of males, but for the total length there were no significant differences. The total length was significant in the T3 in relation to the T1.The viscerossomatic index obtained a significant result in the animals cultivated separated in relation to the animals cultivated together. For the carcass yield, the animals of the T1 resulted in higher and significant differences than the other treatments. The rate of specific growth of the animals in T2 treatment was the highest and the survival was significant higher for the T1 treatment. For the production of Lambari is recommended to cultivate lambaris males separated from the females.

Palabras clave : Lambari; Astyanax scabripinnis; Lambari; Astyanax scabripinnis; sex; performance.