Abstract
Leporinus piau Fowler, 1941 is important as forage fish and in the fishing of the Sao Francisco River basin. Females of this species were induced to spawning by the application of two doses of crude carp pituitary extract (CCPE) (0.5 and 5 mg.kg-1 of CCPE, with an interval of 14 h between doses). The water temperature of the tanks was maintained between 25 and 26°C. The oocytes extrusion occurred from 8 to 8.5 hours after second dose of CCPE. The females signal the timing of spawning and more than 71% responded positively to treatment releasing fertile eggs. Eggs of L. piau are free, demersal, round, opaque and gray-brownish. The gonadosomatic index average was 17.8% for mature females. The larvae hatched 21 h after fertilization of eggs, with water temperature maintained between 23 and 24 °C in the incubators. KEY WORDS: Fecundity, hypophysation, Leporinus piau, oocyte and larvae morphometry, Sao Francisco River, reproduction.
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