Estudo preliminar na indução reprodutiva da curimatã comum (Prochilodus cearaensis steindachner, 1911).

Abstract

The species of migratory fish are characterized by displacement along the rivers in rainy periods to perform their reproduction, seasonally allocated. The females of curimatã common (Prochiloduscearaensis), one of these migratory species, present a perfect synchronism between their physiological conditions and the environment, which enables the ovarian development and the final maturation of the ova. In this moment, they are prepared to carry out the ovulation and spawning. However, while in backwater, the mechanism of reproduction is only triggered by anartificial induction, with the employment of pituitary extracts and specific pituitary hormones. Ovulation was inducted in five females with pituitary extract, using a pituitary per kilogram of body weight in two successive doses: the first having 10% of total concentration and the second 90% of the remaining twelve hours after, it was observed two females spawning. After the ovultation induction, three females did not spawn, and, after being sacrificed, the y had ovaries in regression phase, which is a reproductive dysfunction observed during the holding in captivity. The knowledge and understanding of the failures causes observed in reproduction are essential for a profitable intensive exploitation of curimatã common, that presents a great economic regional potential and, if correctly grown, can offer protein of high biological value and nutrition to the consumer.