Electrophoresis 222 developed gonads. These facts reveal that conditions on this region are less favorable to they reproduction. There are two possible factors, among others caused by hydroelectric station, as a lower water temperature and oxygenation. The Prochilodontidade family is composed by iliophagous-migratory fish, that swimming upstream to deposit their eggs every year in the end of dry season. Prochilodus argenteus, is an endemic fish specie, that migrate to the water spring for the

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... awning. It is called curimbatá, and today is endangered specie of fish from São Francisco basin. The adults of this species are migratory in time of piracema (November to February) and the São Francisco basin river rough relief and the fish have to use of essentially anaerobic metabolism (it has pulled out) to cross these obstacles.