Aspectos da reprodução induzida do acari pão Hypancistrus sp. “L-333” (Siluriformes: Loricariidae) em cativeiro

Abstract

The Pará State is the main exporter of fish species of the Loricariidae family, popularly called "acaris, bodós or cascudos" and world famous by the "L-Code" or "L-numbers". The acari pão Hypancistrus sp. "L-333" is much captured and marketed by exporters of ornamental fish in the region, but has grieve with the construction of dam project in the Xingu River region. Thus, adaptations or creations cultivation techniques of this species in captivity are necessary, since these technological package for growing fish in captivity is not yet mastered in Brazil. In this context, this work studied aspects of breeding induced the acari pão Hypancistrus sp. "L-333" in captivity. The fish were purchased in natural environment, transported and acclimated in an export company of ornamental fish located in Belém, Pará, Brazil. Reproductive groups formed by two females and one male were evaluated for secondary sexual dimorphism, influence the use of buserelin acetate in reproductive behavior and the use of buserelin acetate in the reproductive performance of acari bread Hypancistrus sp. "L-333" in captivity. Regarding the secondary sexual dimorphism observed in acari pão Hypancistrus sp. "L-333" between the end of the base of the dorsal fin to the end of the caudal peduncle, males used in this study had more developed odontodes than females, a fact that was confirmed by histological analysis of fish with odontodes most developed being males and least developed be females. Regarding the influence of the use of buserelin acetate in the reproductive behavior was observed that fish receiving buserelin acetate showed behavioral changes that indicate ovulation prior to spawning. And finally, on the use of buserelin acetate in reproductive performance, it was found that significant differences in relation to the latency time, females spawned by treatment, spawning percentage living larvae taken from the caves, living youth 30 days after spawning and survival of juveniles to 30 days after spawning. However, there were no significant differences between treatments on mortality of juveniles 30 days after spawning. Thus, this study showed that the use of buserelin acetate in acari pão Hypancistrus sp. "L-333" can help many people to play this species in captivity, which will allow the reduction in their natural environment in capture and youth to be obtained that can be destinations trade in ornamental fish.