Cytogenetic characterization of the piaupara, a fish hybrid resulted from crosses between Leporinus macrocephalus and Leporinus elongatus (Teleostei, Characiformes, Anostomidae) used in Brazilian aquaculture program - Porto-Foresti, F. [UNESP]; Hashimoto, D. T. [UNESP]; Bortolozzi, J. [UNESP]; Senhorini, J. A.; Oliveira, C. [UNESP]; Foresti, F. [UNESP] (Elsevier B.V., 2007)