Genetic variability in three populations of Hypostomus hermanni (Teleostei: Loricariidae) found in the basins of Ivaí River, Tietê River, and Sapucaí-Mirim River of Brazil
INTRODUCTION
The Neotropics (South and Central America) are considered the region of the greatest diversity of fish populations on the entire planet, with approximately 6000 of the 13,000 species of freshwater fish found here. Of these, 4475 species have already been described and it is estimated that probably 1550 species are yet to be described (Reis et al., 2003; Ferraris, 2007).