Abstract
Prochilodus lineatus is a kind of wide occurrence in the upper basin of the Parana River. Cytogenetically, P. lineatus showed a diploid number of 54 chromosomes of meta/submetacentric types, and the presence of up to nine B chromosomes. In all populations of P. lineatus met polymorphism due to the presence of B chromosomes, where can find three types of B microchromosomes: B-acrocentric, …