Caracterização citogenética de hoplias malabaricus capturados na Região do Médio e Baixo Paraguaçu

Abstract

Cytogenetics is the study of chromosome number as well as ways chromosome morfology. There are techniques for visualization of chromosomes obtained from metaphases. These techniques can be with conventional Giemsa and / or differential staining Nucleolar Organizer Regions and C. Banda. The karyotypic variability in fish shows the need to systematically analyze their groups. The goal of the present work was to characterize cytogenetically H. Malabaricus. This analysis was performed using samples in Tupiaçu district of Cabaceiras do Paraguaçu. It was systematized the number karyotype of H. malabaricus 2n = 40, found Nucleolar Organizer Regions in the telomeric region of chromosomes. These results corroborate other studies, which mention that H. malabaricus is in a complex of species, with five different karyotypes ranging from 2n = 39 to 2n = 42. And so it is necessary a taxonomic revision of the species, since morphological and cytogenetic say there may be several cryptic species within a single classification.