Cathorops sp has the diploid number of 54 chromosomes. The karyotype comprises lm + sm, 6m, 6sm and 14st pairs. This result is compared with those of other species of Ariidae, mainly Ariopsis felis and Arius dussumieri, found in literature.
Cytogenetic; Chromosomes; Karyotypes; Marine fishes; Ariidae; Cathorops sp; Cananéia; Brazil