Karyotypes of three species of marine catfishes from Brazil

the chromosomes of three species of fishes belonging to the family ariidae -netuma barba, genidens genidens and amis parkeri - were studied after conventional giemsa staining. all three species have a diploid chromosome number of 2n = 56. the karyotype comprises 18 metacentric (m), 18 submetacentric (sm), 18 subtelocentric (st) and 2 telocentric (t) pairs for n. barba; 12 m, 20 sm, 20 st and 41 pairs for g. genidens; 16 m, 16 sm, 22 st and 21 pairs for a. parkeri. the results obtained from these three species are compared with each other and with those found in literature.