Heterochromatin localization in the chromosomes of five belontid fishes(Belontiidae, Perciformes)

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Cyiogenetic studies involving conventional Giemsa staining and C-banding were carried out on five fish species viz. Colisa fasciatus, C. lalius, Trichogaster trichopterus trichopterus, T. t. sumatranus and Ctenops nobilis of the family Belontiidae. The diploid numbers of these species were respectively 48, 46, 46, 46 and 44, as previously described. C-band positive (C) heterochromatin was found distributed at variable sites. In Colisa fasciatus, it was centromeric, telomeric, intercalary and whole arm distribution. In C. lalius there was centromeric and telomeric pattern. In Trichogaster trichopterus trichopterus the distribution was centromeric and whole arm. Only centromeric pattern was observed in T t. sumatranus. In Ctenops nobilis, it was centromeric and pericentromeric. C-heterochromatin helped to differentiate the sex chromosome system in Colisa fasciatus where the long arm of the W element (the largest and lone metacentric) of the female was found entirely C band positive. C-heterochromatin in the belontids studied presented a variable pattern.