C-Banding and Nucleolar Organizer Regions of Sphoeroides greeleyi (Tetraodontidae, Tetraodontiformes)

Abstract

Chromosome studies in terms of C-banding and nucleolar organizer regions were carried out on Sphoeroides greeleyi (Teleostei, Tetraodontiformes, Tetraodontidae), a fish that occurs along the coast of the State of Rio de Janeiro, Brazil. C-banding, made with barium hydroxide, showed that constitutive heterochromatin is centromeric in most of the chromosomes, as well as and also telomeric in two of the largest pairs. Silver nitrate staining evidenced a pair of nucleolar organizer regions in terminal position on a acrocentric pair, identified as the ninth pair of the complement. © 2002 Taylor & Francis Group, LLC.