Abstract

ALVAREZ, Alicia; PASTORI, Maria C; GARRIDO, Gladys G  and  FENOCCHIO, Alberto S. Cytogenetic characterization of Pachyurus bonariensis Steindachner (1879) (Perciformes, Sciaenidae) from Alto Parana River. Rev. cienc. tecnol. [online]. 2014, n.22, pp.28-31. ISSN 1851-7587.

The aim of this work was to characterize the cytogenetic features of the croaker Pachyurus bonariensis (Perciformes, Sciaenidae). Specimens were sampled at three points along the Parana River. Chromosome preparations were obtained by means of cellular suspension from renal tissue. For cytogenetic analysis conventional and differential C and NOR bands staining techniques were applied. We studied 19 individuals of both sexes, from which a diploid number of 48 acrocentric chromosomes was determined (NF=48). There is not evidence of chromosomal sex determination system. NOR banding showed nucleolar organizer regions in pericentromeric regions of a single pair of chromosomes and C banding showed several pericentromeric blocks.

Keywords : Fish Cytogenetics; Sciaenidae; Pachyurus; Parana River.

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