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Cytogenetic studies on fishes on the family pimelodidae (Siluroidei)

Ana Lúcia Dias; Fausto Foresti

Departamento de Morfologia, Instituto de Biociências, Universidade Estadual Paulista "Júlio de Mesquita Filho", 18618-000 Botucatu, SP, Brasil. Send correspondence to A.L.D.

ABSTRACT

Four fish species of the family Pimelodidae were analyzed. Bergiaria westermanni and two different Pimelodus species have the same diploid chromosome number (2n - 56). Despite some differences in chromosome structure, these species are highly similar in karyotype and differ from Pimelodella sp., which presents a reduction in chromosome number to 2n - 46. The data confirm the extensive chromosome variability existing in this family, characterized by intraindividual and/or population polymorphisms of a structural nature which may or may not be sexlinked, and by the presence of supernumerary chromosomes.

Keywords: Cytogenetic; Fishes; Siluroidei.

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