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Karyotypic diversification in Hoplias malabaricus (Osteichthyes, Erythrinidae) of the São Francisco and Alto Paraná basins, Brazil

Jorge A. Dergam^I; Luiz A.C. Bertollo^II

^IDepartamento de Biologia Animal, Universidade Federal de Viçosa, 36570 Viçosa, MG, Brasil. Send correspondence to J.A.D.
^IIDepartamento de Ciências Biológicas, Universidade Federal de São Carlos, 13560 São Carlos, SP, Brasil

ABSTRACT

Cytogenetic studies were made on two fish populations from the Monjolinho reservoir (Alto Paraná basin) and from the São Francisco river, belonging to the Hoplias malabaricus species group, widely distributed throughout Latin America. They possess different diploid numbers: 40 for both sexes in the São Francisco form and 39/40 for males and females, respectively, in the Monjolinho population. The former showed no differentiation of sex chromosomes, while the latter confirmed the X₁X₁X₂X₂/X₁X₂Y mechanism reported by Bertollo et al. (Cytologia 48: 1-12, 1983) for other populations of that basin. In both populations, NOR sites were multiple, telomeric and small, and C-banding was predominantly centromeric. The implications of the karyotypic diversity are discussed.

Keywords: Karyotypic; Hoplias malabaricus; Osteichthyes; Brazil.

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