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Multiple sex chromosomes in south atlantic fish, Brevoortia aurea, clupeidae

 

 

Mario Jorge Ignacio BrumI; Pedro Manoel Galetti Jr.II; Margaret Maria de Oliveira CorrêaI; Cecilia Teixeira de AguilarI

IDepartamento de Zoologia, Instituto de Biologia, Universidade Federal do Rio de Janeiro, 21941 Rio de Janeiro, RJ, Brasil. Send correspondence to M.J.I.B.
IIDepartamento de Genética, Universidade Federal de São Carlos, 13560 São Carlos, SP, Brasil

 

 

ABSTRACT

Sex chromosomes in Clupeidae fish are described for the rust time. An X1X2Y multiple sex chromosome system is related for Brevoortia aurea of the South Atlantic. Mitotic preparations showed 2n-46 in female specimens and 2n-45 in all males analyzed. Chromosome anus were constant in both-sexes (NF-50). A centric fusion between two median acrocentric chromosomes seems to have developed a large metacentric in the males, which is absent in the female. Testicular analyses showed a typical trivalent and two different haploid numbers (n-22 and n-23) in the meiotic products.

Keywords: Multiple sex chromosomes; Fish; Brevoortia aurea.

 

 

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