Voltolin, Tatiana Aparecida [UNESP]Senhorini, Jose Augusto [UNESP]Oliveira, Claudio [UNESP]Foresti, Fausto [UNESP]Bortolozzi, JehudPorto-Foresti, Fábio [UNESP]2014-05-202014-05-202010-03-01Genetica. Dordrecht: Springer, v. 138, n. 3, p. 281-284, 2010.0016-6707http://hdl.handle.net/11449/18521The genus Prochilodus includes individuals ranging in size from medium to large, being highly relevant for commercial and subsistence fishing. Prochilodus species have a diploid number of 2n = 54 chromosomes and up to seven supernumerary (B) microchromosomes. Previous research has shown that B frequency increased drastically in the Mogi-Gua double dagger u river population of Prochilodus lineatus in the early 1980s, whereas it remained about constant in the 1990s. Here we analyses B frequency in this population during the 2003-2007 period and have found that frequency has not changed significantly since 1987, and that these B chromosomes do not show the intra-individual variation in number that characterized them in the 1980s. This indicates that these B chromosomes have been neutralized, after their invasion, through their mitotic stabilization.281-284engMitotic stabilitySupernumerary chromosomesAccumulationNeutralizationArtigo10.1007/s10709-009-9420-9WOS:000274087700001Acesso restrito3815338174165832