Nude carps, a genotype of common carp which are devoid of scales, have been banned from farmedpopulations of carp in Europe due to both the lethal effect of the N (nude) gene when in homozygousstate, and to the negative pleiotropic effects on growth and survival (especially in harsh conditions) ofthis same gene in the heterozygous state, which produces the nude phenotype. In Madagascar, wherecl…