The present invention relates generally to polymorphisms, and in particular single nucleotide polymorphisms (SNP) associated with late onset of sexual maturation in rainbow trout (Oncorhynchus mykiss). In particular, the present invention provides methods for predicting late onset of sexual maturation in rainbow trout, methods for selecting a rainbow trout having late onset of sexual maturation and kit suitable for carrying out said methods. The present invention further provides rainbow trout cells, sperm and unfertilized eggs carrying at least one allele conferring late onset of sexual maturation in their genome.
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