Marker-5, which is linked to the major sex-determination gene amhy on LG23, has been used for sex genotyping of various strains of Nile tilapia. Marker-5 specifically amplifies fragments of approximately 1,422 and 982 bp of the X and Y chromosomes, respectively. Herein, we evaluated Marker-5 polymorphism in Nile tilapia of Hainan strain, China. Agarose gel electrophoresis showed that in 13 out of 85 female fish, Marker-5 amplified a larger band, distinct
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