Abstract
Production and consumption of Nile tilapia (Oreochromis niloticus) have been growing. Insulin-like growth factor-1 (IGF-1) is a hormone that affects animal weight. Traditional breeding combined with molecular marker technology-assisted selective breeding has long been used to cultivate new fish strains and produce high-quality Nile tilapia. Moreover, molecular markers or genes related to important economic traits can be identified with the help of molecular-assisted selection breeding. A total of 152 Nile tilapia fish fin samples were collected from Janghang fish farm and classified according to their weight and sex. A total of 9 single nucleotide polymorphisms (SNPs) were identified in the Nile tilapia IGF-1 gene in this study. One SNP was located in the promoter region, three in the 5
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