Abstract:

The biochemical genetic characteristic of GIFT, Egypt 92, Sudan 78, Egypt 88 and America strains of Nile tilapia Oreochromis niloticus were analyzed using acrylamide gel electrophoresis. Eighteen loci, including four esterase (EST) loci were examined. All were monomorphic except for two EST loci. There were differences in allele frequencies of EST in the liver tissue among the different strains. The strains clustered into two groups, one containing GIFT and Egypt 92 and the other containing the remaining three strains. The EST-2 locus was found only in GIFT and Egypt 92. This could be used as a genetic marker to differentiate them from other farmed strains of Nile tilapia in China. Isozyme variation in Nile tilapia is low. 

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Date 2001/12/01

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