Microsatellites from genes show polymorphism in two related Oreochromis species

Six microsatellites were detected in the IGF-II, GH2, prolactin I and insulin genes of Mozambique tilapia (Oreochromis mossambicus) and Nile tilapia (Oreochromis niloticus) by screening DNA sequences deposited to GenBank. Genotyping of 24 individuals from each species revealed that all six microsatellites were polymorphic in both species. In Mozambique tilapia the number of alleles ranged from 3 to 17 (average 9.8), whereas in Nile tilapia the range was 4–21 (average 10.5). The range of expected heterozygosity values were 0.44–0.95 (average 0.79) in Mozambique tilapia, and 0.52–0.96 (average 0.73) in Nile tilapia