Electrophoretic evidence for extensive hybrid gene introgression into commercialOreochromis niloticus(L.) stocks in the Philippines*

摘要

Abstract.The usefulness of isozyme and protein markers in identifying tilapia species and their hybrids is demonstrated Genetic characterization ofOreochromis niloticuspopulations from commercial farms, experimental stations, and government hatcheries in Luzon, Visayas and Mindanao in the Philippines indicates well‐established introgression withO mossambicusGenetic differentiation of theO niloticusstocks, measured by Nei's genetic distance, was highly correlated withO mossambicusgene content The implications of these results for tilapia genetic improvement are discusse