TÓM TẮT NỘI DUNG:

Grow-out performance of the diallel crosses were similar between two environments. The cross FE_FE and FD_MM grown best in both environments: for FE_FE, harvest weight was 349.7 ± 8.8 in freshwater and 228.6 ± 4.8 in brackish water; for FD_MM, harvest weight was 328.2 ± 5.4 (freshwarter) and 117.0 ± 3.5 (brackish water). The cross FE_MM had highest harvest weight in freshwater (350.9) but was only number four in brackish water. Similarly, the cross FM_ME grown best in barackish water, but was number four in freshwater. In general, the Ecuador strain grown best in both environments. In addition, DNA analysis revealed genetic diversity of the Ecuador strain. The first breeding program for red tilapia, conducted by the Research Institute for Aquaculture No.2, has obtained positive results. The base population (G0), consisted of 1,500 fish, was established using 1,006 fish of the F2-Ecuador (h2 = 0.25 ± 0.09), and 494 fish from 16 diallel crosses (F1-Ecuador, Malaysian, Taiwanese, and Thai strains). At the moment, growth performance of 202 families of G1 generation are being analysed. The Israeli strain will soon be introduced into G2 to further increase genetic variation of the RIA2 red tilapia population.