Abstract
The study aims to evaluate the effects of salinity and lighting mode on the development of embryogenesis, hatching rate were observed of hybrid grouper ELEC (♂ Epinephelus lanceolatus x ♀ Epinephelus coioides) was carried out from July to October in 2022. This study different salinity was a completely randomized design with 5 treatment (23, 28, 31, 35 and 37 ppt) and different light time was a completely randomized design with 5 treatments (10, 12, 14, 16 and 18 hour) with 3 replicates. The diameter of fertilized eggs measured 0.857±0.150 mm. Hybrid grouper eggs undergo many times of cleavage, hatching time 18h30‟ with the fertilization and hatched rates were 80-85%, respectively. Newly hatched larvae obtained 15,342; 1.35-1.6 mm in size, hatched from 18,050 fertilized eggs. The suitable salinity for incubation of hybrid grouper eggs is in the range of 31 to 35 ‰ with high hatching rate of 80 - 85% and low malformation rate of 0%. The results indicated that there were no significant effects of lighting time on the embryonic stages. Thus, the salinity should be maintained at 31 to 35 ‰, hatched rates were 80-85%. From the above results, we could conclude that hybrid grouper ELEC is predicted that artificial reproduction process and breeding product will be applied on practice in marine of Vietnam in the future.
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