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Many-colored abalone (Haliotis diversicolor) is high commercial species in Vietnam. Meanwhile, these resources have been over-exploited, thus, artificial breeding was implemented to restore natural abalone resources. After broodstocking, Many-colored abalones were stimulated reproduction from October – December 2013 at Abalone Seed Center in Bach Long Vi – Hai Phong City. The research results showed that Veliger larvae developed from 11h – 36h after breeding. Abalone juveniles reached to 4.5mm (shell length) at the age of 42 days. Survival rate of abalone juveniles 1-2mm (28 days old) was 0.92%; 3,8%; 24% with density of larvae rearing 7.5; 6.8; and 1.6 larvae/cm2 algae board, respectively. After 2 months (October – November), 30,000 juveniles of 4.5mm shell length; 33,800 juveniles of 3mm shell length; 45,500 juveniles of 2mm shell length; and many small larvae were collected in Bach Long Vi Abalone Seed Center. More than 6,000 juveniles of 4.5mm shell length were released to Bach Long Vi National Marine Protected Areas for conservation in April 2014. The restorable assessment was briefly implemented in June 2015, and almost individuals were found in the average shell length of 3.4cm in Bach Long Vi National Marine Protected Area. This is initial achievement of aquaculture and juvenile rearing to release and protect many-colored abalone resources in Vietnam.

Hoang Dinh Chieu