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Improvement of Larval Rearing Technique for Humpback Grouper, Cromileptes altiverlis

Document format: pdf

Publisher: Network of Aquaculture Centres in Asia-Pacific

Creation date: September 2003

Breeding of humpback grouper, Cromileptes altivelis has been underway in Gondol Research Institute for Mariculture Indonesia since 1995. Techniques for mass seed production of this fish were successful in late 1998 under research collaboration with JICA on the Multi-species Hatchery Project and the ACIAR Improved Hatchery Technology for Groupers Project and transferred to private hatcheries including backyard hatcheries in 1999. The techniques, which are based on natural spawning in captivity and the intensive rearing of larvae in tanks, are described in detail by Sugama et al. (2001). About one million juveniles (4-5 cm TL) were produced in 2000 and more than three million juveniles in 2001. Egg production is no longer a constraint since private hatcheries routinely produce billions of eggs from domesticated broodstock. In the research result carried in Research Institute, Sugama et.al. (2001) reported the highest known survival of 53.9 % in 10-ton tank on day 50 for this species. However, in recent times survival has been highly variable (low and irregular) due to various factors, chiefly due to infection with Viral Nervous Necrosis (VNN) infection (Koesharyani et.al.2001). This paper summarizes the larval rearing techniques that has been practicing in grouper hatcheries within Indonesia.

Key Words: NACA • Humpback Grouper • Indonesia • Larvae Production • Seed and Fry Production • FAO