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No Thumbnail AvailableProjectSeabass (Lates calcarifer) culture in Thailand
Regional Seafarming Development and Demonstration Project
1988Also available in:
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No Thumbnail AvailableProjectMass production of seabass, Lates calcarifer (Bloch) by environmental manipulation
Establishment of a Network of Aquaculture Centres in Asia
1986Also available in:
No results found.Seabass, Lates calcarifer (Bloch), is an important aquaculture species in many Southeast Asian countries. The fish has been successfully spawned by hormonal manipulation since 1973. To minimize the use of expensive hormones as well as stress on the fish through handling and hormonal injections, environmental manipulation, mainly through control of salinity and temperature to induce spawning in captivity was used. With this method, some 50–100 million fry and fingerlings were produced per year Co ntinuously at the Satul Fisheries Station in Satul, Thailand. This report describes the methodology of environmental manipulation, pre-spawning behavior, larval rearing techniques and monthly production the seabass. -
No Thumbnail AvailableProjectInduced spawning and larval rearing of grouper (Epinephelus salmoides Maxwell)
Establishment of a Network of Aquaculture Centres in Asia
1986Also available in:
No results found.Broodfish of grouper (Epinephelus salmoides) were induced to spawn by hormonal induction. The hormones used for this experiment were HCG + pituitary gland (PG) and LRH-a. The results showed that at the dosages of 500 IU HCG + 3 mg of PG per kg of fish for first injection and 1,000 IU HCG + 3 mg of PG per kg of fish at the final injection at an interval of 24 hours, the treated fish spawned naturally in a spawning tank 12 hours after the final injection. At lower dosages of 500 IU HCG + 3 mg PG a t 12-hour intervals or 500 IU HCG + 3 mg PG at 24-hour intervals or using 10 mg LRH-a at 12-hour intervals, the eggs can be artificially fertilized only by stripping. * This paper was presented at the First Asian Fisheries Forum 24–30 May, 1986 Manila, Philippines. ** Present Address : FAO/UNDP Seafarming Development Project (INS/81/008), FAO, Jakarta, Indonesia. The larval rearing experiment ws conducted in a 250-liter fiberglass tank at the stocking density of 2,500 larvae per tank. Feed s used in this experiment were : (a) Isochrysis + sea urchin eggs; (b) Isochrysis + Brachionus; and (c) Tetraselmis + Brachionus. The experiment results showed that newly hatched larvae fed with Isochrysis mixed with sea urchin eggs and then switched to Brachionus on day 10 gave the best survival rate (9% at day 30).
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