I. Ronnestad, O. Lie, R. Waagbo-1997
Aquaculture, 157(3-4) : 337-345 (from Current Contents)
Abstract:
A single batch of Atlantic halibut larvae was reared in floating plastic enclosures, offered natural plankton collected from a lagoon and sampled regularly for measurements of vitamin B-6. At hatching individual whole larvae contained 9.0 +/- 0.2 ng of vitamin B-6, of which 95% was present in the yolk. At the onset of first feeding 50% of the vitamin B-6 present in the yolk at hatching had been transferred to the larval body. There was a relatively constant weight specific content of vitamin B-6 in the larval body from hatching until first feeding at 206 Day degrees post hatch (D degrees PH) at 3.5 +/- 0.3 mu g g(-1) DW. During this period there was a net decline of 2.3 ng vitamin B-6 per larvae. After onset of first feeding the vitamin B-6 content in the larvae continued to decline and reached its lowest level at 300 D degrees PH with 5.0 ng/individual. With continued development the feeding larvae increased their content of vitamin B-6. However, in weight specific terms the content of vitamin B-6 in halibut larvae above a DW weight of 5 mg stabilized at 5.1 +/- 0.2 mu g/g DW, about the same value as the plankton feed offered. The data in this study represents vitamin B-6 status in halibut larvae and planktonic prey in semi-intensive culture systems with a high outcome of metamorphosed larvae and may therefore serve as a basis for feed formulation in intensive farming of Atlantic halibut.
(Dept. Zool., Allegt 41, N-5007 Bergen, Norway)