I. Lein, S. Tveite, B. Gjerde, I. Holmefjord-1997
Aquaculture, 156(3-4) : 291-303 (from Current Contents)
Abstract:
Larvae of Atlantic halibut (Hippoglossus hippoglossus L.) were transferred to nine different salinities (range 20-42 ppt) immediately after hatching, or to five different salinities (range 24-39 ppt) at day 30 post-hatching (p.h.) The experiments were terminated 49 days p.h. (at 5 degrees C); i.e. at first feeding. When newly-hatched larvae were introduced to different salinities, the highest survival rates (69-90%) were obtained at 27-32 ppt. A high yield of normally developed larvae was only obtained within a limited range of salinities (29-34 ppt). Thirty-day-old larvae tolerated a wider range of salinities than newly-hatched larvae, and only larvae transferred to the highest salinity (39 ppt) exhibited significantly reduced survival and yield of functional larvae. Myotomal height, larval dry weight and yolk volume were little influenced by the rearing salinity in either experiment. The buoyancy of halibut larvae was influenced both by the rearing salinity and by larval age.
(Inst Aquaculture Res, N-6600 Sunndalsora, Norway)