S. Bolla, O.H. Ottesen-1998
Aquaculture Research, 29: 203-209
Abstract:
The effects of incubation salinity on survival and morphological development of yolk sac larvae of Atlantic halibut, Hippoglossus hippoglossus (L.), were studied at two salinities, 35.5 ppt and 32.3 ppt. Yolk sac larvae incubated at 35.5 ppt developed early tail deformities before 50 day-degrees (9 days post-hatch). However, the incidence and severity of mouth deformity was not influenced by salinity. The cumulative mortality up to first feeding was 17% when the larvae were incubated at 35.5 ppt compared to 7% at 32.3 ppt. A broad variation between the different larval groups was noted in the extent of injuries induced by the higher salinity. Therefore, salinity must be considered as a critical environmental parameter for the yolk sac larvae of Atlantic halibut in aquaculture.
(Norway Marine Culture AS, c/o AKVAFORSK, Institute for Aquaculture Research, N-6600 Sunndalsora, Norway)