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The influence of salinity on the morphological development of yolk sac larvae of Atlantic halibut Hippoglossus hippoglossus (L.)
- Bolla, S., Ottesen, O.H.
- Aquaculture research 1998 v.29 no.3 pp. 203-209
- halibut, yolk sac, larvae, anatomy and morphology, biological development, salinity, mortality, heat sums, fish culture
- 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 per thousand and 32.3 per thousand. Yolk sac larvae incubated at 35.5 per thousand developed early tail deformities before 50 day-degrees (9 days post-hatch), and necrosis, oedema and calculus in the urinary bladder at about 150 day-degrees (28 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 per thousand compared to 7% at 32.3 per thousand. 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.