Plasma levels of vitamin D-3 metabolites during parr-smolt transformation of Atlantic salmon Salmo salar L.

摘要

Plasma vitamin D and vitamin D metabolites were measured in Atlantic salmon Parr during smoltification and after transfer to seawater. The fish were fed commercial feed for 5 months under natural light, and Na+/K+ ATPase was measured as an indicator of the smoltification status. No significant differences were recorded in the level of plasma vitamin D metabolites. However, a tendency of increasing plasma concentration of 250HD(3) and also a temporary increase in plasma 1,25(OH)(2)D-3 and 24,25(OH)(2)D-3 were recorded prior to seawater transfer. The minor changes in plasma levels of the metabolites indicate a role of the vitamin D metabolites during parr-smolt transformation, although we do not know whether the increased levels are caused by increased synthesis of the metabolites or by decreased binding to receptors or decreased excretion. (C) 2004 Elsevier B.V