Artificial hatching substrate, effect on RNA / DNA ratio and protein retention during the yolk-sac period of Atlantic salmon (Salmo salar)

摘要

Genetical groups of Atlantic salmon (Salmo salar) werehatched in a Caiifonian hatching system with and without anastro-turf artificial hatching substrate, and were latertransfered to separate feeding units.The substrate reared (ATR) alevins grew faster, absorbed theyolk faster and more efficient, and absorbed protein from the yolk faster and more efficient, than flat screen reared (FSR) alevins. Protein synthesis, RNA content, DNA content, and theRNA-DNA ratio were higher in favour of the substrate rearedalevins. The differeces in disfavour of the FSR alevins areprobably due to high activity stress.After commencement of first feeding the ATR fry grewfaster, and RNA content and DNA content were higher than in theFSR fry. However a difference in specific growth rate in favourof the FSR fry was observed at the end of the experiment. TheRNA-DNA ratio was in favour of the ATR fry immediatly aftercommencement of first feeding, but in favour of the FSR fry atthe end of the experiment.