The transfer of Atlantic salmon (Salmo salar) with constricted yolk sacs to an artificial hatching substrate

Abstract

Atlantic salmon larvae were transferred from a flat screened hatching tray to an artificial hatching substrate when all larvae had developed yolk sac constrictions. The transfer increased the growth rate and the yolk absorbtion rate of the larvae. When the larvae was transferred at an early stage the yolk constrictions was absorbed normally showing that yolk sac constrictions are not an irreversible injure but rather a condition which is maintained through high larval activity.