Abstract
Six groups of Atlantic salmon ( Salmo salar) fry were startfed with frozen Daphnia longispina, standard Ewos startfood or unfiltered live zooplankton drained from the littoral zone of a coastal lake. Through the last 5 days of the experiment, those fed live zooplankton were given additional food in the form of frozen Daphnia. Dry-fed groups were the only ones to have an overall weight gain but they had the lowest activity. Fry fed live zooplankton had the highest activity but the natural species composition of this food was not optimal for startfeeding. Survival was highest in the group fed frozen Daphnia and kept in a tank with bottom drainage. High yolk absorption rates, implying early termination of the yolk-sac phase, as found in groups fed live zooplankton, may be favourable if a net energy gain can be achieved by early feeding on a live prey.
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