Weaning trials with cod fry on artificial diets
Original version
This report is not to be cited without prior reference to the authorsAbstract
Three experiments with different size groups of cod fry, 13, 49 and 465 mg wet-weight
were offered 6 different artificial diets. The experiments lasted for 28 days. Growth, and
for the medium size-group chemical composition and gross energy-content of the fish
were measured. Mortality was recorded daily, and the fish were counted after 14 days
and at end of the experiments to correct for cannibalism.
Growth were similar on all diets, probably because of prominent cannibalism. Significant
differences in biomass and survival were found. Survival ranged from 0 to 39 % for the
smallest group and from 72 to 90 % for the largest group. Moist feed gave the best
survival. About 50 % of the mortality was due to cannibalism.