THE EFFECT OF FISH MEAL CONTAINING DIFFERENT LEVELS OF FISH SOLUBLES ON THE GROWTH OF RAINBOW TROUT (Salmo gairdneri)

Abstract

AbstractTwo experiments were conducted to examine the effect of fish soluble additives in fish meal used as a protein source in dry diets to rainbow trout. Experiment I was made up by 3 dietary groups, run with 4 replicates of 100 trout on each diet. The protein sources examined were as follows: (1) presscakemeal, (2) whole meal, and (3) whole meal + lysine to the same levels as (1). The experiment was run for 12 weeks with ad libitum feeding three times a day. The results showed significantly lower (P < 0.05) weight gain for trout given presscakemeal as compared with whole meal. Experiment II evaluated 3 diets, run in triplicates with 100 trout in each aquarium. Presscakemeal (1), whole meal (2), and whole meal + extra addition of fish solubles (3) were examined as protein sources. The experiment was conducted for 16 weeks. The average weight gains were not significantly different among the dietary groups. The conclusion drawn from the experiments is that fish meal with fish soluble additives is preferred as a protein source in feed for rainbow trout.