Nutritive potential and utilization of super worm (Zophobas morio) meal in the diet of Nile tilapia (Oreochromis niloticus) juvenile
Super worm meal (SWM) was evaluated to investigate the effect of partial or total replacement of fish meal (FM) in diets for tilapia juvenile, Oreochromis niloticus. Triplicate groups of fish with average initial body weight (5.57 ± 0.15 g) were fed each with 5 isonitrogeneous (32% crude protein) diets formulated to include 0, 25, 50, 75 and 100% (diets 1 – 5, respectively) of FM substituted with SWM. After eight weeks of feeding trials, fish fed with diet 2 and 3 revealed the highest values for live weight gain, specific growth rates, better feed conversion ratio as well as protein efficiency ratio compared to the others. Survival range was 100% in all the treatments. However, fish fed to diet 5 exhibited lower growth than those fed others diets. There were no significant differences (P > 0.05) in the moisture, protein, lipid and ash content in the whole body composition. These results clearly indicate that up to 25% of FM protein in fish diet can be replaced by SWM without any adverse effect on feed utilization and body composition. A decrease in weight gain and other growth associated parameters was observed with higher replacement.
Key words: Feed utilization, growth performance, insect based diet, Oreochromis niloticus, super worm meal, Zophobas morio.