Evaluation of High-Level Inclusion of Recycled Food Wastes Supplemented with Lysine, Methionine and Arginine in the Diet of Nile Tilapia Oreochromis niloticus Juveniles

Abstract

This study evaluates the use of high-level inclusion of recycled food waste materials: food industrial waste (FIW) and soy sauce waste (SSW) supplemented with lysine methionine and arginine (AA) to replace fishmeal (FM) in practical diets of Nile tilapia Oreochromis niloticus juveniles. Fish (mean initial weight 6.1±0.1 g) were fed five diets containing different levels of recycled waste materials (designated as FM, FIW+AA (dietary level: 70.5%), FIW+SSW+AA (65.0%), SSW+AA (56.5%) and FIW+SSW (60.0%) for 84 days. Growth, feed utilization and survival rate in fish fed the FIW+AA and SSW+AA diet were significantly lower than that in FM (P<0.05) whereas; no significant difference was obtained in these parameters between fish fed the FM and FIW+SSW+AA (P>0.05). Protein digestibility in fish fed the FM diet was significantly the highest (P<0.05), whereas it was lowest in FIW+AA. Whole body proximate composition of fish fed all diets showed that the level of recycled waste materials added influenced moisture and lipid contents. The result of this study indicates that a combination of FIW and SSW, supplemented with AA gives better growth performance when used to completely replace FM in the diet for juveniles tilapia.