Running Title: Amino acid supplementation in the tilapia diets. Key words: ...... or copy and paste from your manuscript into the template. Should you .... 3 Borders can be prepared using the 'Draw Borders' option, found on the 'Design' menu.
The Israeli Journal of Aquaculture - Bamidgeh, IJA:65.2013.885, 8 pages
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Replacement of Fish Meal by Poultry By-product Meal with Lysine, Methionine and Threonine Supplementation to Practical Diets for Nile Tilapia Fry (Oreochromis niloticus) Baki Aydin and Erkan Gümüş* Akdeniz University, Faculty of Fisheries, Antalya 07058, Turkey Running Title: Amino acid supplementation in the tilapia diets Key words: Tilapia, poultry by-product meal, fishmeal replacement, growth, digestibility. Abstract In this study, the possibility of replacing commercial fishmeal by poultry by-product meal (PBM) with lysine (Lys), methionine (Met) and threonine (Thr) supplementation to practical diets for Nile tilapia fry, Oreochromis niloticus (initial wt 0.879±0.09 g) was investigated. Triplicate groups of 20 fish were fed to apparent satiation three times daily each of five isonitrogenous (34% crude protein), isolipidic (9% crude lipid) and isoenergetic (3570 DE kcal/kg) diets with 0% (control), 25%, 50%, 75% and 100% of the fish meal protein replaced by PBM protein for 12 weeks in 65 l glass aquariums. Lys, Met and Thr were supplemented diets PBM25 (without Lys), PBM50, PBM75 and PBM100 in order to match the amino acid profiles of the control diets. Results demonstrated that fish growth increased with increasing PBM up to 50%, which was produced the highest growth of the treatments. At the replacement levels of 75% and 100%, however, there was a severe decrease in growth performance, protein efficiency ratio and poor feed conversion ratio. Whole body composition, survival rate, CF, HIS and VSI among all groups at the end of the experiment were not significantly affected by the dietary treatments (P>0.05). Protein, lipid and energy digestibility coefficients of the diets decreased with increasing dietary PBM, were significant differences among dietary treatments (P
