Effects of suplementing DL-alanine and betaine as an attractant substance on growth and carcass composition of fingerling rainbow trout (oncorhynchus mykiss, W. 1972) diet

ABSTRACT MSc THESIS Effects of Suplementing DL-Alanine and Betaine as an Attractant Substance on Growth and Carcass Composition of Fingerling Rainbow Trout (Oncorhynchus mykiss, W.1972) Diet Gülsün BEKLEVIK DEPARTMENT OF FISHERIES INSTUTE OF NATURAL AND APPLIED SCIENCES UNIVERSITY OF ÇUKUROVA Supervisor: Assoc. Prof. Dr. Abdurrahman POLAT Year 1999, Pages 40 Jury: Assoc. Prof. Dr. Abdurrahman POLAT Assoc. Prof. Dr. Metin KUMLU Asst.Prof. Dr. Mehmet ÇELİK In this study, effects of feeds suplemented with DL-alanine and betaine as attractants on growth and carcass composition of the fingerling rainbow trout (Oncorhynchus mykiss), commonly cultured in our country and world, have been investigated. As a result of this experiment, fish fed on DL-alanine (1.5 % of diet) and betaine (1.5 % of diet) supplemented diets gave the highest weight gain (35.36±1.81g and 38.47+3.02 g respectively) than those fed on control diet (28.32+0.31 g). It is found that the groups fed with attractant suplemented diets had better feed conversion rate and protein efficiency rate than control group. Total body dry matter, carcass and total body crude ash and protein ratio were smilar in all the groups (p>0.05). The group fed on DL-alanine supplemented diet had a higher carcass dry matter ratio than the control group (p<0.05) and all the groups had similar carcass lipit ratios (p>0.05). Key Words: Rainbow trout, DL-alanine, Betaine, Attractants n