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We compared the utilization efficiency of free lysine (FL) and dipeptide lysine–glycine (LG) in terms of growth performance and whole-body amino acid composition in olive flounder Paralichthys olivaceus . A basal experimental diet was formulated to con-tain 0.5% (basal) lysine from fish meal, and four other diets were prepared by supplementing 0.5% or 1.0% of either FL or LG. The experiment was performed in triplicate, and 20 randomly selected fish averaging 5.41 ± 0.16 g were fed one of the test diets at the rate of 3% BW/day twice daily for 6 weeks. At the end of the feeding trial, fish fed the basal diet showed significantly less weight gain than did the other groups. The results of a two-way ANOVA showed that both lysine level ( P = 0.001) and type ( P = 0.034) influenced growth rate; however, we found no significant interaction between lysine level and form ( P > 0.05). Our results revealed a significant improvement in protein efficiency ratio (PER) with each increment of dietary lysine, and the groups fed LG-supplemented diets showed higher PER than did those offered FL. Hepatosomatic and viscerosomatic indices were significantly in-fluenced by lysine level and form, and higher values were recorded in fish fed diets containing LG. Significantly higher whole-body arginine levels were found in LG-fed groups, and a significant interaction was observed between lysine level and form (

Comparison of Free and Dipeptide Lysine Utilization in Diets for Juvenile Olive Flounder Paralichthys olivaceus