Requirement of Largemouth Bass Juveniles for Dietary Lysine
ZHU Xifeng1, LI Shiyang1,2, HU Junru1, LIANG Haohui1, HUANG Yanhua2, ZHOU Meng2, WANG Guoxia1
1. Collaborative Innovation Center of Aquatic Sciences, Key Laboratory of Animal Nutrition and Feed Science in South China Guangdong, Key Laboratory of Animal Breeding and Nutrition, Institute of Animal Science, Guangdong Academy of Agricultural Sciences, Guangzhou 510640, China; 2. Innovative Institute of Animal Healthy Breeding, College of Animal Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou 510225, China
Abstract：In order to probe the effects of diary lysine level on growth performance, digestion, and antioxidant capacity of juvenile largemouth bass Micropterus salmoides, juvenile largemouth bass with average body weight of approximately 0.07 g were reared in nylon cages with water volume of 75 L at stocking density of 150 individuals per cage disposed in an outdoor aquaculture system, and fed the isonitrogenous and isoenergetic diets containing lysine level of 1.31%, 1.97%, 2.64%, 3.30%, 3.97 and 4.63% for 30 days. The results showed that there was the minimal survival rates in the juvenile largemouth bass in 1.31% lysine groups and 1.97% lysine (P<0.05), with the first increase and then decrease in weight gain rate and specific growth rate in the juvenile largemouth bass fed the diets containing lysine, the maximal level in 2.64% lysine group, as the dietary lysine level increase. The maximal values for trypsin activity, intestinal villus height, muscular thickness, and the number of goblet cells were observed in the juvenile largemouth bass in 2.64% lysine group. The pattern of initial rise and followed by decline in content of malondialdehyde and the activity of peroxidase was found in the in the test fish, with the maximumt in the 3.97% lysine group. According to the specific growth rate as the evaluation index, largemouth bass juveniles had the lysine requirement of 2.65%, accounting for 5.19% of dietary protein, under this test condition based on the broken line model analysis.
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2025, Vol. 44 
