Threonine, Histidine and Lysine Requirements of Chum Salmon Fry

Abstract

Three 4-week feeding studies were conducted to determine quantitative requirements of chum salmon fry for threonine, histidine and lysine. The basal diet containing crystalline L-amino acids and 5 % casein as nitrogen sources (40 % crude protein) were isonitrogenously supplemented with graded level of threonine, histidine and lysine by adjusting the level of alanine. Based on growth data, the requirements for threonine, histidine and lysine were found out to be 1.2, 0.7 and 1.9 percent of diet (dry weight basis), or 3.0, 1.6 and 4.8 percent of dietary protein, respectively. © 1985, The Japanese Society of Fisheries Science. All rights reserved.