Amino acid Protein to fat ratio Amino acid need of fish %
(Tscherbina and Gamygin 2006)
52/12 45/22
Indispensable
Lysine 4.49 4.2 4.1
Methionine 1.45 1.49 1.0
Tryptophane 0.75 0.68 -
Arginine 4.71 4.38 3.1
Histidine 1.89 1.76 0.7
Leucine 4.83 4.4 4.8
Isoleucine 3.9 2.6 3.5
Phenylalanine 3.2 2.9 2.6
Threonine 2.92 2.5 2.9
Valine 3.74 3.4 3.3
Replaceable
Cystine * 1.03 0.75 0.9
Glycocoll 2.9 2.4 2.1
Tyrosine * 1.4 1.2 1.1
* - conditionally replaceable
Table 3: Amino acid content of experimental variants of diets for pre-spawning maintenance of sturgeon breeders for the purpose of improving the quality of fertilized hard and food roe