Table 2. Summary of dietary nutrient requirement and utilization of rainbow trout, Oncorhychus mykiss (requirement expressed for dry feed except otherwise where mentioned).
Nutrient level Life stage/size class
  Fry Fingerling Juvenile Grower Broodstock
Crude protein, % min 4550 45 43 42 3540
Crude protein, g/kg body weight/day          
Amino acids, % min of dietary feed (dry matter basis)          
  Arginine 2 2 2 2 2
  Histidine 0.7 0.7 0.7 0.7 0.7
  Isoleucine 0.8 0.8 0.8 0.8 0.8
  Leucine 1.4 1.4 1.4 1.4 1.4
  Lysine 1.8 1.8 1.8 1.8 1.8
  Methionine 1 1 1 1 1
  Phenylalanine 1.2 1.2 1.2 1.2 1.2
  Threonine 0.8 0.8 0.8 0.8 0.8
  Tryptophan 0.2 0.2 0.2 0.2 0.2
  Valine 1.3 1.3 1.3 1.3 1.3
Crude lipid, % min          
Essential fatty acids, % min          
  18:2n-6          
  20:4n-6 0.5 0.5 0.5 0.5 0.5
  18:3n-3          
  20:5n-3 1 1 1 1 1
  22:6n-3 0.5 0.5 0.5 0.5 0.5
Carbohydrate, % max  12 12 12 12 12
Crude fibre, % max  3 3 3 3 3
Gross energy, min kJ/g  15.5 15.5 15.5 15.5 15.5
Digestible energy, min kJ/g  15.5 15.5 15.5 15.5 15.5
Metabolizable energy, min kJ/g           
Protein to energy ratio, mg/kJ  25 25 25 22 23
Minerals            
Macroelements (%)           
  Calcium, max 1 1 1 1 1
  Phosphorus, min 0.8 0.7 0.6 0.6 0.6
  Magnesium, min 0.05 0.05 0.05 0.05 0.05
  Sodium, min 0.06 0.06 0.06 0.06 0.06
Microelements, min mg/kg dry diet           
  Potassium 0.7 0.7 0.7 0.7 0.7
  Iron 60 60 60 60 60
  Sulphur          
  Chlorine          
  Copper 3 3 3 3 3
  Manganese 13 13 13 13 13
  Zinc 30 30 30 30 30
  Cobalt          
  Selenium 0.3 0.3 0.3 0.3 0.3
  Iodine 1.1 1.1 1.1 1.1 1.1
  Molybdenium          
  Chromium          
  Flourine          
Vitamins, min IU/kg           
  Vitamin A 2 500 2 500 2 500 2 500 2 500
  Vitamin D 2 400 2 400 2 400 2 000 2 000
Vitamins, min mg/kg           
  Vitamin E 25100 25100 25100 25100 25100
  Vitamin K 1 1 1 1 1
  Thiamine 10 10 10 10 10
  Riboflavin 5 5 5 5 5
  Pyridoxine 6 6 6 6 6
  Pantothenic acid 20 20 20 20 20
  Niacin 10 10 10 10 10
  Folic acid 2 2 2 2 2
  Vitamin B12 0.02 0.02 0.02 0.02 0.02
  Choline 800 800 800 800 800
  Inositol 300 300 300 300 300
  Biotin 0.15 0.15 0.15 0.15 0.15
  Ascorbic acid 40 40 40 40 40
* Requirements measured in fingerling and juvenile fish. Values for other life-history stages are estimates.
Data source: National Research Council (1993)