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Walton MJ, Cowey CB, Coloso RM, et al. Dietary requirements of rainbow trout for tryptophan, lysine and arginine determined by growth and biochemical measurements. Fish Physiol Biochem. 1986;2(1):161-9doi: 10.1007/BF02264084.
Walton, M. J., Cowey, C. B., Coloso, R. M., & Adron, J. W. (1986). Dietary requirements of rainbow trout for tryptophan, lysine and arginine determined by growth and biochemical measurements. Fish physiology and biochemistry, 2(1), 161-9. https://doi.org/10.1007/BF02264084
Walton, M J, et al. "Dietary requirements of rainbow trout for tryptophan, lysine and arginine determined by growth and biochemical measurements." Fish physiology and biochemistry vol. 2,1 (1986): 161-9. doi: https://doi.org/10.1007/BF02264084
Walton MJ, Cowey CB, Coloso RM, Adron JW. Dietary requirements of rainbow trout for tryptophan, lysine and arginine determined by growth and biochemical measurements. Fish Physiol Biochem. 1986 Oct;2(1):161-9. doi: 10.1007/BF02264084. PMID: 24233178.
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Fish Physiol Biochem. 1986 Oct;2(1):161-9. doi: 10.1007/BF02264084.

Dietary requirements of rainbow trout for tryptophan, lysine and arginine determined by growth and biochemical measurements.

Fish physiology and biochemistry

M J Walton, C B Cowey, R M Coloso, J W Adron

Affiliations

  1. NERC, Institute of Marine Biochemistry, St. Fittick's Road, AB1 3RA, Aberdeen, Scotland.

PMID: 24233178 DOI: 10.1007/BF02264084

Abstract

Three separate studies were performed to determine the dietary requirements of rainbow troutSalmo gairdneri for tryptophan (Trp), lysine (Lys) and arginine (Arg) from both growth and biochemical data. The growth studies were carried out over a 12 week period. From graphical plots of % mean weight gain against % amino acid in diet the following requirement values were obtained, Trp 0.25% diet (0.4% dietary crude protein); Lys 1.9% diet (4.3% dietary protein); and Arg 1.6-1.8% diet (3.6-4% dietary protein). Plasma and liver amino acid concentrations measured 20h after feeding did not prove useful for determination of requirement values. Hepatic activities of Trp pyrrolase (TP), Lys α ketoglutarate reductase (LKGR) and arginase were not significantly affected by varying levels of Trp, Lys and Arg respectively in the diet. TP has a cytosolic location and a Km of 0.2 mM for Trp; LKGR is mitochondrial and the Km for Lys is 7.3 mM; arginase is also mitochondrial and has a Km of 4.9 mM for arginine. Measurements of expired(14)CO2, after injection of a tracer dose of(14)C amino acid, did allow estimates of requirement levels to be made. The values obtained from the oxidation studies reinforced the values obtained from the growth data but were not precise enough to justify using this method on its own.

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