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Response of Rainbow Trout (Oncorhynchus mykiss) Growing from 50 to 170 g to Supplements of Either L-Arginine or L-Threonine in a Semipurified Diet^1,2,3,

Institut für Tierernährung der Universität Bonn, D-53115 Bonn, Germany ^* Degussa AG, Applied Technology Feed Additives, D-63403 Hanau, Germany

We studied the effects of increasing dietary concentrations of either L-arginine or L-threonine on growth, feed intake, feed conversion ratio and composition of gain in rainbow trout. Semipurified diets containing 20.1 MJ digestible energy/kg dry matter, with wheat gluten and crystalline amino acids as sole sources of amino acids, were fed to rainbow trout (initial mean body weight 47 ± 0.7 g). In one series of 12 diets, arginine concentration ranged from 5.0 to 23.8 g/kg dry matter; in a second series of 12 diets, threonine concentration ranged from 3.7 to 21.0 g/kg dry matter. Each diet was fed to a group of 20 fish. During the experiment of 51 feeding days, dry matter intake, weight gain, feed conversion ratio, protein concentration of gain and total protein deposition followed exponential functions. For achieving 95% of the potential maximum protein deposition, dietary concentrations of 11.6 g arginine and 10.4 g threonine/kg dry matter were required. Arginine and threonine were both utilized most efficiently at dietary concentrations of 6 g/kg dry matter. At low dietary concentrations of arginine, deposition of this amino acid exceeded the quantity fed. Recommended dietary concentrations of arginine and threonine will depend on the trait desired in the trout.

KEY WORDS: • requirement • rainbow trout • arginine • threonine

¹ Presented in part at the EIFAC-Workshop on Methodology for Determination of Nutrient Requirements in Fish, June 29–July 1, 1993, Eichenau, Germany [Pack, M., Rodehutscord, M., Jacobs, S. & Pfeffer, E. (1993) Amino acid requirement of rainbow trout (Oncorhynchus mykiss). 2. Protein deposition as function of dietary methionine, threonine and arginine].

² With the financial support of the Deutsche Forschungsgemeinschaft.

³ The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 USC section 1734 solely to indicate this fact.

⁴ To whom correspondence should be addressed.

Manuscript received 30 November 1993. Revision accepted 23 August 1994.