What is it about?

Research with channel catfish has shown lysine supplementation improves protein quality of low-lysine protein sources such as cottonseed meal and peanut meal. In formulating commercial catfish feeds, synthetic lysine (L-lysine HCl) has been generally assumed to be 100% available to the fish. However, there have been reports that synthetic lysine may be less available to channel catfish than protein-bound lysine. In this study we evaluated efficacy of crystaline lysine in diets for pond-raised hybrid catfish.

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Why is it important?

Lysine is generally considered to be the first limiting amino acid for most cultured fish. Because of dramatic increases in prices of soybean meal and corn in recent years, more alternative ingredients, such as cottonseed meal and corn by-products, corn gluten feed, corn germ meal, or distillers dried grains with solubles are being used in commercial catfish feeds to reduce feed cost. These alternative ingredients are low in lysine, and therefore supplemental lysine is increasingly used to ensure diets contain adequate lysine to meet the requirement. Knowing the efficacy of synthetic lysine is important in formulating cost-effective feeds for catfish. Results from this study show that crystalline lysine can be considered 100% available when used to supplement lysine-deficient diets for pond-raised hybrid catfish.

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This page is a summary of: Efficacy of Crystalline Lysine in Alternative Diets for Pond-raised Hybrid Catfish, ♀Ictalurus punctatus× ♂Ictalurus furcatus, Journal of the World Aquaculture Society, April 2016, Wiley,
DOI: 10.1111/jwas.12285.
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