Comparative nutrition papers
Vitamin D studies with channel catfish (Ictalurus punctatus) reared in calcium-free water

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Abstract

  • 1.

    1. Various levels and forms of vitamin D were fed to channel catfish (Ictalurus punctatus) in rearing water containing 0.0 mg/1 calcium; an experimental system in which fish must rely on a dietary source of calcium.

  • 2.

    2. Based on weight gain data, the dietary requirement for vitamin D from these studies appeared to be 250–500 I.U./kg as either cholecalciferol or ergocalciferol.

  • 3.

    3. Plasma K, 25-OHD, and 24,25-(OH)2D levels indicated a dietary requirement of 20001.U./kg as cholecalciferol.

  • 4.

    4. The discrimination in use of relatively high levels of ergocalciferol appeared to be related to further hydroxylation of the 25-hydroxymetabolite.

  • 5.

    5. Effects on calcium and phosphorus levels were not affected by levels or form of the vitamin and emphasize the differences between aquatic and terrestrial vertebrates.

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  • Cited by (0)

    Present address: Mississippi State University, Delta Branch Experiment Station, Stoneville, MS 38776, U.S.A.

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