Effect of light irradiation on dynamics of vitamin A compounds in rotifers and Artemia |
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| Authors: | Yutaka Haga Fuminori Tarui Kengo Ohta Yasuhiro Shima Toshio Takeuchi |
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| Institution: | Department of Marine Biosciences, Faculty of Marine Science, Tokyo University of Marine Science and Technology, Konan, Minato 4-5-7, Tokyo 108-8477,;Hakatajima Station, National Center for Stock Enhancement, Hakata, Ehime 794-2305, and;Notojima Station, National Center for Stock Enhancement, Nanao, Ishikawa 926-0216, Japan |
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| Abstract: | ABSTRACT: The dynamics of vitamin A (VA) compounds in live food during enrichment were examined under different light conditions. Rotifers Brachionus plicatilis and Artemia nauplii ( Artemia ) were enriched with or without 10 mg VA palmitate (VAp) in 1 L of culture medium for 24 h under either bright (2000 lx), or dark (<1 lx) conditions. VAp, retinol (ROH), retinal (RAL) and retinoic acid (RA) contents were analyzed at 0 h (before enrichment) and at 3, 6, 12, 18 and 24 h after the onset of enrichment. Retinoid content in rotifers enriched in darkness was always higher than that enriched under light. VAp content showed two peaks at 3 and 18 h in rotifers enriched in darkness, but it showed one peak at 3 h in rotifers enriched under light. ROH and RA contents increased over the 24-h period in rotifers enriched in darkness, whereas they decreased 12 h onward in rotifers enriched under light. In Artemia , VAp and ROH contents were always higher than when enriched under the bright condition, but their dynamics showed a similar pattern in Artemia enriched under dark and bright conditions. |
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| Keywords: | Artemia enrichment light irradiation rotifer vitamin A |
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