Metabolism of Carotenoids in Cultured Sea Cucumber, Stichopus japonicus Fed Frozen Sea Weed.

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  • 冷凍ワカメを餌料とした養成マナマコのカロテノイド代謝

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Abstract

This study investigated the carotenoid profiles in the gonads of wild sea cucumber Stichopus japonicas from both red and green types and in cultured individuals of the green type, with the following results:<BR>1. The carotenoid profiles of the gonads of the red and green types were quite similar to each other. The major carotenoids were canthaxanthin (30-60%) and (3S, 3'S) -astaxanthin (12-20%), whereas β-carotene, β-echinenone, 4'-hydroxy-β-echinenone, canthaxanthin, phoenicoxanthin, zeaxanthin, 4-ketozeaxanthin, 7, 8-didehydroastaxanthin, 7, 8, 7', 8'-tetradehydroastaxanthin, astaxanthin, alloxanthin, and pectenolone were found in varied amounts.<BR>2. The net carotenoid content of the gonads increased with enlargement of the gonadal index. With increasing gonadal index, the percentage compositions of β-carotene, β-echinenone, and canthaxanthin decreased, while those of phoenicoxanthin and astaxanthin increased.<BR>3. Expermental feeding of sea cucumber (green type from Oomura bay, Kyushu) with sea weed (containing β-carotene) showed an increase in the contents of β-carotene, β-echinenone, 4'-hydroxy-β-echinenone, canthaxanthin of the gonads in comparison to unfed controls.<BR>4. Taking into consideration the experimental results of (2) and (3) described above, the following possible oxidative metabolic pathway of β-carotene has been postulated: β-corotene→ β-echinenone →4'-hydroxy-β-echinenone→canthaxanthin→phoenicoxanthin→astaxanthin.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (2), 229-235, 1995

    Japanese Society for Aquaculture Science

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