Effects of Growth and Feeding Habit on the Carotenoid Pattern of Young Striped Mullet.

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  • ボラ初期若魚のカロテノイドパターンにおよぼす成長，食性についての考察

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Abstract

In this paper, the effects of growth and feeding habit on the carotenoid pattern of wild and tank-reared young striped mullet were investigated. The results of cultured striped mullet were also analysed in relation to the persence of attaching algae in the culture tank.<BR>The carotenoid pattern in early young fish varied depending on the date and location of capture, but correlated storongly with their developmental stage and feeding habits. The principal carotenoid of the carnivorous early young striped mullet (locally known as “haku”) was tunaxanthin, a reductive metabolic product of astaxanthin from their main food, copepods. On the other hand, that of the herbivorous late young striped mullet (locally known as “oboko”) was diatoxanthin from their food, diatoms. Thus, this shift from tunaxanthin to diatoxanthin well corresponds with metamorphosis from the carnivorous “haku” to the herbivorous “oboko”. The total amount of carotenoids of young striped mullets reared in uncovered sea water tank (with adhesive algae) amounted to two-three times that of fish reard in covered tanks (without adhesive algae) and the amount of diatoxanthin was 10 times higher in the former. In conclusion, the total amount and percentage composition of carotenoids in young striped mullets are remarkably influenced by the presence of adhesive algae in culture tank.

Journal

  • Aquaculture Science

    Aquaculture Science 43 (2), 199-203, 1995

    Japanese Society for Aquaculture Science

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