Ontogenetic Change in Oxygen Consumption of Bluefin Tuna, Thunnus thynnus.

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  • 人工孵化クロマグロの発育に伴う酸素消費量の変動

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Abstract

To obtain basic information on artificial seed production for aquaculture of bluefin tuna, Thunnus thynnus, the ontogenetic change in oxygen consumption of artificially hatched bluefin tuna was investigated from egg to 132 days after hatching. Individual oxygen consumption (M, μl/min) of eggs was almost constant from morla to the appearance of Kupper's vesicle stage. Then, M rapidly increased from the heart beating stage (HB), at just before hatching it was about 8 times the volume before HB. After hatching, ontogenetic change of M showed a four-phasic allometry in relation to body mass (g) . Flection points were at the transitional period from endogenous to exogenous feeding, postflexion stage, and juvenile stage. During the endogenous feeding stage, M was almost constant. From the exogenous feeding to juvenile stage, M rapidly increased with the development of body weight. From the juvenile to young stage, the increase of M slowed down. It was shown that oxygen consumption of bluefin tuna rapidly increases at an early stage.

Journal

  • Aquaculture Science

    Aquaculture Science 47 (2), 269-275, 1999

    Japanese Society for Aquaculture Science

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