Embryonic Development and Effects of Water Temperature on Hatching of the Bluefin Tuna, Thunnus thynnus.

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  • クロマグロ卵の発生とふ化に及ぼす水温の影響
  • クロマグロ卵の発生と孵化に及ぼす水温の影響
  • クロマグロラン ノ ハッセイ ト フカ ニ オヨボス スイオン ノ エイキョウ

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Ontogenetic development of bluefin tuna, Thunnus thynnus, eggs and the effect of water temperature on their developmental speed, time required from spawning to hatching, and hatching rate were studied. The eggs floating freely and spherical in shape with a diameter of 0.97±0.25mm (average±SD, n=60) did not change during development. Their development patterns appeared to be typical of common teleost fishes. Incubation at 24°C initiated hatching from 32h after fertilization. Time required from spawning to hatching decreased exponentially with increasing of temperature. A flection point at about 25°C was found when the logarithm of time required from spawning to hatching was plotted against the incubation temperature. Incubations at temperature between 19.9 and 31.5°C could produce normally hatched larvae at certain rates; more than 50% of the total eggs hatched normally within the range of 21.2-29.8°C. At 25°C, the rate of deformed larvae among those hatched was the lowest. We thus concluded that 25°C would be the most appropriate water temperature for bluefin tuna embryonic development.

Journal

  • Aquaculture Science

    Aquaculture Science 48 (2), 199-207, 2000

    Japanese Society for Aquaculture Science

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