Effects of Incubation Temperature on Egg Development, Hatching and Pigment Plug Evacuation in Farmed Siberian Sturgeon Acipenser baerii
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참고문헌
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초록
Early ontogenic development in Siberian sturgeon Acipenser baerii was documented and the effects of different temperatures on embryonic and prelarval development were examined. Photograph-assisted data on morphogenesis in Siberian sturgeon prolarvae agreed well with published descriptions of their ontogeny and ecological behaviors, although certain aspects of differentiation, such as gill covering and scute development, could be rearing condition-sensitive. The present study provides the first characterization of the transient development of teeth during early larval stages; the pattern was congruent with the transition of prolarvae to exogenous feeding. From examinations of embryonic and prelarval development under different temperature conditions (12–24°C),developmental speed was inversely related with temperature. Overall, hatchability was higher and hatching events were more synchronized at 20°C than at lower temperatures. After hatching, similar patterns of temperature-dependency were observed in yolk sac absorption and the evacuation of the pigment plug. Our results suggest that the incubation of Siberian sturgeon embryos and prolarvae at temperatures close to 20°C would be advantageous in hatcheries, based on reductions in the duration and uniformity of egg and prolarval developmental stages.
Abstract
Early ontogenic development in Siberian sturgeon Acipenser baerii was documented and the effects of different temperatures on embryonic and prelarval development were examined. Photograph-assisted data on morphogenesis in Siberian sturgeon prolarvae agreed well with published descriptions of their ontogeny and ecological behaviors, although certain aspects of differentiation, such as gill covering and scute development, could be rearing condition-sensitive. The present study provides the first characterization of the transient development of teeth during early larval stages; the pattern was congruent with the transition of prolarvae to exogenous feeding. From examinations of embryonic and prelarval development under different temperature conditions (12–24°C),developmental speed was inversely related with temperature. Overall, hatchability was higher and hatching events were more synchronized at 20°C than at lower temperatures. After hatching, similar patterns of temperature-dependency were observed in yolk sac absorption and the evacuation of the pigment plug. Our results suggest that the incubation of Siberian sturgeon embryos and prolarvae at temperatures close to 20°C would be advantageous in hatcheries, based on reductions in the duration and uniformity of egg and prolarval developmental stages.
참고문헌 (26)
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