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本文查明了水温极限对两个种群的银大麻哈鱼 Oncorhynchus kisutch 胚眙及仔鱼发育率的影响,以及孵化温度的上限和下限。在稳定的孵化温度下,胚胎能经受1.3～12.4℃的温度范围,在14℃以上或1.3℃以下几乎100%死亡。最大的死亡率发生在胚胎发育早朝,尤其是在胚孔封闭前。除了在最高孵化温度(10.2℃)下,一时性的温度突然变化时间持续8小时,变幅从增加8.4℃到减少6.2℃(包括下降到0.1℃)其胚胎死亡率很少增加甚至不增加。温度对发育时间的影响不是呈直线相关的,有时温度微小的交动会导致发育率明显的变化,尤其在孵化温度的上限和下限时。文中列出的一组公式表明温度与达到50%孵化率和完成100%卵黄吸收所需积温的相关关系;另一组公式则表明温度与达到50%孵化率和100%卵黄吸收的天数之间的相关关系。
This paper identified the effects of water temperature limits on the developmental stages of larval and larvae of Oncorhynchus kisutch and the upper and lower incubation temperatures for two populations. At stable hatching temperatures, embryos can withstand temperatures in the range of 1.3-12.4 ° C, with almost 100% death above 14 ° C or below 1.3 ° C. The greatest mortality occurs in the early embryonic development, especially before the embryo is closed. Except at the highest incubation temperature (10.2 ° C), the sudden temperature changes for a duration of 8 hours, with little or no increase in embryo mortality from 8.4 ° C to 6.2 ° C (including down to 0.1 ° C). The effects of temperature on developmental time are not linearly correlated, and sometimes slight changes in temperature result in significant changes in developmental rates, especially at the upper and lower incubation temperatures. The set of equations presented here shows the correlation between temperature and 50% hatchability and the accumulated temperature required to achieve 100% egg yolk absorption. Another set of equations indicates the correlation between temperature and the number of days at which 50% hatching and 100% yolk absorption are achieved The relationship between.