Effect of temperature and salinity on the egg incubation period of the Carybdis feriatus
Effect of temperature and salinity on the egg incubation period of the Carybdis feriatus
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发表时间：
2008
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通讯作者：
Chen Quanzhen
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作者：
Chen Quanzhen
本文在实验室条件下研究了温度和盐度对红蟹（Charybdis feriatus）孵化期的影响。雌卵在100 L玻璃罐中饲养，温度分别为14、21、23、25、27、29和36℃，盐度分别为15、20、25、30、35。结果表明，在21 ~ 29℃范围内，随着温度的升高，潜伏期从28 ~ 10 d呈指数递减。采用幂函数模型（D = aTb）分析温度(T)与卵孵化期(D)的关系；方程D= a(T-a)b；有效积温D= a/(T-a)。热总和理论方程是表征温度与孵育天数关系的最佳模型。有效积温为15.68℃，发育的生物零度。最佳孵育温度为27 ~ 29℃，最佳孵育盐度为20 ~ 35℃。在低盐度环境下，胚胎一定发育得更慢，但后来卵子含水量的增加可能加速了孵化过程。最佳孵育盐度为30 ~ 35。结果表明，盐度(S)与卵孵化期(D)的最佳关系模型为D=0.53+200.24-0.14 S+0.24 S（R2=0.99,P0.01）。
This paper studied the effects of temperature and salinity on incubation period of the red crab(Charybdis feriatus) in the laboratory.Ovigerous females were reared in 100 L glass tanks at seven temperatures(14,21,23,25,27,29,and 36 ℃) and five salinities(15,20,25,30,35) levels.resulte showed that the incubation period decreased exponentially from 28 to 10 days with increasing temperature in the range 21-29 ℃.Relationship between temperature(T) and egg incubation period(D) was analyzed using the following three equation models: power function,D= aTb;Bělehradek's equation,D= a(T-a)b;and from the Effective Accumulated Temperature,D= a/(T-a).the equation of heat summation theory was the best model to characterize the relationship between temperature and the number of days required for incubation.The biological zero temperature for development was 15.68℃ for the Effective Accumulated Temperature.The optimal incubation temperature was 27-29 ℃ while the optimal incubation salinity was 20-35.At low salinities,embryos must have developed more slowly,but later the enhanced water content of the eggs might have accelerated the hatching process.The optimal incubation salinity was 30-35.As the results express as curve regression,the best model of relationship between salinity(S) and egg incubation period(D) was D=0.53+200.24-0.14 S+0.24 S(R2=0.99,P0.01).