Influences of some environmental factors on growth and survival of Babylonia areolata juveniles

Under the conditions of controlled seawater temperature,salinity,pH and substrate,the influences of temperature,salinity,pH and substrate on the growth and survival of Babylonia areolata juveniles were studied respectively.The results showed that:the upper and lower limited temperature were 11℃ and 35℃ respectively.The optimum temperature was 14~32℃ and the most optimum temperature was 26~29℃.under the optimum temperature,the growth rate increased with increasing temperature: the growth rate was 226.5μm/d at 29℃.The upper and lower limited salinity were 11 and 38 respectively.The optimum salinity was 14~35 and the most optimum salinity was 17~29.Under the optimum salinity,the low salinity can improve the growth rate of B.areolata juveniles.The influences of salinity on growth was less obvious than that of the temperature.The growth was the best and the survival rate was the highest at sea water pH value of 8.When the pH value lower than 7 and higher than 9,the growth and the survival rate will be obviously declined.Some sand which put on the bottom of the pool will increase the growth rate remarkable but has no remarkable influences on the survival rate of B.areolata juveniles.