方斑东风螺对盐度适应性的研究

Study on adaptability of Babylonia areolata to salinity

通过实验生态学的方法，在温度28．2～29．7℃、pH7．6—8．3的条件下，研究了养殖方斑东风螺（Babylonia areolata）的适宜、最适生存盐度及适宜、最适生长盐度，以期为养殖生产提供科学依据。生存临界盐度界定为120h50％死亡的盐度（120hLS50），其范围为适宜生存盐度；生长临界盐度界定为增长率为最佳一组30％所对应的盐度，其范围为适宜生长盐度；把经过多重比较结果显示无显著差异的存活率或13生长量最高的几个实验组所对应的盐度范围作为最适生存或生长盐度。研究结果表明，方斑东风螺适宜生存盐度为19．18～41．39，最适生存盐度为26．0—34．4；适宜生长盐度为19．28～39．96，最适生长盐度为26．0—31．6。当盐度变化超出最适范围时，养殖方斑东风螺对低盐更为敏感。

Under the water temperature and pH ranges of 28. 2 -29.7 ℃ and 7.6 -8. 3, respectively, study on the suitable and optimal salinities respectively for survival and growth of Babylonia areolata was investigated using experimental ecological methods, aiming at providing scientific evidence for its aquaculture. The salinity at which juvenile mortality of 50% in 120 hours occurred in experiment was defined as the critical survival salinity, and the salinities in between the highest and lowest were regarded as the suitable survival salinities. The salinity responsible for 30% of the highest growth rate was defined as the critical growth-suitable salinity, and salinities in between the highest and lowest were regarded as the growth suitable salinity. Salinities at which the highest survival or growth rates among groups were not significantly different by multiple comparison were set to be the optimal survival or growth salinities. Results showed that the suitable survival salinity for B. areolata juveniles was 19. 18 ～ 41.39, the optimal survival salinity was 26.0～34.4. The growth suitable salinity was 19. 28 ～ 39. 96, the growth optimal salinity was 26. 0 ～ 31.6. When salinity was beyond the optimum, the juveniles were more sensitive to low salinity.