低盐胁迫对刺参存活、摄食和生长的影响

Effects of low salinity stress on survival, growth and feeding rate of sea cucumber Apostichopus japonicus

中文关键词: 刺参  低盐胁迫  摄食率  食物转化率  生长

英文关键词: Apostichopus japonicus  Low salinity stress  FR  FCR  Growth

中文摘要:

      采用实验生态学的方法设置包括自然海水在内的4个盐度组,分别为31（自然海水，对照组A）、26（B组）、22（C组）、18（D组）。按逐步降盐（DG）与盐度突变（DS）两种盐度变化模式对各组刺参进行盐度胁迫实验。结果表明，B组仅个别较小个体出现死亡现象，C组和D组刺参个体的DG与DS实验组的成活率均出现显著差异(P < 0.05)，DS-D组的成活率最低,仅为45.67%。不同盐度胁迫的各实验组之间，摄食率与食物转化率存在显著差异(P < 0.05)；而各实验组内，DG处理和DS处理的刺参个体的FR和FCR差异均未见显著(P>0.05)。B组内的两种降盐方式在降盐后的前10 d生长有显著差异(P < 0.05)，之后20 d内差异不显著(P>0.05)。C组和D组的刺参个体在实验中均出现体重负增长，与其余各组的SGR差异显著(P<0.05)。

英文摘要:

      Survival, growth and feeding rate of sea cucumber Apostichopus japonicus were studied in two different salinity change modes (DG: salinity Decreased Gradually; DS: salinity Decreased Sharply). In each mode, sea cucumbers were kept in seawater at 4 different salinities (31-A, 26-B, 22-C, 18-D) for 30d. The results showed that there were only a few individuals died in group B. There was significant difference between group C and D in DG and DS modes (P<0.05). The lowest survival rate was in group DS-D as 45.67%. There was significantly different FR and FCR between treatments under different low salinity stress (P<0.05). However, no significantly different FR and FCR appeared between different salinity change modes (DG and DS) during the experimental period (P>0.05). In group B, there was significant difference on growth of sea cucumber between two salinity change modes in the first 10d after the salinity decreased (P<0.05), but no significant difference in the next 20d (P>0.05). During the experiment, there were negative growth in group C and D, being significantly different from the other groups (P<0.05).