【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10d生长有显著差异(P<0.05),之后20d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)。更多还原

【Abstract】 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).更多还原