摘要
在水温12~14℃条件下,进行了不同自污染程度对皱纹盘鲍HaliotisdiscushannaiIno幼鲍生长和成活率影响的生产规模试验。结果表明,随着换水频率或水交换量的减小,总氨(TNH+4-N)、活性磷(PO4-P)、亚硝态氮(NO-2-N)和化学耗氧量(CODMn)的含量增加(单位体重鲍所对应的平均污染速率依次为0 176、0 050、0 184、0 294mg/(g·d)),pH下降。自污染对成活率影响较小,对生长影响较大。总氨和pH是自污染水中影响幼鲍生长的主要因子。天然水(pH=8 11±0 06)条件下,总氨对幼鲍相对增长率的EC5(使相对增长率下降5%的总氨浓度)为0 18mg/L(非离子氨为0 004mg/L),EC10(使相对增长率下降10%的总氨浓度)为0 307mg/L(非离子氨为0 007mg/L);总氨在0 75mg/L(非离子氨0 02mg/L)以下时对幼鲍成活率无明显影响。pH的下降对幼鲍的相对增长率有影响,pH的频繁波动对幼鲍相对增重率影响明显。加入Na2CO3适当提高pH,对幼鲍生长有促进作用。作者建议用总氨作为监控鲍养殖闭路循环体系的水质指标,推荐总氨警戒线为0 30mg/L,危险线为0 8mg/L。pH为辅助指标。
Pilot-scale tests were conducted to study effect of self-pollution on growth and survival rate of larvae of Haliotis discus hannai Ino at a temperature of 12~14℃. The results revealed that the contents of NH+4-N, NO-2-N, PO4-P and CODMn increased as a rate of 0.176, 0.050, 0.184, 0.294 mg/(g·d) as water exchange cycle was infrequently or water exchange volume decrease respectively. There were no significant effects of self-pollution on survival rate but on relative growth. Ammonia nitrogen and pH were predominant factors which affects growth of larvae under self-pollution. EC5 of total ammonia was 0.18 mg/L for relative growth of the larvae, with unionized ammonia (UIA) of 0.004 mg/L, EC10 of 0.307 mg/L and UIA of 0.007 mg/L. There were significant effects of decrease and frequent fluctuation in pH value on relative weight gain. However, growth rate was improved by moderate high pH by Na2CO3 addition. It is recommends that total ammonia act as an indicator of recirculation aquaculture system.
出处
《大连水产学院学报》
CSCD
北大核心
2003年第1期1-6,共6页
Journal of Dalian Fisheries University
基金
大连市科委资助项目
辽宁省高校科研资助项目(20102135)
关键词
自污染
皱纹盘鲍
水质
生长
成活率
self-pollution
Haliotis discus hannai Ino
water quality
growth
survival rate