摘要
取体长分别为 3和 5cm的栉孔扇贝 (Chlamysfarreri)置室内水泥池流水暂养 1周后 ,进行盐度和pH变化对其存活、呼吸、摄食及消化影响的实验。结果表明 ,栉孔扇贝 96h的半致死盐度为 2 5。在不同盐度的海水中暴露 2 4h的实验结果为 ,栉孔扇贝随盐度的降低 ,出现耗氧率升高 ,随后逐渐下降 ,到盐度 15时不再耗氧而死亡 ;滤水率和淀粉酶活性随盐度降低而降低 ,盐度为 15时完全不滤水 ,淀粉酶完全失去活性。小个体栉孔扇贝耐低盐能力较大个体的略大些。pH降至 7.8以下时开始对栉孔扇贝的存活产生影响 ,降至7.6时 ,4 8h后死亡率为 35%左右 ;7.2时达 50 % ;降至 7.0时扇贝不能存活。
Two sizes of scallop (Chlamys farrei), body length 3 cm and 5 cm,were caltured in flowing water indoor for a week(water temperature 25℃±1℃),then began the experiment. The results showed that the 96 h LT 50 of salinity was 25. The 24h exposure test indicated that as the salinity decreased, the oxygen demand rate raised initially, and then, fell; at salinity less than 15, the scallops had no oxygen demand and died. With the decrease of salinity, the water filtrating rate and amylase activity decreased; also at salinity less than 15, the scallop did not filter water and the amylase activity vanished. The tolerance limit of large scallop was higher than that of small scallop to low salinity. Otherwise, pH influenced survival of scallop as its level below 7.8 that the mortatlity was about 35% at pH 7.6, and about 50% at 7.2 48 h later.At pH 7.0,all the scallops died. The tolerance limit of large scallop was higher than that of small scallop at low pH. The conclusions are that flood, industrial wastewater and rainstorm, especially acid rain, can cause a sudden decrease in salinity and pH in local culture area, and furthermore, lead to the death of scallop.
出处
《中国水产科学》
CSCD
2000年第4期73-77,共5页
Journal of Fishery Sciences of China
基金
农业部重点科研资助项目(渔85-95-11-01)
国家"九五"攻关专题资助项目(96-922-02-01)
山东省自然科学基金资助项目(Q99D13).
关键词
栉孔扇贝
盐度
PH
死亡率
耗氧率
滤水率
淀粉酶活性
Chlamys farreri
salinity
pH
mortality
oxygen demand rate
water filtrating rate
amylase activity