降低活鱼水体氨氮的技术

Technology of reducing ammonia-nitrogen discharged by fish in water

中文关键词: 鲫鱼  氨氮  温度  MS-222  改性沸石

英文关键词: Carp  Ammonia  Temperature  MS-222  Modified zeolite

中文摘要:

      采用密封静水式测定仪，探讨了低温、MS-222对鲫鱼排氨率的降低作用及盐改性沸石对水体中氨氮的去除效果，以延长鲫鱼运输贮运的保活时间。结果表明，温度、麻醉剂（MS-222）、改性沸石对水体氨氮的降低都有显著的作用。10~30℃范围内,鲫鱼的排氨率随温度的降低而减少（P<0.01），水温30 ℃时的排氨率是10℃时的5.11~6.44倍，排氨率与水温的关系可以表示为Y=-c+b1X+a1X2，温度和体重的交互作用对鲫鱼排氨率也有极显著的影响(P<0.01)。MS-222质量浓度0~80 mg/L范围内,鲫鱼的排氨率随MS-222质量浓度的增加而减少（P<0.01），MS-222质量浓度为80mg/L的实验组与对照组（0 mg/L）相比，排氨率降低了54.1%~51.1%，MS-222质量浓度与排氨率的关系可以用回归方程式Y=-c-b1X+a1X2表示。经NaCl浸泡的沸石可以有效去除水体中的氨氮，浓度大于60 g/L后，去除率渐渐趋于稳定，采用加热方式，NaCl质量浓度80g/L时氨去除率达到最大值，并在24 h内持续地保有对氨氮的吸附作用。

英文摘要:

      The effect of low-temperature, MS-222 on ammonia excretion rate of Carp and percentage of ammonia-nitrogen removal on zeolite modified by salt were studied using water static seal-type detector by self-made aiming at extending time of keeping Carp alive during the transportation and storage. The results showed that the ammonia excretion rate of Carp decreased with water temperature decreasing at 10~30℃（P<0.01）,it at 30℃ was 5.11~6.44 times that at the low 10℃, their relationships with temperature could be represented by polynomial Y=-c+b1X+a1X2, their interaction of temperature and body weight had significant effects on the ammonia excretion rate (P<0.01). The ammonia excretion rate of Carp decreased with MS-222 concentration increasing at 0.80 mg/L（P<0.01）, it at MS-222 concentration of 80ppm decreased by 54.1%~51.1% comparing with the control group, the relationship with MS-222 concentration could be represented by polynomial Y=-c-b1X+a1X2. The zeolite soaked by NaCl could effectively remove ammonia in water,percentage of ammonia removal was gradually stable when the NaCl concentration of was greater than 60 g/L, percentage of ammonia removal reached the maximum when the NaCl concentration was at 80 g/L, and modified zeolite by salt was able to remove efficiently ammonia-nitrogen in water continuously within 24 h.