Abstract: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.
