Disease Outbreaks and Emergency Treatment After Introducing Inferior Quality Rice Field Eels into Eel Ponds or Net Cages

(1) Disease outbreak situation: After inferior quality rice field eels are introduced into eel cages or eel ponds, they generally develop disease within 2 to 7 days, and mass mortality occurs around 12 days. When disease breaks out, a method combining Chinese herbal medicine and chemical fishery drugs should be used for treatment to control the infection.

(2) Emergency handling: ① Search for and remove floating-head eels, exposed-body eels, and dead eels 2 to 3 times during the daytime each day; ② Change the water once every morning and thoroughly inspect for and remove dead eels; ③ At night each day, use electric light for illumination and search for and remove diseased eels from aquatic plants 1 to 2 times.

(3) Emergency treatment: ① Take equal parts of fresh water pepper (Persicaria hydropiper), creeping euphorbia (Euphorbia humifusa), seashell-containing pearl (Phyllanthus urinaria), and yerbadetajo herb (Eclipta prostrata), tie them into several small bundles, place them in the net cage or eel pond, soak for 5 to 7 days, then remove; ② From the day the disease begins, apply 0.25 mg/L furazolidone to the entire pond at a rate of 0.25 mg per cubic meter of water, once a day for 3 consecutive days; ③ When the condition is especially severe, apply 0.3 mg/L chlorine dioxide A and B activators to the entire pond 1 to 2 times, once daily.