What are the prevention and treatment methods for gill rot disease in pufferfish?

[Symptoms of gill rot disease in pufferfish] Diseased pufferfish move sluggishly, have darkened body color, have difficulty breathing, swim slowly in the upper water layer or near the pond edge, and have reduced appetite. When the gill cover is opened, increased mucus on the gill filaments is visible to the naked eye; in severe cases, the tips are decayed and defective, and some gill filaments appear grayish-white, often with mud and debris fragments attached. For microscopic examination, take a few gill filaments and mucus and place them on a glass slide, add 2—3 drops of distilled water, cover with a cover glass, let stand for a few minutes, and then observe. At the edges of the gill filaments, the bacterial cells gather into columnar or haystack-like groups, constantly twitching or swaying, and individual bacterial cells can also be seen swimming. The tips of the gill filaments are decayed, and the gill filaments are curled.

[Prevention and treatment methods for gill rot disease in pufferfish 1 ① Frequently test water quality, change water and remove waste regularly, and keep the water clean. ② Disinfect the fish fry by soaking them in a 2%-4% saline solution for 10—20 minutes. ③ Every 10—15 days, splash bleaching powder (containing more than 30% available chlorine) at 0.2-0.5 mg/L over the whole pond for water disinfection. ④ Splash furazolidone at 0.1—0.2 mg/L over the whole pond. ⑤ Splash oxytetracycline hydrochloride at 0.3—0.5 mg/L over the whole pond. ⑥ Mix 0.1—0.3 g erythromycin per kg of feed into medicated bait, halve the amount starting the next day, and feed continuously for 6 days. ⑦ Mix 0.1—0.25 g oxytetracycline hydrochloride per kg of feed into medicated bait and feed continuously for 3—5 days. ⑧ Mix 0.2—0.4 g norfloxacin per kg of feed into medicated bait and feed continuously for 5—7 days.