Enteritis in Fish: Symptoms, Epidemiological Characteristics, and Detailed Prevention and Treatment Methods
What are the symptoms, epidemiological characteristics, and prevention and treatment methods of enteritis in fish?
(1) Pathogen The cause has not been fully confirmed. However, most scholars believe that this disease is caused by Aeromonas punctata, so it is also called bacterial enteritis or rotten-intestine plague.
(2) Symptoms The diseased fish initially appears listless and floating, moves slowly, stays away from the group, is anorexic, and may even lose its appetite. The body darkens, most noticeably on the head and tail fin. Red spots appear on the abdomen, and the anus becomes red and swollen. In the early stage, it excretes white thread-like mucus or becomes constipated. In severe cases, pressing the abdomen lightly causes bloody-yellow mucus to flow out. When the diseased fish is dissected, the intestines can be seen to be inflamed and congested, and may even turn purple, so death follows quickly.
(3) Epidemiological characteristics The disease occurs mostly from April to October.
(4) Prevention and treatment methods ① Avoid feeding spoiled or deteriorated bait, and prevent overeating and exposure to cold. ② Dissolve 0.1-0.2 g of nitrofurazone or furazolidone in 5 L of water, and bathe the diseased fish for 20-30 minutes once a day. For routine prevention, antibiotic drugs such as oxytetracycline 0.25 g, tetracycline 0.25 g, or norfloxacin 0.1 g can also be used; the dosage is 2 capsules in 50 L of water, bathe for 2-3 days, then change the water. ③ Splash nitrofurazone or furazolidone solution over the whole pond, with a dosage of 0.1 g per 50 L of water. ④ Mix 0.1 g of furazolidone per 1 kg of fish body weight into artificial bait and feed it to the diseased fish once a day for 3-4 consecutive days.
(2) Symptoms The diseased fish initially appears listless and floating, moves slowly, stays away from the group, is anorexic, and may even lose its appetite. The body darkens, most noticeably on the head and tail fin. Red spots appear on the abdomen, and the anus becomes red and swollen. In the early stage, it excretes white thread-like mucus or becomes constipated. In severe cases, pressing the abdomen lightly causes bloody-yellow mucus to flow out. When the diseased fish is dissected, the intestines can be seen to be inflamed and congested, and may even turn purple, so death follows quickly.
(3) Epidemiological characteristics The disease occurs mostly from April to October.
(4) Prevention and treatment methods ① Avoid feeding spoiled or deteriorated bait, and prevent overeating and exposure to cold. ② Dissolve 0.1-0.2 g of nitrofurazone or furazolidone in 5 L of water, and bathe the diseased fish for 20-30 minutes once a day. For routine prevention, antibiotic drugs such as oxytetracycline 0.25 g, tetracycline 0.25 g, or norfloxacin 0.1 g can also be used; the dosage is 2 capsules in 50 L of water, bathe for 2-3 days, then change the water. ③ Splash nitrofurazone or furazolidone solution over the whole pond, with a dosage of 0.1 g per 50 L of water. ④ Mix 0.1 g of furazolidone per 1 kg of fish body weight into artificial bait and feed it to the diseased fish once a day for 3-4 consecutive days.