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1994年,抚宁县洋河水库内网箱养殖罗非鱼108箱,网箱规格为5m×5m×2.5m,折合0.27hm~2。5月底6月初,水温升至19℃以上时开始向网箱投放50～75g/尾的罗非鱼种,每篇300～350kg;进入7月份,天气炎热,至7月中旬,连日大雨,水库水位猛涨。12天后,网箱内发现死鱼,一箱每天可见7～8尾,且死鱼逐日增多,到8月10日,每箱日死鱼已达60～70尾,当时鱼体重300～500g。上游网箱内的死鱼较下游者多。捞取在箱边离群缓游的病鱼检查发现:鱼体腹部膨大、柔软,肛门红肿,挤压腹部,有黄色粘液流出,严重的为血黄色粘液。剖开鱼腹,可见腹腔内有大量积液,肠壁充血、膨大,呈红褐色;剪开肠体,肠内没有食物,充满脓血,症状轻的个别鱼胃部有少量碎草末。取肠内脓液显微观察,可见大量杆状细菌。据上述症状诊断为肠炎病。
In 1994, 108 boxes of tilapia were cultured in the cage of Yanghe Reservoir in Funing County, with the cage size of 5m × 5m × 2.5m, equivalent to 0.27hm ~ 2. At the end of May and early June, when the water temperature rose above 19 ℃ Cage put 50 ~ 75g / tails of tilapia species, each 300 ~ 350kg; into July, the hot weather, to mid-July, heavy rains day, the reservoir water level soared. After 12 days, dead fish were found in the cages. Seven to eight pigs were seen in a box per day. The number of dead fish increased day by day. By August 10, the number of dead fish in each crate reached 60 to 70, and the weight of the fish was 300-500g. Dead fish in the upstream cage more than downstream. Fishing in the box edge of diseased fish swim inspection found: fish abdominal swelling, soft, anal swelling, squeezing the abdomen, yellow mucus outflow, severe yellow blood mucus. Cut open the belly, showing a large number of intra-abdominal effusion, congestion, swelling, reddish-brown; cut open the intestine, no food in the intestine, full of pus and blood, mild symptoms of individual fish stomach a small amount of broken grass. Take intestinal pus microscopic observation, showing a large number of bacilli. According to the above symptoms diagnosed as enteritis.