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临床症状患病初期,病鱼胸鳍侧有直径为3~5毫米的损伤,外部如针状的创伤,并深入到肌肉。病鱼头朝上尾朝下悬挂于水中,有时呈痉挛式螺旋游动,继而死亡。因鮰鱼规格和个体免疫力等差异,鮰类肠败血症的临床症状不尽相同,表现出急性型和慢性型两种形式。急性型死亡率高,主要表现为败血症和肠炎。病鱼停止摄食,游动缓慢,离群独游,或头朝上悬挂水中;患病鮰鱼体表出现褪色斑,腹部肿胀,眼球突出,
Early onset of clinical symptoms, sick fish pectoral fin diameter of 3 to 5 mm of injury, such as external needle-like trauma, and deep into the muscles. Head and tail disease head hanging downward in the water, spasmodic spiral sometimes swimming, and then died. Due to the differences in the size of the tuna and the individual immunity, the clinical symptoms of the intestinal type of enteric septicemia are different, showing both acute and chronic forms. Acute type of high mortality, mainly for sepsis and enteritis. Diseased fish stop feeding, swimming slowly, outing alone, or head-up suspension of water; sick catfish body surface faded spots, abdominal swelling, prominent eyes,