唐山市淡水养鱼大部分实行精养,单产水平有的每亩已突破1500kg,网箱单箱产量高的可达6000kg。由于放苗量大,加之池塘养殖时间过长,清塘不彻底,有很多池底老化及今年平均日照较少和水质污染等原因,唐山市有很多池塘及网箱养鱼发生了爆发性出血病。病鱼特征为腹鳍、背鳍下颌、体表充血、眼球突出,肛门红肿、尸检内脏充血,切开肾脏和肿胀的脾脏时有流质的内溶物流出。由于发病初期,有的 Most of the implementation of intensive cultivation of freshwater fish in Tangshan City, some yield per acre has exceeded 1500kg, cage single box high yield up to 6000kg. Due to Fangmiao large, combined with the pond farming time is too long, clear pond is not complete, there are many bottom aging and less sunshine this year and water pollution and other reasons, Tangshan City, there are many ponds and cage fish outbreak of bleeding disease. Diseased fish characterized by pelvic fins, dorsal fin jaw, body surface congestion, prominent eyes, anal swelling, visceral hyperemia autopsy, cut open the kidneys and swollen spleen fluid when the solution outflow. As early as the onset, some