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A recent mortality event of YFSBAD and the clinical symptoms of naturally infected large-sized yellowfin seabream (80~140 g per fish). (A) A recent outbreak of YFSBAD in a local farm in Zhuhai. (B) The diseased fish were characterized by swollen abdomens, ascites, splenomegaly, and petechial to ecchymotic hemorrhage in the liver. Over 2 mL of ascites were extracted from each fish. The red arrows indicate enlarged spleens. The black arrows indicate bloodless liver.
