Epithelial cells necrosis and abscission in the lamellae, there are bacterials. 1-capillary blood vessel, 2\,3-bacterials.

• 鳃小片上皮细胞发生坏死脱落，毛细血管裸露，其上粘附有细长的细菌.；1-毛细血管，2、3-细菌