初期为食欲下降，体表失去光泽，变成没有透明感的青白色。

During the initial period of the disease, loss of appetite, loss of surface luster, becoming there is no clear sense of the Qing Baize.

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随着寄生范围的扩大，体表失去光泽，粘液分泌量增多，鱼因食欲减退而变得虚弱。

With the expansion of host range, surface of fish becomes dull, mucus secretion increase more, and the fish become weaker due to loss of appetite.

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