题目：
简述鱼体检查的基本步骤。
答案：
参考答案：
鱼体检查的顺序是先目检再镜检，其顺序分别是：
1）体表：按顺序从头部、口腔、眼睛、鳃盖、鳍等仔细观察，检查是否有大型病原体寄生在体表；然后观察粘液、皮肤和鳍、肛门等处有无充血、出血、炎症、溃疡等。
2）鳃：重点观察鳃丝，首先观察鳃片颜色是否正常（鲜红色），其次观察粘液是否增多，再次看鳃丝末端是否肿大或腐烂。
3）内脏：以检查肠道为主。
简述鱼体检查的基本步骤。
来源：www.tikuol.com
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