Easy to use: small volume and light weight, simple operation, can be used, hanging clip, binding and magnetic adsorption of various carrying mode.

使用方便：体积小、重量轻，操作简单，可采用吊挂、夹扣、捆绑和磁力吸附等各种携带方式。

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The external tags including nose label, fin clip, binding card and branding mark are provided with the advantages of simplicity, easiness and low cost, but their retentions are comparatively lower.

外标法主要包括鼻签、剪鳍、挂牌、烙印等，具有简便易行、成本较低等优点，但标记的保留率相对较低；

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