The Regulations Governing Permission and Management of Guns, Ammunition, Knives and Weapons Article 8

People may purchase and use harpoon guns, but each person is limited to two only. However, their purchase and use shall be prohibited if any of the following circumstances is met:1. Being a minor.2. Having finally been sentenced to imprisonment or given a more severe punishment.3. Having been declared to be under guardianship or assistance, and the declaration having not yet been revoked.Whenever going out with a licensed harpoon gun, the owner shall carry the license with him.When the registered household location is changed, the harpoon gun owner shall, within one month following the day when the change occurs, submit the license, declaration form for domicile change, to the former and current local police stations respectively which will then forward them to the municipal, county (city) police department to register the change.
中文原文 槍砲彈藥刀械許可及管理辦法第8條
人民得購置使用魚槍,每人以二枝為限。
但有下列情形之一者,不得購置使用:
一、未成年。
二、判處有期徒刑以上之刑,經確定。
三、受監護或輔助宣告,尚未撤銷。
持有人攜帶經許可之魚槍外出者,應隨身攜帶執照。
持有人之戶籍所在地變更時,應於變更之翌日起一個月內連同執照、異動申報書,分別報請變更前、後之警察分駐(派出)所層轉直轄市、縣(市)警察局辦理異動登記。

English translation for reference only; the Chinese text prevails. Not legal advice.