Enforcement Rules of the Customs Act Article 31

In order to exempt marine products caught overseas and shipped back from Customs duty pursuant to Subparagraph 10 of Paragraph 1 of Article 49 of the Act, the importer shall submit the certificate issued by the central competent authority for marine affairs or the institution or person authorized by the central competent authority for marine affairs.The maximum quantity of the marine products caught at sea and shipped back that is exempt from Customs duty pursuant to the second part of Subparagraph 10 of Paragraph 1 of Article 49 of the Act, shall be determined by the MOF after consultation with the central competent authority for marine affairs.
中文原文 關稅法施行細則第31條
依本法第四十九條第一項第十款規定,在海外捕獲之水產品申請進口免稅,應檢具中央漁業主管機關或其委託之機構、人員出具之證明文件。
依本法第四十九條第一項第十款後段規定,在海外捕獲運回之免稅水產品,其數量應先經財政部會商中央漁業主管機關同意後核定之。

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