Regulations Governing The Approval and Administration of Direct Cross-Strait Sea Transport Between the Taiwan Area and the Mainland Area Article 12

The vessel carriers or their agencies shall, no later than 10th day of each month, prepare the vessels data for direct navigation and statistic data of carriage/transportation that they operate or entrusted in the previous month according to the format prescribed by the MOTC, and report to the Commercial Port Authority.
中文原文 臺灣地區與大陸地區海運直航許可管理辦法第12條
船舶運送業或其代理人應於每月十日前,依交通部所定格式,向航港局申報前一月所經營或代理之直航船舶及運送統計資料。

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