The Seafarer Act Article 12

When employing a seafarer, the employer shall sign a written employment contract with the seafarer. The seafarer employed shall not work on board a ship until the contract is sent to the shipping administration authority for future reference. The same shall apply for the contract is terminated thereto.
中文原文 船員法第12條
雇用人僱用船員,應簽訂書面僱傭契約,送請航政機關備查後,受僱船員始得在船上服務。
僱傭契約終止時,亦同。

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