Русско-англо-русский юридический словарь

A factory ship, also known as a fish processing vessel, is a large ocean-going vessel with extensive on-board facilities for processing and freezing caught fish or whales. (Wikipedia)

Factory ship, also called Mother Ship, originally, a large ship used in whaling, but now, more broadly, any ship that is equipped to process marine catches for various consumer uses. (Britannica)