ˈseafishery The business or occupation, etc. of catching fish in the sea (see fishery 1). Also pl.attrib., as in Sea Fisheries Act. 1865L. Young Sea-Fishing v. 185 History of Sea-fisheries.1868Act 31 & 32 Vict. c. 45 §2 This Act may be cited as The Sea Fisheries Act, 1868.