fisherman; fishing boat crew member
Specifically refers to a person who works as a crew member on a fishing boat, not a recreational angler.
He has been working as a fishing boat crew member for over ten years.
漁師 is a general term for a fisherman, including those who fish from shore or small boats, while 漁船乗組員 specifically denotes a crew member on a fishing vessel.
Compound of 漁船 (fishing boat) + 乗組員 (crew member).