Usage patterns
〈人〉は漁師になるto become a fisherman
He became a fisherman, following in his father's footsteps.
漁師が〈物〉を捕るa fisherman catches something (fish, shellfish, etc.)
The fishermen catch fish early every morning.
漁師として〈動詞〉to do something in one's capacity as a fisherman
He has lived at sea for many years as a fisherman.