[jimuk]

Well as you can see below, Jesus used this terminology whilst looking for followers to help him in his ministry, these guys were fishermen but instead of gathering in fishes he wants them to gather people and preach the word of god to them, for their everlasting salvation.

Mark 1:16-20 "As Jesus walked beside the Sea of Galilee, he saw Simon and his brother Andrew casting a net into the lake, for they were fishermen. 'Come, follow me,' Jesus said, 'and I will make you fishers of men.' At once they left their nets and followed him. When he had gone a little further, he saw James son of Zebedee and his brother John in a boat, preparing their nets. Without delay he called them, and they left their father Zebedee in the boat with the hired men and followed him."