Being fishers of men means bringing people to Christ. Laying the seed of the Gospel. People who say the prayer of salvation are the fishes. Those who bring people to GOD are the fishermen. The fishes who are thrown away are those that accepted Christ but did not walk through the narrow path. Those who came to God but did not have a relationship with him. which is why people will say I did this in your name and that in your name but at the end he will away from i never knew you.