Possible meanings are 1) "knelt down before Jesus" or 2) "bowed down at Jesus' feet" or 3) "lay down on the ground at Jesus' feet." Peter did not fall accidentally. He did this as a sign of humility and respect for Jesus. (See: [[rc://en/ta/man/translate/translate-symaction]])
The image of catching fish is being used as a metaphor for gathering people to follow Christ. AT: "you will fish for people" or "you will gather people for me" or "you will bring people to be my disciples" (See: [[rc://en/ta/man/translate/figs-metaphor]])