Peter was quite attached to fishing. So it seems that Jesus was asking him where his true affection lay.
عِنْدَئِذٍ أَجَابَ هٰذَا ٱلتِّلْمِيذُ :‏ « نَعَمْ ،‏ يَا رَبُّ ،‏ أَنْتَ تَعْرِفُ أَنَّ عِنْدِي لَكَ مَوَدَّةً » .‏