Question

Why do regions where cold and warm currents meet considered rich for fishing?

Answer 1

because hot and cold current meet there and becomes a fishing ground

Answer 2

when the cold and warm current meet at a region, it makes the region very foggy which helps in the growth of plankton which is a food for fishes. hence the major fishing areas are at these regions. for example -Grand Bank near Newfoundland where gulf stream and Labrador current meet