Question

Why rich fishing grounds have developed near area where warm and cold ocean currents meet?

Answer 1

 A lot of planktens or sea weeds grow in areas where the cold and warm currents meet. Hence, it is a habitat of aquatic animals like fishes. so, fishes are present in  huge amount here. so, fishing grounds areea  located where warm and cold ocean currents meet

Answer 2

When a warm current and cold current meets , due to the warm nature of warm current , it rises over the cold current and the cold sinks.

Thus there is a struggle between the currents.

This results in the formation of fog due to the meeting of the warm and cold currents.

This formation of fog attracts planktons.

Planktons are food for fishes.

Hence fishes are attracted towards these areas.

This is the reason why the Oyashio current form the richest fishing grounds.