Explanation:

Planktons are abundant where warm and cold currents meet. That make these areas important fishing grounds of the world. The location of major world fishing grounds is governed by many factors: Abundance of plankton, Shallow coastal waters are beneficial to fish in more than one way—

There is plentiful food supply from the erosion of continents, which provide mineral and organic matter, enough sunlight penetration, which is critical to the photosynthesis process required by plants. In areas of coastal upwelling high rates of primary production take place. Convectional mixing provide plenty of oxygen to sustain life in coastal zones as well as assuring a favourable dispersion of nutrients.Mixing of warm and cold water as on the Newfoundland 'banks' and the Sea of Japan.