Where are the world's four most famous fishing grounds? What are the reasons for their formation?

There are four traditionally famous fishing grounds in the world, known as the ? These four major fishing grounds, the number of fish species is huge, the production is huge, is an important source of important marine fish in the world, but also an important part of the economy of several countries, the formation of the world's four major fishing grounds are mainly are affected by the ocean currents in the cold and warm currents convergence, will be a large number of plankton gathered here or suitable for a large amount of growth of plankton, for a variety of herbivorous fish to provide a plentiful source of food, and a large number of Herbivorous fish and provide food for carnivorous fish, which leads to these four areas, fixed life with a large number of fish, coupled with easy to catch, the formation of the world's four major fishing grounds,

a, due to the influence of the ocean currents

The existence of the ocean in the warm and cold currents, the cold currents of seawater sink, the warm currents of seawater rise, so that the formation of the ocean's warm and cold currents, the cold currents of seawater rise, the cold currents of seawater rise, the cold currents of the cold currents of the sea. Warm current seawater rises, so the formation of a huge movement force, this movement will be a certain area of the sea water will be strongly churning, and still vertical type angle, so that the nutrients will be brought to the surface of the sea bottom, coupled with sufficient sunlight, will make a variety of plankton growth, for a variety of herbivorous fish to provide sufficient bait, and a variety of herbivorous fish and carnivorous animals to provide sufficient food, the Hokkaido fishing area here in Japan, the Hokkaido fishing area. The Hokkaido fishery here is the confluence of the Japanese warm current and the Chishima cold current; the Newfoundland fishery located in the Atlantic waters of northeastern North America is the result of the confluence of the warm Gulf of Mexico current and the Labrador cold current; and the North Sea fishery located in the northwestern part of Europe is the result of the confluence of the warm North Atlantic current and the cold seawater flowing southward from the Arctic Ocean. Located in the western Pacific waters of South America's Peruvian fishing grounds, and the other three fishing grounds is due to the convergence of cold and warm currents and the formation of different, due to the Peruvian cold current is an upward cold current, in the vertical direction of the sea water from the sea floor to the surface of the movement of the seawater, the upward movement of the sea water will be the seabed silt and other nutrients upward to the formation of a wealth of plankton, for a large number of cold-water fish to provide the bait. This creates a world-class fishing ground.

Two, adequate sunlight,

Marine fishery resources are mainly concentrated in the coastal continental shelf waters, that is, from the coast to the continental seabed part of the depth of about 200 meters to 300 meters underwater, this area is more sunny, good water quality, water temperature is appropriate. This makes the photosynthesis of organisms can be completed very well, plus the rivers into the ocean will bring a lot of nutrients, so that the plankton can reproduce quickly, and this distance makes the surrounding human activities less, suitable for the growth of fish, but not far from the mainland to facilitate the capture of human beings.

But as human commercial demand increases and as human demand for the ocean increases, the production of the four major fisheries has begun to decline vertically, located in North America's Newfoundland fisheries, due to a long period of time fishing, the current fishery resources have been greatly reduced is already close to depletion,