We know that there are multiple food chains in the marine world. In the ocean, with algae comes shellfish, and with shellfish comes small and even large fish ...... Most of the world's fishing grounds are offshore. This is because algae need sunlight and compounds such as silicon and phosphorus to grow, conditions that are only available in the sea close to land. deep-sea water below 1,000 meters is rich in elements such as silicon and phosphorus, but they are unable to float up to the warm surface layer. As a result, there are only a few seas of small extent where deep sea water rises automatically to the surface layer under the action of natural forces, thus making these seas rich in seaweed and dense with fish, making them rich fishing grounds.

All things considered, generally temperate sea areas have more fishing grounds. This is because the temperate sea area seasonal changes are significant, winter surface seawater and bottom seawater exchange occurs, the upward flooding of seawater is rich in nutrient salts, which is conducive to the reproduction of zooplankton. In addition, where warm and cold currents converge and cold seawater is upwelled, bait is abundant, so this area can also form a rare fishing ground.

In a broad sense, the world's five major fishing grounds, they are:

One, the North Pacific fishing grounds: including the Hokkaido fishing grounds, China's Zhoushan fishing grounds, the Hokkaido fishing grounds, North America's west coast of the many fisheries within the vast area;

2. Southeast Pacific fishing grounds: including Peru's fisheries within the vast area;

3. Northwest Atlantic Ocean Northwest Atlantic: a vast area including the Newfoundland fishery;

4. Northeast Atlantic: a vast area including the North Sea fishery;

5. Southeast Atlantic: a vast area including the fishery off the southwest coast of Africa.

Most of the world's fishing grounds in the water depth of a few hundred meters in the sea, 80% of the area belongs to the continental shelf shallow sea. So how can the ocean depths rise to the surface layer, thus creating conditions favorable to fishing? Oceanographers have found a breakthrough, they use the principle of rebound flow, in those sea areas with strong light, with artificial methods of deep seawater pumped to the surface layer, and then cultivate seaweed there, and then use seaweed to feed the shellfish, and will be processed shellfish feeding lobster. Surprisingly, the series of experiments has been a complete success.

Experts on the subject believe that the marine food bank holds great potential. At present, the highest yield of land crops per hectare of annual output converted into protein calculation, only 0.71 tons. And scientific tests of the same area of seawater feeding yield up to 27.8 tons, of which 16.7 tons also has a large commercial competitiveness.

Of course, moving from scientific experiments to actual production often encounters some unimaginable difficulties. Chief among them is the considerable amount of electricity needed to pump water from depths below 1,000 meters. How would such a huge amount of electricity be generated? Obviously, it would be difficult to meet that need under today's conditions.

However, the scientists have found the trick: they are prepared to use the difference in water temperature between the surface layer (heat source) and the deep layer (cold source) of tropical and subtropical seas to generate electricity. This is the so-called sea water temperature difference power generation. In other words, the designed marine fishery will be united with the seawater temperature difference power station to achieve the expected effect.

According to experts, because of the intense light in tropical and subtropical seas, as much as 6,250 trillion cubic meters of warm water is available for power generation in this sea area. If people use 1% of the warm water each time to generate electricity, and then pump the same amount of deep seawater for cooling, and use this power for the breeding of fisheries, you can get 750 million tons of various types of seafood each year. It is equivalent to four times the total amount of fish and meat consumed by humans in the mid-1970s. It is easy to see through these figures that it is not unattainable for the oceans to become the future breadbasket of mankind.

No country in the world has such a large capacity, and the marine industry can share this task, and the traditional fishing industry has reached or exceeded its regenerative capacity, so people can only turn to the study of the development of marine biological resources technology up, the huge marine biological resources, waiting for mankind to explore and develop.