What are the reasons why China s coastal fisheries are facing depletion?

Due to the increasing "desertification" of the Bohai Sea, which is the main spawning ground, nursery ground and feeding ground for many kinds of fish and shrimp, the fishery resources of the Yellow Sea, the Bohai Sea and even the East China Sea have been delayed for a long time, and due to the combined impact of human factors such as long-term overfishing and water pollution, sea-related engineering construction, the fishery resources of the Bohai Sea have seriously declined, the ecological structure has been seriously damaged, the biodiversity has declined significantly, the species composition tends to be miniaturized and low-quality, and the resource production function has been seriously degraded.

The structure of biological reproductive populations is miniaturized and younger. In recent years, many of the small yellow croakers and small hairtail fish caught by fishermen are only one year old. The younger age of the spawning population reduces the spawning capacity, resulting in a decrease in the amount of resources replenished, and eventually leads to the depletion of fishery resources in the Bohai Sea.

To sum up, there are: desertification, overfishing, water pollution, and the young age of the fish caught, which reduces the amount of resource replenishment.

First of all, it should be clear what the cause of depletion is.1 Overfishing, the hole size of the fishing nets is getting smaller and smaller, so there are fewer and fewer of them. 2. Marine chemical pollution, which is the deadliest. Many fish are unable to adapt to chemical contamination and die of poisoning.

3. Feed on the sky, thousands of people fish every year, but never feed. The third is the best solution, in some restaurants, collect the leftovers of the day, remove the floating grease and throw it into the sea. It can provide abundant bait for marine fish.

Of course, be careful not to throw acidified and spoiled food into it, and also watch out for fish parasites. It's just that the sea belongs to the public, and ordinary people are not willing to invest money and effort!

Overfishing and marine pollution.

Due to the large number of fishermen caught in recent years.

a.Bohai Sea. b.Yellow Sea.

c.Tokai (correct answer).

d.South China Sea.

Pollution is the most harmful to inshore fisheries and coastal aquaculture.

Pollution is the most harmful to inshore fisheries and coastal aquaculture. Due to economic development, urbanization and population growth, in recent years, the pollution caused by industrial, agricultural and urban domestic wastewater in coastal areas has become more and more serious, and a large number of pollutants continue to enter the ocean and coastal waters, which has a significant impact on fisheries and muliang aquaculture.

Marine pollution has seriously damaged the marine ecological environment, resulting in a decline in the number of large marine limb species and a serious shortage of marine fishery resources, which has seriously affected the income of fishermen.

The most harmful to inshore fisheries and coastal aquaculture are: ().

a.Storm. b.Sea ice.

c.Red Tide (Correct Answer).

Answer] B Answer Analysis] Test Analysis: The most developed freshwater fishery in China is the middle and lower reaches of the Yangtze River with many rivers and lakes and a vast water area, and the eastern coastal areas are developed marine fisheries, but not freshwater fisheries, and the middle and lower reaches of the Yellow River are underdeveloped due to the small amount of water and unstable, and the Pearl River Delta lakes are smaller and less than the middle and lower reaches of the Yangtze River, so the middle and lower reaches of the Yangtze River are also known as the "land of fishing rice", so choose B.

Test point: This question examines the fishery in the middle and lower reaches of the Yangtze River in China.

China's largest fishing ground - Zhoushan Fishing Ground.

The reason for the development of the fishery in our country.

1.The continental shelf is wide and shallow, with suitable water temperature and abundant sunlight, which is conducive to the growth of plankton and provides abundant food for fish.

2.Runoff into the sea (Yangtze River) brings abundant organic matter and nutrients.

3.The cold and warm currents meet, the sea water is stirred or the sea water is flooded in winter, and the nutrients are abundant.

4.Temperate seas.

natural factors; China has a long coastline, many fishing grounds, and monsoon currents bring abundant bait, and cold and warm currents converge.

social factors; The market demand is large and has a long history of fishing.

China's marine fisheries occupy an important position in the world, among which continental shelf fisheries account for almost 1 4 of the world's developed continental shelf fisheries 4 The Yellow and Bohai Sea fisheries, Zhoushan fisheries, the South China Sea coastal fisheries and the Beibu Gulf fisheries are the four major fisheries in China, among which the Zhoushan fishery is the largest

So the answer is: on the continental shelf; Zhoushan Fishing Ground