Peru is located on the southeast coast of the Pacific Ocean, with a coastline of more than 2,200 kilometers. The coast of Peru is a famous fishing ground in the world. In the 1950s, Peru's fishery output reached hundreds of thousands of tons. After 1962, the fishery developed even faster, with fishing output reaching 6.96 million tons, ranking first in the world at that time. Since then, it has increased year by year. By 1970, it exceeded the 10 million tons mark and reached more than 13 million tons. Peru became a world-famous fishing country. At the same time, it attracted swarms of seabirds and accumulated huge amounts of guano layer phosphate rock on the coast and islands.
Schools of fish flock to Peruvian fishing grounds
Hundreds of thousands of tons of black manure and a large amount of fishmeal are exported every year, exchanging huge amounts of foreign exchange for Peru and becoming an important economic pillar. Peru's developed fishery has attracted world attention, and the fruitful results have surprised Peruvians.
Who created such rich fishery resources in Peru? After investigation and research by scientists, this mystery was finally solved. It turns out that it was the ocean currents that made the difference. However, this kind of ocean current is not the ocean circulation mentioned before, it is a horizontal ocean current. What forms Peru's fishing grounds is another type of ocean current that flows in a vertical direction, called upwelling. Because the speed of upwelling is too small, it only rises about one-thousandth of a centimeter per second, and it rises less than one meter per day, making it difficult to detect. However, people slowly revealed this secret. Scientists can find its whereabouts by analyzing seawater temperature and salinity. Because the water temperature at the bottom of the sea is generally cooler and the salinity is relatively high, upwelling can bring water from the lower layers of the ocean to the surface. Therefore, in places with upwelling, the temperature of seawater is lower than the surrounding seawater. In summer or tropical sea areas, it can be 5-8°C lower than the surrounding seawater; the salinity is also significantly higher than the surrounding seawater. Therefore, as long as you find a sea area where the water temperature is lower than the surrounding seawater and the salinity is higher than the surrounding seawater, you can generally conclude that there is an upwelling here. The upwelling moves slowly because it has to overcome its own gravity, as well as the huge pressure of the seawater above and the resistance of the surrounding seawater. This is just like climbing a mountain on land, which is definitely more tiring and slower than walking on a flat road.
animal tags：
you may also like
The common name of flame spiny fish is: Shining Fairy. The posterior horn of the preopercular bone has a strong posterior spine. The body is bright red with 6 black horizontal bands. Body length 6 cm. Distribution area: Pacific tropical waters....
With the development of science, technology, economy and society, people's ability to control, transform and utilize nature has also been continuously strengthened. Artificial coasts, that is, coasts constructed entirely artificially that change the original natural state, are becoming larger...
Dolphins are small whales with teeth. People usually refer to toothed whales with a body length of about 3 meters as dolphins. There are many types of dolphins. There are more than ten types of dolphins commonly found in my country's waters, including finless porpoise, true dolphin, bottlenos...
Being cold-blooded, having backbones, gills and fins are the main features that distinguish marine fish from other marine animals. There are more than 25,000 species of marine fish. The anatomy of a fish What is a fish? Being good...
When the summer heat is unbearable, the best place for people to cool off and relax is the beach. Beidaihe, Nandaihe, Changli Gold Coast, Qingdao Huiquan Bathing Beach, Beihai Silver Beach Bathing Beach, Hainan Sanya Dadonghai and Yalang Bay are all overcrowded. Thousands of people are swimmi...
The Arctic Ocean is roughly centered on the Arctic Circle and is located at the northernmost point of the earth. It is surrounded by the European continent and the North American continent. It is connected to the Pacific Ocean through the narrow Bering Strait. It is connected to the Atlantic...
Bicolor damselfish. The vomer and jaw bones have teeth. The lateral line is interrupted, the upper lateral line is almost close to the dorsal edge of the body, and the lower lateral line extends to the base of the tail. The front half of the body is purple and the back half is yellow. Body le...
Islands are a general term for land masses of varying sizes that are above the water surface in the ocean. In meaning, a yurt is a smaller ocean land mass than an island. There is no specific boundary yet on how to divide islands and islets. In the world, only some provinces in southern my co...
Email: jsset#163.com (change # to @) Please indicate your purpose of visit! Guangdong ICP No. 2022053326 XML| map| Chinese
