Researchers from Queen's University of Belfast in Northern Ireland discovered these maverick individuals when studying the seasonal movement of the big fish, the basking shark.

Researchers once tracked four large basking sharks like school buses, labeled them with positioning labels, and recorded their locations, the temperature and depth of water they were located.

The researchers hypothesized that they would swim to coastal waters in the northern tip of Ireland in summer, because the food was very abundant there, and in winter they would swim to tropical and subtropical waters along the coast of Africa to avoid the severe cold in winter.

Researchers initially believed that water temperature must be the cause of their migration.

But to the surprise of the researchers, two of the four sharks remained in place, while the other two migrated to southern waters.

But the two sharks swam to the south did not hang out in the warm waters, but spent most of their time in deeper and colder waters.

The researchers found that every morning, the basking sharks dive into depths of 200 to 700 meters, return to the water at noon, and then dive into the cold depths again at night.

During their diving cycles, they experience an extreme water temperature range, nearly thirty degrees Celsius near the water surface and close to zero degrees Celsius in the depths of the ocean.

This makes the already elusive problem more complicated. Even if the basking sharks who choose to migrate swim to the warm south, they will still dive into the depths of the ocean and experience the cold. What is this?

Since we have to experience the cold, why bother to travel far to the south?

Eventually, some researchers suspected that the basking shark would feed in what biology calls the ‘deep scattering layer’, a layer filled with colloidal zooplankton and other things they rely on for survival.

Researchers say that at noon, the basking sharks will rise closer to the surface and bathe in warmth.

Meanwhile, sharks that remain in shallower waters near the Irish coast have neither experienced the severe cold nor the warmth because of the temperatures in winter between nine and seventeen degrees Celsius.

Unlike the sharks that chose to migrate, the sharks that remained motionless changed in depth for six months after tracing those four sharks.

As for why the two stayed and the other two traveled south, the research team has no answer yet.

Li Xuan felt that there were too many factors that were overlooked in this study. The researchers monotonically regarded water temperature as the only driving force the basking sharks to migrate. This is very unscientific, not rigorous, and even a bit nonsense.

Research on marine habitats and marine animals must include depth and distance, and the ocean must be regarded as a three-dimensional space.

The basking shark has a very large head, but its eyes are particularly small, so its vision is not very good and is distributed around the world. However, most of the basking sharks are mainly distributed in the Pacific Ocean.

There are a large number of basking sharks appearing in the Yellow Sea and East China Sea in my country. In recent years, there have been a large number of basking sharks, which are relatively rare in the southern hemisphere.

Basking sharks mainly live in warm sea areas, so few traces of basking sharks can be seen in areas with higher latitudes.

Under normal circumstances, basking sharks mainly eat some invertebrate animals and some small fish.

It is worth noting that when the basking shark eats a lot of animals, it is very large, so it consumes a lot of energy every day and requires a lot of food to replenish energy.

If you consume too little food and food, you will lack energy. In severe cases, it may cause the organs to not be able to operate well and may become life-threatening.

Therefore, the basking shark must eat enough food every day to provide motivation for life.

The basking shark's daily activity time is incomparable to other animals.

Every time during a parade, the basking shark's speed is very fast, so the organs of the basking shark's body are much more developed than other fish.

"It seems that the species in this coral reef area are even richer than I imagined. If it weren't for this sea area, there were a lot of reefs under the sea, which was not suitable for fishing boats to trawl, and there were a large number of sea lions making trouble for our fishermen.

There will only be more fishing boats on this sea surface." Li Xuan said.

Everyone nodded.

"I think the captain is right." Yang Hua nodded.

This is not a flattery, but everyone has indeed discovered it.

The waters near Xingdao are very large, both in fishery resources and in total fish.

The only drawback is that there are sea lions near Xingdao and various dangerous marine creatures, making it difficult to catch fish that was originally smooth sailing.

Fortunately, although it is a large oceanic shark, it is the second largest fish in the world after whale sharks. Occasionally, it can be seen that it has a body length of more than ten meters. The largest bass shark specimen in history was discovered in 1851.

Its length is 12.27 meters and weighs 19 tons. It was a legend at that time.

But the bass shark does not seem to want to be with the predatory sharks, and is determined to align with baleen whales. It has evolved the extremely special filter feeding habits among sharks and has become filter feeding sharks.

This way of eating can reduce energy consumption, maintain a huge body shape, and completely break everyone's inherent impression of sharks. It is called convergent evolution in biology, and is famous for filter feeding sharks.

The so-called filter feeding shark is a special shark that survives by filter feeding.

It is an animal that feeds plankton in water through filtering, including active filter feeders and passive filter feeders.

Although the bass shark eats all directions, the bass shark's predation method is very strange. It usually opens its mouth in the sea. Before eating, it first opens its mouth, swallows it with bait and water, and then uses its slender horny gills to rake it layer afterwards.

A layer of "sieve" is used to filter, and even those tiny fish and shrimps are hard to escape.

This predation method is destined to be without danger to humans.

But sea lions are different.

One of the best friends of humans promoted in this kind of aquarium is a real troublemaker. When ordinary fishermen encounter them, they can only admit that they are unlucky.

"Brother Xuan, then should we continue to cast the net or continue to do homework under the water?" Chen Bin looked at Li Xuan. At this time, he had completely returned to normal. The fear brought to him by the basket shark seemed to be

He did not form a shadow in his heart.

Li Xuan pondered for a moment, then looked at Yang Hua and asked, "Uncle Yang, what do you think?"

Yang Hua waved his hand. Although he was a commander of the engine, he usually never expressed his own opinions. "You are the captain, you can do whatever you say, I can do it."
Chapter completed!