Recently, the network exposed that a fishing boat in Lusi New Port, Nantong, Jiangsu Province, caught a large shark, from the images transmitted by the network and insiders revealed that this shark weighs about 4 tons, and there is no doubt that it is a large shark. However, this shark was probably too close when the fishermen were fishing, and as a result, they were caught in the net, so they died when they came out of the water, and have now been handed over to the animal protection department.
Staff from the Jiangsu Provincial Institute of Oceanography have rushed to The town of Lusigang to further study whether sharks are made into specimens or harmlessly treated. This kind of accidentally caught shark is made into a specimen to warn people.
Sharks are an important species for marine ecology, they can eat scavenger, so they can clean up the remains of large marine animals floating on the ocean; sharks are aggressive and can prey on smaller fish, so they can maintain the stability of the ecological environment and avoid excessive breeding of a certain species.
However, due to human activities, the survival of sharks has also encountered some crises, human ocean or offshore fishing will affect the shark's natural habitat, resulting in a reduction in shark food; and sharks are often hunted, because shark fins can be made into shark fins, and European countries also have a tradition of fermenting and eating shark meat. Therefore, in many places sharks have gradually become protected animals, and sharks cannot be hunted arbitrarily in China's waters.
Due to the influence of human activities, in 1999, three species of sharks, whale sharks, basking sharks and man-eating sharks, have been listed in the Convention on International Trade in Endangered Species of Wild Fauna and Flora, and they are strictly engaged in related trade activities to reduce the hunting of sharks by restricting the consumer market of sharks. There are many species of sharks in the waters of the South China Sea in China. In 2001, the relevant departments of Guangdong Province listed whale sharks and basking sharks as species under key protection of aquatic wildlife. Since 2004, more than 60 countries have signed contracts banning the processing and production of shark fin soup.
There are many legends about sharks, in fact, there are very few cases of human injuries and deaths caused by sharks in the world every year, they do not like the smell of humans, and occasionally bite people because of curiosity, but after finding that the smell is not right, they will stop continuing to attack. As an ancient creature, the physiology of sharks has many unique features, such as some sharks are medium temperature animals, body temperature remains relatively stable in a certain water temperature, and sharks need to find ways to maintain body temperature when they exceed the upper and lower temperature limits.
Shark teeth are also very special, their teeth can fall out and regenerate throughout their lives, and sometimes when they play on the beach, they can see some gray and white, sharp arrow-shaped things on the beach, which is likely to be shark teeth. Shark teeth like these are convenient for them to tear up their prey, even if the teeth are broken, it doesn't matter, it won't take long to grow back anyway. As marine predators, sharks are medium in size and skilled in swimming, but why do they die so easily in the fishermen's nets?
It turns out that sharks also have a more deadly characteristic, although sharks are also fish breathing by gills, but sharks' gills and other fish's gills are different, although there are gills, but can not be as active as the gills of other bony fish, which causes sharks can not automatically rely on the movement of gills to make the sea water contact with gills, which will kill the shark, so many sharks must swim non-stop, so that water can be poured into the shark's gills with their own pressure, and the sea water flows through the gills and the capillaries in the gills undergo gas exchange.
Sharks, as a kind of marine hunting food species, are not so easy to die, they can even fight with dolphins and whales, very fierce, and their bodies are strong enough, otherwise they will be hit by marine mammals and their bones will be broken. Therefore, this time Jiangsu fishermen mistakenly caught sharks and caused shark deaths, there are two possibilities, one is that the trawling limits the shark's swimming, and the shark is choked to death; the other may be that there are more fish in the fishing net, and when the fishing net is lifted, the shark is under greater pressure, and the important nerve groups such as the spine are damaged and die.
Regardless of the method of death, the shark was supposed to have died, but the fishermen were not wrong, and the fisheries department responded that the cause of death was unknown. Sharks as a protected species is prohibited from hunting and processing and selling privately, China's fishermen have a high level of education, how can they deliberately hunt and show off in a high profile? If a batch of sharks is caught in batches, the purpose of the hunt is somewhat difficult to say. Some netizens also said that this shark looks more like a whale shark and is the largest fish in the ocean, but people do not have the tradition of eating this fish. Casting a net to catch fish, who knows what the net catches below the surface of the sea.
Whale sharks are mainly fished in southeast Asia and other countries, and the whale sharks caught eat their flesh and sometimes cut off their fins to make shark fins. In other areas, there is no habit of eating whale sharks, which are generally dance steps. Whether it is intentional or unquestioned capture, it also shows that humans will have a lasting impact on the marine environment. Petrel fishing and hunting technology also needs to be upgraded to try to avoid catching marine life that has been significantly reduced in populations.