<h1 class="pgc-h-arrow-right" data-track="12" >1 non-cannibal "piranha"</h1>
When it comes to piranhas, I wonder what comes to mind in the first picture in everyone's mind? Is it the mysterious and terrifying-looking strange fish in the American horror science fiction film "Piranha"? Or is it the piranhas in the documentary who flock to divide and eat a cow?
Piranhas
The horrific image of the piranha has been deeply rooted in people's minds, but we will talk about the piranha later, first of all, about the close relatives of the same family of fatty carps, "saw-belly fat carps". "Sawfish are freshwater fish that can grow up to nearly 1 meter. Usually its food is nuts, cores, aquatic vegetation and snails that fall from trees. Because of this, in order to crush these foods, sawfish have evolved relatively peaceful and powerful teeth. Similar to our human teeth. So, "Fish don't look." "I'm ugly, but I'm gentle."
Dramatic belly carp
<h1 class="pgc-h-arrow-right" data-track="12" > the origin of "egg-cut fish"</h1>
Saw belly carp has an alias called "egg cutter fish". The earliest was based on a report in the British "Daily Mail". The report said that an "egg-cut fish" that likes to bite the intimate parts of men and looks like a piranha has surprised the Seine. In 2011, two male fishermen in Papua New Guinea were bitten by sawfish in the lake and bled to death. Speaking of which, do you guys feel a tight thigh and have since listed the sawfish as one of the creatures you least want to see?
In fact, male compatriots do not have to worry too much when they encounter saw-belly fat carp, and generally saw-belly fat carp will not attack humans if they are not very hungry. "Egg cutting" is a change in the food chain in a certain area, and sawfish are normally docile fish! If you really can't rest assured, you can try to wear a few more pairs of pants. As for why? Oh, this requires the officials to use their imagination.
The teeth of the saw belly carp
<h1 class="pgc-h-arrow-right" data-track="12" > What if you mistake piranhas for sawfish in the wild? </h1>
As we said before, sawfish and piranhas are close relatives and look very similar. So what if we can't tell the difference between piranhas and sawfish in the wild? First of all, let's judge from the size of the man-eating pomfret, which is relatively small compared to the saw-belly carp, and the general length is about 14 to 26 cm.
Red-bellied piranha
However, there have also been reports of sightings of 43-centimeter-long piranhas. Another way is to look at the belly of the fish. The bloodthirsty madness that is often circulated on the Internet, which can gnaw people or animals into white bones in tens of seconds, usually refers to the "red-bellied piranha". Its characteristics can be seen from its name. Its belly must be red, so if we encounter a red-bellied, particularly fierce-looking fish in the wild, it is the legendary piranha. If you have leisure and elegance, you can also catch a tooth to look at it, if it is the same as your teeth, it is a sawfish, if it is a sharp fang, then congratulations on winning the lottery, you have encountered a piranha, and, if you are not careful, it is very likely that it will kiss you.
However, do not panic when encountering piranhas, they generally do not attack humans, and The Chinese "couple" and a biologist have done experiments and concluded that piranhas generally do not attack humans. If you have wounds on your body, I suggest leaving the experts alone and going ashore first. After all, small lives matter.
Biologists test the piranha's aggressiveness by stepping into a pool after starving the piranha for three days
<h1 class="pgc-h-arrow-right" data-track="12" > biological evolution and biological invasion</h1>
Piranhas and saw-bellied carp belong to the same family of lipocarbons, but seem to have evolved into two completely different creatures. There are other fish in nature with similar teeth to humans, such as a common trigger fish in Malaysia, which was taken by an unknown foreign netizen and published on social platforms. The image was widely shared on social media since it appeared. A netizen with a relatively clear brain circuit once joked that "look at its lips, it looks very good kiss!". Well, there's that picture.
Fish with human teeth
See, in order to adapt to various living environments, various creatures in nature have evolved various functional organs. Mammalian whales, in order to adapt to the sea, evolved iron lungs. And a complete system that can survive in the sea for a long time. Geckos evolved renewable tails. Chameleons evolved pigment cells that could change their color based on their surroundings and their own emotions. It took these creatures tens of thousands, if not hundreds of thousands, of years to adapt to their environment to evolve into what we see today. Really have to sigh the magic of nature.
But in the past hundred years, with the development of human trade. There are many creatures in the world, following human cargo ships, trains, and planes. Step into a land they have never set foot on for generations.
Often the arrival of alien species is a disaster for the local biological chain. Because the formation of a relatively stable biological chain in each environment is the result of the selection of the survival of the fittest for tens of millions of years of local animals and plants. An alien species would be like aliens coming to Earth to the local biological chain. For example, the sawfish, which was originally active in the Amazon Basin, why did it appear in the United Kingdom? Originally it was circulated as an ornamental fish in the UK, but when it is raised, the sawfish is too large and will be abandoned by its owners. Then the name "egg-cut fish" was born. There's also the recent flood of carp that has left Americans helpless, which is typical of biological invasions.
Human beings want to develop, and this kind of thing is inevitable. But it is still necessary to guard against it. Therefore, various countries have also introduced relevant laws. Article 60 of China's Biosecurity Law stipulates that no unit or individual may introduce, release, or discard alien species without approval.
But the most important thing about this kind of thing depends on the self-consciousness of our citizens. Okay, let's talk about it today, you have any questions and ideas can leave a message in the comment area below. [Than heart]