Discover unexpected secrets about aquarium fish

Aquarium fishes are not as common as dogs and cats in the house, probably because people cannot cuddle.

In fact, they only swim back and forth, opening their mouths, torturing your pet cat with the prospect of having a good meal. Only that!

Discover unexpected secrets about aquarium fish

But your aquarium fish is much more hidden than what we see. Here are four things you probably didn't know about aquarium fish:

Aquarium fish used to be food

In the beginning, aquarium fish were not creatures, but they were eaten.

Modern aquarium fish (Carassius auratus auratus) is a domesticated variation of wild carp from East Asia.

The natural carp ancestor of ornamental fish is silvery gray.

Called "chi", it was once the most commonly eaten fish in China.

Gradually, the genetic transformation causes it to turn bright red, yellow, or orange.

In nature, such colors will make the fish easier to be spotted and eaten by predators.

But in the ninth century, Chinese people, mostly Buddhist monks, began to breed 'genera' in lakes, where they were not eaten by other animals.

According to legend, Dinh Diem Can's patrol found gold chi fish in a lake outside Gia Hung town. That lake later became "Ho Gia An".

According to Buddhist tradition, people often perform the liberation ceremony for good luck, especially with rare animals.

So it is becoming increasingly common not to eat these unusual colored fishes throughout China. Instead, they are released into ponds.

Official records say the release of colored genera into the pond dates back to about 975.

But for at least 100 years later, there was no difference between the colorful fish and the limb in the wild.

Unlike domestic animals, aquarium fish always avoid people and do not eat food that is dropped.

"They are subject to arrest for religious purposes," said EK Balon from Guelph University in Ontario, Canada.

Fishing coars are an incomplete technology

By about 1240, aquarium fish were kept indoors and became different from the chi fish.

They were domesticated and tolerated by human food.

In public aquariums, ornamental fish live with chi, turtle and other fish.

But for those who have the opportunity to build their own aquarium, they usually only release colorful, beautiful aquariums.

When there is a sufficient amount of fish, farmers start breeding to produce fish of the desired color.

According to Balon, the breeding started in 1163, at the aquarium of the Special Archers in Hangzhou city.

From then until the 16th century, keeping aquarium fish in a bottle became popular, because it was less expensive.

Artificial farming makes us today have about 250 different variants, described as "weird" and "weird" in the encyclopedia of animal life of Purnell, Encyclopedia of Animal Life , published in 1969.

“The list is listed in a long list: chiffon tailed fish, egg-shaped fish, astronomical fish, grouper, heaven fish, lion head fish, comet fish, then bulge, blue fish, brown fish , sparkling fish, rag tail, and more. ”

Clearly, these changes are of no benefit if they live in the wild.

Various types of aquarium fish were bred to "satisfy human satisfaction and curiosity", but their beautiful tail fins "looked good but could not be controlled" and their bodies were "full." The fat is not good, ”said research by Tomoyoshi Komiyama and colleagues from Tokai University University of Pharmacy in Isehara, Japan in 2009.

Ornamental fish are invasive species

Some aquarium fish are more vigorous than others and they are actually pests.

A study from the UK showed that at least five different ornamental fish species that were very well adapted in the ponds were copper yellow, yellow, brown, speckled fish (mixed white, red, black or yellow) and lion head fish.

While the "genus" is native to rivers and lakes in eastern and central Asia, ornamental fish can now be found throughout Europe, South Africa, Madagascar, America and the islands of Oceania and the Caribbean.

Most of them start to proliferate from the release of unpopular habitats, either because they escape the captive environment or distribution facilities.

In Europe, they are a threat if crossed with the local Crucian carp, and in Nevada, they overtake the Pahrump lake fish.

They can clean up aquatic plants due to voracious habits.

One study found that throwing them so much made the muddy mud muddy, making other creatures unable to find food.

A 2001 study showed that ornamental fish ate eggs and larvae of long-legged salamander.

Normally they don't eat eggs, but aquarium fish are quick to recognize and learn.

If other fish are found to eat eggs, they will begin to learn, and once an aquarium fish finds out, the whole aquarium community will quickly imitate them.

The aquarium fish ate the eggs and the salamander larvae so eagerly that "they alone could erase this northern Idaho reptile from some places," the researchers said.

Aquarium fishes help us understand more about vision and about alcohol

Aquarium fish have become familiar in laboratories, probably because they are easy to train and also easy to buy.

Aquarium fishes are one of the most studied animals in the field of visual recognition.

They can sense colors just like humans, something that not even primates have. So they become the ideal animal for humans to study.

The small, finger-sized aquarium fish do not even distinguish blue, but the longer they live, the more likely they are to recognize, a process quite similar to that of a human being when he was a child.

One thing we humans have is that we have three types of cells that recognize colors in our eyes, while aquarium fish have a fourth color sensor, which allows them to distinguish ultraviolet light.

Aquarium fishes are particularly effective in understanding the effects of alcohol on the brain and body.

That's because "the concentration of alcohol in the blood is very similar to the concentration of alcohol in the water they are swimming in," according to Donald Goodwin of the University of Washington in St Louis, Missouri and colleagues in 1971.

That means you can measure the drunkenness of an aquarium fish by checking the alcohol content in the water tank it is swimming in, instead of actually touching it.

In 1969, Ralph Ryback from Boston City Hospital in Massachusetts used this method to study how different wines affect the learning ability of aquarium fish.

As a result, the fish swimming in a solution containing bourbon alcohol was more affected than those swimming in a fish tank with vodka.