It took Hackett 25 minutes to fish the giant goldfish ashore. After weighing, this goldfish weighs 67 pounds and 4 ounces (about 6 1 kg), breaking the data of 20 19, and is called the largest goldfish found so far.
This is not the first time that a large goldfish has been found in France. As early as September 20 10, a French angler, Rafael Biaggini, caught a giant goldfish weighing 30 pounds (about 13.6 kg) in a lake in the south of France, which was considered as the largest goldfish in the world at that time.
As our most common ornamental fish, goldfish is relatively small in size in our impression, which is precisely why it can become the most popular ornamental fish. Why are there such big goldfish abroad? In fact, there is a misunderstanding because this goldfish is not another goldfish.
Goldfish is an ornamental fish, which originated in China. According to documents, when Huan Chong visited Lushan Mountain in Shanxi Province, there were red-scale fish in the lake, among which red-scale fish was actually the ancestor of goldfish. It can be seen that goldfish is a natural variety, but it is difficult to preserve this variety in nature, because the bright body color is most easily found by natural enemies such as waterfowl. But fortunately, the ancients in our country saw these fish of different colors and then cultured them artificially, so that the genes of goldfish could be continued.
The earliest ancestor of goldfish is actually golden crucian carp (also known as grass goldfish), which is a natural variety of wild crucian carp and is caused by genetic mutation. As early as 1950s, scientists had already reached a conclusion through the hybridization experiment between goldfish and crucian carp, which was further confirmed by the development of science and the progress of genetics.
Because animals are more prone to genetic mutations under artificial breeding, and those mutations that are not conducive to the survival of animals even in the wild environment will be preserved under the protection of people, today's goldfish are diverse in shape, with more than 300 different varieties.
Find out the real goldfish, and then look back at the biggest goldfish caught this time, and you will find the problem. From the above picture, we can clearly see that the mouth of the "big goldfish" has a beard, and combined with their overall size, it is obviously like a carp.
In fact, koi fish, like goldfish, has one of the earliest producing areas, and that is China. At least before the Ming Dynasty, we raised koi fish by raising goldfish. Of course, strictly speaking, natural varieties appear first, and then artificial breeding. In the Ming Dynasty, koi fish became an ornamental fish as common as goldfish in China.
However, the biggest koi fish the French caught this time was not from China, but from Germany. This is a German koi fish. The so-called German koi fish refers to a kind of koi fish fish (non-species) bred in Germany, which is very popular in Europe. As an ornamental fish, it was introduced into many ornamental waters in France, and the German koi fish caught this time was put into the fishing lake as an ornamental fish by its owner.
German koi fish, though not directly from our country, has the credit of koi fish. Why do you say that? First of all, German koi fish is a cross between German koi fish and Pi carp.
Leather carp, also known as patterned leather carp, has many strains all over the world, among which German strains are mainly iron powder and giant water, which are produced by crossing European wild carp and golden carp.
The origin of German koi fish is a little more complicated. It is a cross between German leather carp and japanese koi, in which German leather carp is a natural variety of European wild carp, and the scattered mirror carp is caused by a pair of gene mutations that control the scale length of European wild carp. Under normal circumstances, the scale gene expression of European wild carp is SSnn, in which S is a recessive gene. When it becomes a dominant "S", there will be a local phenomenon of its scale.
Of course, in the gene mutation of fish scales, not only the S gene will change, but also the N gene will change. Once the N gene mutation occurs, another mirror carp, the line scale mirror carp (gene expression is SsNn), appears. If two kinds of mirror carp cross, if an individual whose gene expression is SSNn is produced, it is German leather carp.
In fact, japanese koi was introduced to Japan from ancient China and was further cultivated in Japan. German koi fish was obtained by crossing German leather carp with japanese koi. At last, German koi fish crossed with Pi carp, and today our protagonist appeared.
Recently, the "biggest goldfish" has attracted much attention, but in fact, that "goldfish" is a German koi fish. You know, carp itself is much bigger than the predecessor of goldfish. In addition, their average life span is between 20 and 25 years. If you put them in a cultured lake, they have enough food and no natural enemies. It is not surprising that they have grown so big.
Moreover, the real biggest goldfish weighs about 2 kilograms. After all, it is domesticated by crucian carp, and its body shape is restricted by the largest body shape gene of its ancestors.