In the bluewater lake of the Champagne region of France, there is a goldfish about the size of a person, it is 20 years old this year and weighs 30 kilograms. Why can goldfish grow so big, and can it grow indefinitely?
Bluewater Lake is a famous fishing lake in the area, as early as 20 years ago, the British director of Bluewater Lake, Jason Cowler, cast a rich variety of fish fry in the lake, and personally put a mixture of European carp and koi into the lake. After years of cultivation, many large carp have already grown in the lake.
However, large goldfish like this are rare. It is understood it was fished by Andy Hackett, a British company director. Before coming to Bluewater Lake, this "carrot" king fish had already been discovered, but he never thought that he would be the lucky one who could catch the king fish.
Many people may be wondering, why can goldfish grow so big?
In fact, this is related to the unique fishing rules of foreign countries. First of all, Europeans have much stricter fishing regulations than at home, they need to apply for a fishing license, for example, in Germany there will be two exams a year, Germany fishing does not charge any fees, but can not catch those protected fish and fish of unqualified size.
You may think that this kind of exam is just a show, but in fact, not only do you have to pay a 240 euro registration fee, but you also have to learn a lot of fish knowledge, be able to remember many types of fish, know the minimum size of legal fish, be able to identify the type of fish, and memorize the breeding period of various fish. It can be said that the difficulty of getting a fishing license is comparable to getting a driver's license.
It is precisely for this reason that although Europeans like fishing, they do not have the habit of taking away the fish they catch. They believe that catching a big fish is a symbol of luck, and after taking a photo with their fishing results, they will release the fish, hoping that their luck can be passed on to the next person. So the fish in these fishing lakes generally have a very long lifespan.
Take goldfish, for example, they are very adaptable and can adapt to water temperatures around 0°C, as long as the pond is not completely frozen, goldfish can survive the winter, and they can withstand water temperatures up to 30°C. And they are not picky eaters at all, from fish eggs to worms to insects, as long as their mouths can swallow animals, they eat them, plankton, algae and aquatic plants are also on their recipes.
Therefore, goldfish rarely die, and their lifespan in the wild is generally as long as 30 years. In the Great Lakes region of the United States, which lacks disease and predators, not only carp but also goldfish have also been flooded. A 2018 statistic showed that Ontario Lake, the smallest of the Great Lakes, had 40 million to 50 million goldfish.
Despite this, goldfish caught in the Bluewater Lake of France are still very rare. Because the goldfish observed in the wild can generally grow to be very large, they are basically about 2-4 kilograms, and the largest goldfish caught in North America is only 10 kilograms. A 30-kilogram one like Bluewater Lake is truly amazing.
Some people believe that this may be due to the warm local climate, the French maritime climate is obvious, and the water temperature of the blue water lake is maintained at about 15 degrees Celsius all year round. The right water temperature not only makes goldfish eat more, but also makes them less active, so they can grow this large in 20 years. #Big Goldfish##所见所得, Very Scientific ## What is the biggest fish you've ever seen ##钓鱼证 #
