A British fishing master caught a 30kg "monster-level" goldfish in a French blue water lake, which is expected to break the world record.

According to the "New York Times" report, the 42-year-old British man Andy Hackett caught the huge goldfish. He later posted the photo on Facebook, which sparked heated discussions among netizens.

It took Hackett 25 minutes to successfully tame the goldfish, nicknamed "Carrot". But he admits the harvest was pure luck.

"Carrot" are not goldfish actually. This bright orange Jumbo is actually a cross with a koi carp. It is said to be 20 years old. A spokeswoman for Bluewater Lakes said they released the goldfish into the lake 15 years ago in the hope that anglers would catch something different.

It is understood that the "carrot" has continued to grow after living in the blue water lake, and it does not often appear on the lake.

"We always knew the carrot was in the lake, but we never thought we'd be able to catch it," said Hackett, who released it back into the lake after taking photos with the carrot.

Prior to this, the largest goldfish caught in the world was caught by people in Minnesota, USA in 2019. However, "Carrot" was 14kg heavier than the goldfish caught by the former.

Generally, goldfish can grow to about 30 cm. But the body length of goldfish has a lot to do with space, environment, and feeding. Household goldfish have limited space, so they can only grow to about 20 centimeters in general. If kept in a pond, goldfish may grow to 30 cm.

If goldfish do not have enough food and nutrients in their juvenile stages, they will develop slowly and cannot grow very large. Also, if the living environment is not suitable, it will also cause them to not grow up.

The life span of goldfish is generally 6-7 years. If the breeding environment is relatively comfortable, the food and nutrition are sufficient, and the goldfish's physique is relatively good, the life span may reach 10 years. However, goldfish have different life spans due to their many variants. Generally, goldfish with more complex variants will have a shorter lifespan. Like grass crap, which is closest to the original crucian carp, their lifespan will be relatively longer.

In a fish tank, it can generally grow to about 20-30 cm. If it is kept in a pool, it can grow to about 30-40 cm or even about 50 cm, and its weight can reach 500 grams.

The "goldfish" previously found in Germany weighed as much as 61 catties, dozens of times that of ordinary goldfish. This is not only its eye-catching place, but it also shows that it is not a "goldfish", but maybe a close relative of "goldfish".

Koi and goldfish belong to Cyprinidae biologically, and both are ornamental fish, but there are still differences.

Koi are a variety of carp, while goldfish are a variation of crucian carp. Generally, adult koi are much longer and larger than goldfish.