The mystery of giant sturgeon, weighs a ton

Kaluga sturgeon with scientific name is Huso dauricus, is one of the giant fish species. This is the largest freshwater fish in the world and classified as extremely endangered and nearly extinct because people hunt for eggs.

Chinese Kaluga sturgeon called Yellowfish is a carnivorous fish that acts upstream to lay eggs in the Acipenseridae family of Acipenseriformes.

This fish has a maximum development length of up to 5.6m and weighs an average of 400kg. Even children have weight up to 1 ton when mature.

In our mind, this delicious fish and egg fish weighs only a few kilograms, a lot more than a dozen kilograms. But few would suspect, the Kaluga sturgeon weighs a ton.

This is a special fish, capable of living in many water environments, including fresh, brackish, and salty waters. No matter which country they live in, they still have the habit of reversing the flow of rivers to breed when the season comes.

They are found in the Amur River up to the upper reaches of Argun, Shinka, Okhotsk coastal estuarine waters and the Sea of ​​Japan. But it is found that this fish is still the most numerous coastal rivers of China .

The lifespan of Kaluga sturgeon is remarkable, up to 80 years. They live mainly in aquifers with a depth of 45-50m with a water temperature of 10 to 20 degrees C. Although they have a huge body, this fish is said to be gentle because they do not have teeth and are less harmful. for the same type.

They used a long muzzle to scour the bottom for bait. Their food is small fish and boneless mollusks. The shape of the snout of this fish will be worn, imprisoned and short when they are "old" . In addition to the pointed muzzle you can identify them with a long body, the back is gray-green to black, the belly is white.

Kaluga sturgeon is one of the fish species with late growing age and very long reproductive cycle. About 2 years they have just given birth once, and the more sparse the cycle is, about 3 - 4 years with older ones.

In the first year, their food is invertebrates, and then they turn to fish, for example Oncorhynchus keta. From 4 to 5 years of age, they eat adult fish.

Eggs, meat, and balls of this fish are a specialty dish of humans. Their meat is placed in the daily menu of ancient kings. So this fish has been hunted and hunted by humans for thousands of years. They are at risk of extinction in the natural environment.

Currently, many countries around the world are studying, breeding and preserving this rare and precious fish. However, Kaluga sturgeon species are not adapted to artificial environments, so scientists' efforts have not been achieved.