The population of large freshwater species has declined by as much as 97 percent since 1970.

Illustration, Photo: Pixabay

The population of large freshwater species, from catfish to rye, has decreased by 97 percent since 1970, the Guardian writes today.

The population of large species that once dominated the world’s rivers and lakes has been drastically reduced in the last 50 years, the results of the latest study are.

Some species of freshwater megafauna have already been declared extinct, such as the Yangtze River dolphin, and many others are on the verge of extinction, from giant catfish from the Mekong, rye and Indian crocodiles to European sturgeon, according to a report in the journal Biology of Global Change ”.

Only three large Chinese soft-armored turtles are alive today and they are all males.

Across Europe, North Africa and Asia, the population of freshwater species has declined by 97 percent since 1970. The most common cause of population decline is the killing of animals for meat, skin and eggs, as well as man’s thirst for drinking water for crops, numerous dams, but also increasing pollution.

According to scientists, the population of 126 species in 72 countries has decreased by 88 percent.

Many of these species represent an essential species in their ecosystems, such as beavers, and scientists say that their loss will affect the flora and fauna and millions of people who are vitally dependent on watercourses.

Scientists say that the giant catfish, weighing about 300 kilograms, carp and rye, for which the Mekong River in Southeast Asia is known, are on the verge of extinction. However, other species are also disappearing around the world.

“Once a widespread European sturgeon, it has practically disappeared in all major European rivers, except in the Garonne River in France,” the research states.

The population of the Eurasian beaver, which is essential for nature and habitats, has almost halved, although this species has been returned to Britain, the Czech Republic, Estonia, Finland and other places, the paper writes.