The sweltering heat in St. Petersburg threatened to destroy the ecosystem of the reservoirs of the Russian city. A further rise in water temperature may be detrimental to fish in the Neva and other rivers, Rosprirodnadzor reports.

Ecologists emphasize that the July weather anomalies lead not only to an active bloom of blue-green algae in water bodies, but also to a decrease in the oxygen level in them. In the Neva, the average water temperature in summer is usually about 20 degrees Celsius, judging by measurements at noon on July 14, the river has already warmed up to 25.1 degrees. If the abnormal heat drags on, then a massive “fish kill” may begin, the department explains. Perch, pike perch, pike, bream and other types of fish are found in the rivers and reservoirs of the city.

As of mid-July, in many water bodies of St. Petersburg, due to the high temperature, the content of dissolved oxygen dropped to one milligram per liter or less. “The normal oxygen content per liter of water is 5-7 milligrams. The lower limit of the oxygen content, at which the fish begins to die, is on average 0.3-0.5 milligrams per liter, “the inspectors of Rosprirodnadzor add.

The intense heat forced the swifts to leave Moscow. The birds suffered from the lack of food, as the number of insects they feed on decreased after the sharp rise in temperatures. Environmentalists associate weather anomalies with global warming, the seriousness of which the inhabitants of most countries of the world refuse to recognize.

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