4.08.11.Vavozh. Udmurtia. Vavozhskaya fish die due to elevated nitrite in water.
According to the press service of the State Veterinary Udmurt Republic, the facts of mass death of fish were found in the rivers of Uva and Vala July 29 of this year.
Water sample and dead fish showed maximum permissible dose of nitrite — almost 5 times, ammonium ions — 2 times. That is what caused the death of fish. By the fact of review.