Hydrochemistry of limnic reservoirs and biological characteristics of common roach Rutilus rutilus (Cyprinidae, Actinopterygii)

Peculiarities of the hydrochemical conditions in the Ivankovskoye, Shushpanskoye, Chelnavskoye, Matyrskoye, Starooskolskoye, Belgorodskoye reservoirs and the biological status of common roach according to our data collected from May to October, 2010–2022, are shown. The study notes that short-term excesses of the limit concentrations of the regulatory values (O₂, pH, nitrates, ammonia, total iron and phosphates) are not critical for roach growth. E.g., the organic pollution (BOD₅) characteristic in the Belgorod reservoir exceeded the norm 4 times. The optimum situation for roach life activity was observed in the Shushpanskoye reservoir, where males reach the largest size of 25.1±0.6 cm and 224.0±17.1 g, females 23.6±0.6 cm and 226.8±11.6 g, respectively. Common roach is able to tolerate short-term excesses of BOD₅, so roach growth was similar to the average in almost all limnic reservoirs when BOD₅ changed from 1.5±0.2 to 3.4±0.7 mgO₂/dm³ . Exceeding BOD₅ by a factor of 4 inhibited the size and weight growth of males and females by a factor of 1.4 on average.

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