Water Quality Assessment in the Vicinity of Trout Farming at Lake Kholmovskoye, Primorsky District, Arkhangelsk Region

This study presents hydrochemical assessments conducted in the vicinity of a trout farm in Lake Kholmovskoye during the summer of 2022 and winter of 2023. Parameters including pH, mineralization, dissolved oxygen, and nutrient levels were analyzed. The compliance of these parameters with regulatory standards for water quality in fisheries was evaluated. Based on its chemical composition, Lake Kholmovskoye is classified as a low-mineralized, hydrocarbonate-type lake (131 mg/L) with a slightly alkaline pH range of 7.9–8.3. Observations indicated that concentrations of phosphorus, nitrogen, and silicon salts in both summer and winter did not exceed permissible limits for fisheries. Dissolved oxygen levels were within acceptable ranges for aquatic life during both periods of the study.