Abstract

The study shows that the NH3 content in surface waters at pH 6.5–7.0 does not exceed the mandatory value for salmon and cyprinid waters of <= 0.025 mg/dm3. At pH 7,5 (15-200C, class IV) to pH 9,0 (5-200C, class I-IV) the value is exceeded 1.1-44.5 times. In the Protocol on Water and Health in the Republic of Moldova for the years 2016-2025, point 123, it is mentioned that there is a lack of monitoring on the quality of water for fish farming in artificial ponds. Thus, it is proposed to include NH3 in the surface water quality monitoring program, in particular to reduce the risk of toxicity to aquatic biota, protect or improve the maintenance of fish life.

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