For chronic toxicity testing, D. magna organisms from the same culture as the individuals used for acute toxicity testing were used. The experiment was carried out according to the semi-static test methodology described in the OECD 211 Guidelines (OECD, 2012). The solutions of a selected compound in non-aerated Elendt M4 medium at sub-lethal concentrations (determined based on the results of the acute toxicity test) were placed in 5 glass beakers for each concentration. Pure medium was used for control samples. In the next step, a single female D. magna organism no older than 24 hours was placed in each vessel and the vessels were illuminated with white LED light with the illuminance of 1200 ±600 lx and 16L:8D photoperiod. The range finding experiment was conducted for 21 days. The test medium was renewed 3 times a week, and the organisms were fed living algal cells (C. vulgaris) daily.