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Fig. 1. Actual concentrations of 4-tert-octylphenol (4-tOP) in the aquaria during the experiment from 11 October to 15 November. Broken lines indicate nominal water concentrations. To the water was added isopropanol only (control) or 4-tOP dissolved in isopropanol to nominal concentrations of 25 µg l-1 (OP25) or 100 µg l-1 (OP100). Values are means of concentration of each group in 2-3 aquaria ± S.E.M.