The aim of the present study was to determine lethal concentrations LC50 of dibutyl phthalate (DBP) and benzyl butyl phthalate (BBP) for European pikeperch, Sander lucioperca (L.). The tests were conducted in a static system, using the following nominal concentrations of phthalates: 0.0; 2.09; 4.18; 6.28; 8.37; 10.46 mg DBP dm-3 and 0.0; 0.55; 0.99; 1.54; 2.09; 2.64 mg BBP dm-3. The mean lethal concentration of DBP estimated in a 96-hour acute test (96h LC50) was 6.56 mg dm-3. However, BBP at its aqueous solubility limit of 2.64 mg dm-3 did not have a negative impact on the fish. Pikeperch was more tolerant of both phthalates in comparison to yellow perch, Perea flavescens (Mitch.), fathead minnow, Pimephales promelas (Raf.), or channel catfish, Ictalurus punctatus (Raf.). The sensitivity of pikeperch to phthalates is similar to that of rainbow trout, Oncorhynchus mykiss (Walb.).
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