Microalgae Pseudo-nitzschia multiseries (Hasle) Hasle and Pseudo-nitzschia calliantha Lundholm, Moestrup et Hasle (Bacillariophyta) growth under surface active substance sodium dodecylsulfate (SDS) influence was studied. P. multiseries growth was stimulated in concentration 0.05 mg/litter SDS; P. calliantha growth didn’t considerably differ from control in such conditions. Addition of toxicant in 0.1 and 1 mg/L result in cells number decreasing of two microalgae. In SDS concentration 0.05–1 mg/L amount cells in chains didn’t differ from control. Substance addition in 10 mg/L inhibited microalgae growth and number of cells didn’t exceed 55% of control even at the end of experiment. P. multiseries chains became shorter, P. calliantha chains didn’t change.

Keywords: Pseudo-nitzschia multiseries, Pseudo-nitzschia calliantha, growth, sodium dodecylsulfate, surface active substances

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