mortalityoccurred in each of the three experiments, B,C and F, and two exposure concentrations producedpartial mortalities (i.e. >0 and <100%) in each of thetwo experiments, E and G. Values of zero fish mortalitiesin control beakers occurred in all tests. For thehighest G. corsicum densities tested, fish mortalitiesof 100% were found, except for one test in which a60% mortality was produced at a G. corsicum densityof 2197 cells ml−1 obtained at the end of the bloom.For samples tested immediately after collection, theminimum cell densities producing detectable effectsranged between 732 and 3558 cells ml−1. The lowestNOEC (No Observed Effect Concentration), whichis the highest tested concentration without significanteffect, was 366 cells ml−1. The comparison between
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