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A series of water samples from Lake Kinneret was supplemented with 100 mu M N (as NH sub(4) or as NO sub(3)) and/or 10 mu M orthophosphate-P. The yield of phytoplankton both as chlorophyll and in cell numbers of major species was determined after a two-week incubation. During these experiments, some of the algae present initially never multiplied (e.g. Peridinium) and Peridiniopsis spp., Cryptomonas spp., Rhodomonas spp. and Crysochromulina parva ); others e.g. Anomoeoneis exilis, Synedra sp., Chlamydomonas sp., Elakatothrix gelatinosa ), undetected in the original sample, grew out during the incubation. Chlorophyte species (the majority of commonly observed forms in the lake) responded most readily to added nutrients.