Abstract
The growth of eight planktonic algae was compared in filter or heat-sterilized sea water. The diatoms were inhibited by unheated sea water, with a typical increase of generation time, and a decrease of biomass and chlorophyll synthesis of the cultures. Such inhibition, changing with time and disappearing at 120°C, was removed by treatment of sea water by two adsorbant powders, celite and Fullers's earth. This natural inhibition of diatoms in raw sea water could be due to the presence of thermolabile ectocrines. The aquacultural and ecological involvements of these observations are discussed.
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