PURPOSE: To culture algae and more particularly Chondrus crispus at a high yield by arranging obstacles on the course of a liquid medium driven by the impellers of an alga culture tank. CONSTITUTION: The culture tank 10 which has a somewhat flat elliptic annular form delineated between an outside wall 11 and a central nucleus 12 and includes at least one of the radial impellers 14 and discharge pipes 22 consist of at least two groups of the obstacles 18, 20. The one 20 is arranged on the axis of the central nucleus 12 and another 18 is arranged downstream of the impellers 14. The obstacle 18 has an angle of 90 to 160 deg. with the flow and the length thereof, if longest, is equal to half the width of the fluid flow. The sea water is supplied to this culture tank 10 which is then replenished with a carbon source, nitrogen source and phosphorus source. The pH of the medium is maintained at 8 to 9. The pH of the medium is maintained at 8.5 to 8.8 by adding an inorg. acid to the tank in some cases during long-term photosynthesis.
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