Note
Two species of macroscopic marine algae (Rhodophyceae) were grown and harvested continuously during 1974 in Fort Pierce, Florida. The seaweeds Gracilaria sp. and Hypnea musciformis were grown in both 600-l and 350-l tanks in the third stage of a nutrient removalaquaculture process that included microscopic marine algae and oysters in the first two stages. Mixtures of secondary-treated waste water and sea water constituted the initial nutrient source, with the seaweeds utilizing nutrients not assimilated by the microscopic algae and/or generated by the oysters. Standing crops of up to 7 900 g wet weight of Hypnea and 9 000 g Gracilaria were maintained.