Note
The red alga Gracilaria tikvahiae may be grownoutdoors year-round in central Florida with yieldsaveraging 35.5 g dry wt/m² . day, greater than themost productive terrestrial plants. This occurs whenthe plants are grown in suspended culture, with vigorousaeration and an exchange of 25 or more culturevolumes of enriched seawater per day. A culture systemwas designed in which Gracilaria, stocked at adensity of 2 kg wet wt/m², grows to double its biomassin one to two weeks; it is then harvested to its startingdensity, and anaerobically digested to methane.