Definition and Importance:
Fleshy macroalgae are large, leafy algae that can grow on reefs. High levels of fleshy macroalgae cover indicate an imbalance in the reef ecosystem. They compete with corals for space and light and can inhibit coral recruitment and growth, often proliferating when there is overfishing of herbivorous fish and/or nutrient pollution from land runoff, improper sewage treatment, etc.

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How Do We Measure it?
Fleshy macroalgae cover is also assessed using the point intercept transect method under the Atlantic and Gulf Rapid Reef Assessment AGRRA protocol. Divers record all the types of substrate present at regular intervals along a transect line. When the intersection points show fleshy macroalgae, these are counted, and the total is used to calculate the percentage of the transect covered by macroalgae. This method allows for a standardized comparison of macroalgae cover across different reef locations, highlighting areas where macroalgae may be outcompeting coral.