Macroalgae in Estuaries by Betty Staugler Posted: September 10, 2020 2 Comments Macroalgae are large species of algae often referred to as seaweeds. When not attached to bottom sediments, they are commonly called drift algae. Macroalgae come in colors of red, green, brown and black, and they… Read More Category: Coasts & Marine, Natural Resources, UF/IFAS Extension, Water Tags: algae, drift algae, Florida Sea Grant, nutrients, seaweed, water quality