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![Most algae need a hard substrate upon which to anchor with their holdfast expl1897.jpg Most algae need a hard substrate upon which to anchor with their holdfast](/sites/default/files/styles/max_1300x1300/https/s3.amazonaws.com/s3-east-testmedia-noaa.woc.noaa.gov/dam/Photos/legacy/pl23_expl1897.jpg?itok=9nGUfgWc)
Description
Most algae need a hard substrate upon which to anchor with their holdfast. Insilty mud bottoms they must compete for space on available shell debris withother organisms , as shown here by the red alga Graciliara blodgettii at 100meters depth on McGrail Bank. (Image credit: Gulf of Mexico Deep Sea Habitats Expedition/NOAA/OAR/OER; FGBNMS/UNCW-NURC)