Macrobenthos consists of the organisms that live at the bottom of a water column and are visible to the naked eye. In some classification schemes, these organisms are larger than 1 mm; in another, the smallest dimension must be at least 0.5 mm. They include polychaete worms, pelecypods, anthozoans, echinoderms, sponges, ascidians, crustaceans.
In freshwater ecosystems, the benthic macroorganisms provide a good visual indicator of water quality.
- J.S. Link, C.A. Griswold, E.T. Methratta, J. Gunnard, Editors. 2006. Documentation for the Energy Modeling and Analysis eXercise (EMAX). United States Department of Commerce, Northeast Fisheries Science Center. Reference Document 06-15 Chapter 8.
- "Macrobenthos definition". Mondofacto. 09 Oct 1997. Retrieved 2011-01-26.
- "Macrobenthos definition". Science-Dictionary.com. Retrieved 2011-01-26.