A harmful algal bloom (HAB) is an algal bloom that can be dangerous to people, animals or the ecology.
Some, but not all, HABs produce chemicals that can be toxic to humans and animals if ingested, inhaled, or if contacted by skin or mucous membranes.
These toxins can also accumulate in fish and shellfish which can cause illness when either are consumed.
HABs can occur in both the freshwater and marine water environments. For additional information on freshwater cyanobacterial HABs, please visit https://www.state.nj.us/dep/wms/bfbm/CyanoHABHome.html. For additional information on marine water-related HABs, please visit https://www.state.nj.us/dep/wms/bmw/phytoplankton.htm.