DEC Asks for Help Reporting Cladaphora in the Great Lakes

Cladaphora is a type of stringy (filamentous) algae that grows on rocks, wood, logs and other hard underwater surfaces in freshwater ecosystems, including the Great Lakes basin  If you spot this time of stringy algae along New York’s Great Lakes beaches and shorelines, including Lake Erie, Lake Ontario, the Niagara River or the St. Lawrence River, DEC wants to know.  Please use this fillable PDF to make your report and email the form to

The information collected will assist with efforts in the U.S. and Canada under the Great Lakes Water Quality Agreement that aim to provide a better understanding of where, when, and the extent to which Cladaphora is accumulating along the Great Lakes shorelines.


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