Canal algae - or what is it?

Asked September 18, 2018, 7:22 PM EDT

We found this stuff floating in a canal we live on off of Houghton Lake (Michigan). We have not noticed it in prior years. What is it and is it harmful?

Roscommon County Michigan

2 Responses

Thank you for your question. I am sorry for the delay. It appears to be algae, a problem occuring in many waterways. Here is an article about it: You might like to contact your county Extension office directly for more assistance: Good luck!

The algae appears to be a filamentous algae. Filamentous algae are a normal occurrence in lakes in Michigan and provide a valuable food source for a variety of lake organisms. If they grow to nuisance levels, that may be a sign of an over abundance of the nutrients nitrogen and phosphorus in the water. Here is a factsheet from Penn State on filamentous algae