Harmful Algal Bloom Warning Muskegon Lake
The City of Muskegon was notified on 8/6/24 by Muskegon County Public Health to post warnings for Harmful Algal Blooms on Muskegon Lake. Read the communication from the county here.
In summary, in early July, the county took samples from an algae bloom on Muskegon Lake. The state lab in Lansing tested the sample and determined it to be harmful. A lot of time has passed since that bloom was sampled. However, GVSU has done additional testing on Muskegon Lake and has found evidence of a continuing bloom in some areas. The warning signs are just that, a warning to look for algae blooms. They do not confirm the presence of a Harmful Algae Bloom in all the locations where the signs are posted, but it does advise those entering Muskegon Lake to be cautious and take steps to reduce potential exposure to themselves, their families, and their pets.
What are Algal Blooms
Algae blooms can often have a distinct smell, described as earthy, musty, swampy, or even foul. These odors are often associated with the breakdown of algal cells and the release of gases like hydrogen sulfide or geosmin. Some types of algae, like Lyngbya, can have a dirty, fishy smell, while others, like Chara, can produce a skunky or sulfur-like odor.
1. Hydrogen Sulfide:
Harmful algal blooms (HABs) can release hydrogen sulfide as they decay.
Hydrogen sulfide is a naturally occurring, colorless gas with a foul odor, often described as smelling like rotten eggs.
The human nose is very sensitive to hydrogen sulfide and can detect it at very low levels.
2. Geosmin:
Some blue-green algae (cyanobacteria) produce an odor-generating byproduct called geosmin.
Geosmin is a naturally occurring compound that can cause a musty or earthy taste and odor in water.
The human nose is highly sensitive to geosmin.
3. Other Algae-Related Smells:
Different types of algae can produce various odors.
For example, Lyngbya can have a dirty, fishy smell, while Chara can smell skunky or sulfurous.
Some algal blooms can also have a swampy or foul odor.
4. Identification:
If you notice a distinct, foul smell near a body of water, especially if it’s accompanied by discolored water, foam, or scum, it could be an algal bloom.
It’s important to be aware of these signs and follow any local advisories about swimming, fishing, or shellfish harvesting in the affected area.