Update: 2022 Spiny Waterflea Findings in Lake Winnebago

Additional Monitoring Reveals No Other Spiny Waterfleas

Following up from a spiny water flea finding in Lake Winnebago in 2022, the WI Department of Natural Resources and local partners conducted extensive monitoring for spiny water fleas through the summer and fall of 2022. Biologists were searching for additional adult spiny waterfleas as well as eggs that would have been laid in the sediment of the lake. Following analysis of the samples collected, we are please to report that no evidence of spiny waterflea were found which includes not finding any eggs!

This is fantastic news for our waterways! Currently, there is no evidence that the spiny waterfleas found in 2022 were able to establish a population in Lake Winnebago. Ongoing monitoring by UW-Green Bay as part of the Fox River Navigational System Authority (FRNSA) AIS Monitoring Program will continue to keep an eye out for spiny waterflea and other invasive species.

Remember- an ounce of prevention is worth a pound of cure. It’s easy to help prevent the spread of all aquatic invasive species between lakes. No matter what lake or river you visit, follow these steps to protect your wild places:

Spiny waterflea on a fingertip

· Inspect equipment (boats, fishing line, etc.) for attached aquatic plant, animals, or mud

· Remove all attached plants or animals

· Drain all water from buckets and containers

· Never move live fish away from a waterbody (fish out of water = dead)