AIS Early Detection & Water Quality Monitoring Reports

AIS Early Detection and Water Quality Monitoring 


The Oneida County AIS Program, in collaboration with the Citizen Lakes Monitoring Network and the WI Department of Natural Resources, monitors a minimum of 15 Oneida County lakes each year, for the presence of AIS and water quality.

Why is monitoring important? Because early detection of AIS is crucial for rapid response, containment, and management. Water quality monitoring  estimates lake health, and it plays an important role in determining the types of plants and animals that a waterbody can support.

The AIS and water quality data collected by the Oneida County AIS Team is uploaded to the Oneida County AIS and Water Quality Mapping Tool. Through this mapping tool, you can search the geographical distribution of AIS, learn about your lake and share your knowledge and information you gather with your lake association and other lake residents.

In addition to the Mapping Tool, our AIS Team completes a written report for each lake they have monitored. Click on the links below to find your lakes report.  If you would like us to visit your lake, please call Stephanie Boismenue at 715-369-7835 or email

Oneida County AIS Special Monitoring Report:
​Yellow Iris Survey on the Three Lakes Chain.

On the morning of June 25, 2019, Oneida County AIS Coordinator Stephanie Boismenue, joined Jay Teagle, Volunteer Lake Captain with the Three Lakes Waterfront Association, on his pontoon to search the Three Lakes Chain for the invasive Yellow Iris.  The crew surveyed Deer Lake, Dog Lake, and Big Lake and found the pretty invasive plant growing in 20 different sites – littorally!   See below for survey results and recommendations presented to the Three Lakes Waterfront Association during their annual meeting on July 3, 2019.


Minimum dissolved oxygen requirements of freshwater fish

Coldwater fish like trout and salmon are most affected by low dissolved oxygen levels. The mean DO level for adult salmonids is 6.5 mg/L, and the minimum is 4 mg/L. These fish generally attempt to avoid areas where dissolved oxygen is less than 5 mg/L and will begin to die if exposed to DO levels less than 3 mg/L for more than a couple days. For salmon and trout eggs, dissolved oxygen levels below 11 mg/L will delay their hatching, and below 8 mg/L will impair their growth and lower their survival rates.  When dissolved oxygen falls below 6 mg/L (considered normal for most other fish), the vast majority of trout and salmon eggs will die.
Bluegill, Largemouth Bass, White Perch, and Yellow Perch are considered warm water fish and depend on dissolved oxygen levels above 5 mg/L21. They will avoid areas where DO levels are below 3 mg/L, but generally do not begin to suffer fatalities due to oxygen depletion until levels fall below 2 mg/L 22. The mean DO levels should remain near 5.5 mg/L for optimum growth and survival.
Walleye also prefer levels over 5 mg/L, though they can survive at 2 mg/L DO levels for a short time.
Muskie need levels over 3 mg/L for both adults and eggs. Carp are hardier, and while they can enjoy dissolved oxygen levels above 5 mg/L, they easily tolerate levels below 2 mg/L and can survive at levels below 1 mg/L.
The freshwater fish most tolerant to DO levels include fathead minnows and northern pike.
Northern pike can survive at dissolved oxygen concentrations as low as 0.1 mg/L for several days, and at 1.5 mg/L for an infinite amount of time. Fathead minnows can survive at 1 mg/L for an extended period with only minimal effects on reproduction and growth.
As for bottom-dwelling microbes, DO changes don’t bother them much. If all the oxygen at their water level gets used up, bacteria will start using nitrate to decompose organic matter, a process known as denitrification. If all of the nitrogen is spent, they will begin reducing sulfate. If organic matter accumulates faster than it decomposes, the sediment at the bottom of a lake becomes enriched by the organic material.