BLACK LAKE PRESERVATION SOCIETY
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Identifying the common merganser

Thank You For Your Interest In Helping the BLPS Control Swimmer's Itch In Our Lake


The Common Merganser and Swimmer's Itch on Black Lake

erThe BLPS has engaged Swimmer's Itch Solutions (SI Solutions, LLC) to assist us with reducing the prevalence of swimmer's itch in Black Lake.   Refer to the Swimmer's Itch page to:
  1. learn about the origins of the swimmer's itch parasite,
  2. see the SI Solutions report that implicates the Common Merganser in the cycle that supports the specific parasite that causes most of the swimmer's itch cases in our lake, or
  3. report a case of swimmer's itch on Black Lake

Based on our learnings, the approach that we have selected is to trap broods of the common merganser and relocate them to lakes that don't have the specific snail that is in our lake that completes the cycle that creates our problem.   This approach, while difficult, repetitive, and expensive, is the most effective, safe, and natural way to reduce the problem in our lake without the use of potentially harmful chemicals.

If you are concerned about Swimmer's Itch, you may consider viewing the training session below to learn how to identify the common merganser.  And when you see a brood (a female with her ducklings) you can report it on the Eyes On The Lake survey form and SI Solutions and BLPS team members will be immediately given the information required to trap and relocate the brood.

You may also consider a financial contribution to the BLPS to sustain this method of managing our problem.
Picture
A female or immature Common Merganser
Picture
A male Common Merganser

Merganser Identification Training

View Black Lake Merganser Identification Training

Report Your Sightings

Enter your observation  in the EYES ON THE LAKE data collection web app by clicking on the button below.  Filling out the  form that comes up  will add your finding to our Geospatial Information System (GIS) so it can be seen by SI Solutions and BLPS members using our EYES ON THE LAKE app!  The first step is to choose your location by clicking on the blue pin or dragging it to the correct location.  Click or tap the back arrow in the green banner at the top of the map to continue with the survey.    Choose "Merganser Sighting" as the Feature type at the end of the survey and don't forget to save your observation.  Thank you for reporting imerganser broods on our lake!

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You may also choose to report your findings and your Spotter  activities on our Facebook page found HERE.
Add Your Sighting to Eyes on the Lake

Consider Helping With The Cost to Trap and Relocate

 Each brood that we trap and relocate eases the swimmer's itch problem on Black Lake, but each brood relocation costs about $3,000.  Please consider contributed to our fund to trap and relocate by clickintg HERE or going to the Donations page in the menu.  Once at the Donate page, choose Swimmer's Itch to make your donation.  All lake users thank you for that!!
Copyright © 2025 Black Lake Preservation Society
913 S Saginaw Rd  |  Box 260  |  Midland MI 48642 
email: [email protected]
​Black Lake Preservation Society on Facebook
501(c)3  Public Charity tax-id  81-2288033

  • Home
  • Our Focus
    • Harmful Algea Blooms (HABs)
    • Healthy Septic Systems
    • Invasive Species
    • Self Assessment Survey
    • Swimmer's Itch
    • Lake Level Management
    • Living Shorelines
    • Water Quality Measurement
  • Membership
  • Contact