Deadly Parasite Found in Northern Wisconsin Trout Streams

by Daniel Garduno, age 12

In northern Wisconsin streams, where salmon and trout abound, there is a new and dangerous parasite. Myxobolus cerebralis can be harmful to these fish and perhaps more. The appearance of this parasite has led to new research in Wisconsin.

Myxobolus is an organism found in trout and salmon, is a parasite that is capable of damaging the cartilage and the nervous system of the fish. This results in fish swimming aimlessly around lakes, streams, and rivers. Fish with the parasite have difficulty feeding or avoiding predators. Usually this makes them easy prey, giving them an even lower chance of survival.

The Wisconsin Department of Natural Resources (DNR) recommends that fishermen clean their fishing gear, equipment, and boats when leaving one body of water for another. They renewed these guidelines after the parasite was discovered in northern Wisconsin’s Elton Creek.

Not only can this parasite cause confusion for the fish, but it can also damage parts of its body. Examples include twisted spine or a deformed head which can result in disease and death. Damaged cartilage and nervous systems can also result from the Myxobolus parasite. Scientists believe Myxobolus can't harm humans.

The Wisconsin DNR issued warnings in early 2024. Fishermen should be cautious with their fishing gear until further updates regarding the parasite are reported.

[Sources: Milwaukee Journal-Sentinel; Wisconsin State Journal]