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Kirsti Marohn and Paul Middlestaedt
Lake Mille Lacs

Photos: Listening for clues to Mille Lacs walleye decline

Researchers want to test a hypothesis that invasive species impact walleye.
The Mille Lacs Band of Ojibwe received a nearly $200,000 grant from the U.S. Fish and Wildlife Service to use acoustic telemetry technology to study the walleye population on the popular central Minnesota lake. They launched from Shah-bush-kung Bay public access in Vineland, Minn., on July 13, 2018.
Paul Middlestaedt for MPR News

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What's causing the Lake Mille Lacs walleye to disappear?

Researchers from the Mille Lacs Band of Ojibwe and the Great Lakes Indian Fish & Wildlife Commission have launched a new study to try to find out. The scientists want to test their hypothesis that the lake 's warmer lake temperatures and increased water clarity due to invasive species are crowding walleye into smaller areas of the lake, resulting in bigger walleye eating smaller ones.

Concern over the health of the lake's walleye population has led state officials to impose stricter angling limits on the popular destination lake. Walleye fishing is catch-and-release only for the third consecutive season this year.

Gallery
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Fish are released back into the lake where their behavior will be tracked.
Along with the fish's location, researchers can track the depth and temperature of the water where they spend time throughout the year.
Paul Middlestaedt for MPR News
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Researchers want to test a hypothesis that invasive species impact walleye.
The Mille Lacs Band of Ojibwe received a nearly $200,000 grant from the U.S. Fish and Wildlife Service to use acoustic telemetry technology to study the walleye population on the popular central Minnesota lake. They launched from Shah-bush-kung Bay public access in Vineland, Minn., on July 13, 2018.
Paul Middlestaedt for MPR News
2 of 10
A small transmitter inserted into the walleye will send data to receivers.
A small transmitter inserted into the walleye will send data to receivers that were placed throughout the lake in a grid pattern.
Paul Middlestaedt for MPR News