Madison Lakes See Steep Decline in Perch Population

Invasive species like zebra mussels and spiny water fleas blamed for plummeting catch rates

Published on Feb. 21, 2026

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The perch population in Madison, Wisconsin's lakes has seen a dramatic decline in recent years, impacting both the local ecosystem and businesses that rely on anglers. Data from the Wisconsin Department of Natural Resources shows catch rates have fallen from 61 fish per net-night in 2020 to a record low of 14.4 in 2024. Bait shop owner Pat Hasburgh has witnessed the changes firsthand, recounting a time when the lakes were renowned for their perch fishing.

Why it matters

The decline in perch is raising concerns about the long-term health of the fishery and the broader ecological balance of the lakes. The presence of invasive species like zebra mussels and spiny water fleas are disrupting the food chain and impacting the availability of sustenance for young perch, leading to the population crash.

The details

Hasburgh points to the presence of zebra mussels and spiny water fleas as contributing factors to the decline. These invasive species disrupt the food chain, impacting the availability of sustenance for young perch. The spiny water flea, which became established in Lake Mendota in 2009, is a particular concern as it is an invasive species of zooplankton that impacts the food supply for young perch.

  • In 2020, the catch rate was 61 fish per net-night.
  • By 2024, the catch rate had plummeted to a record low of 14.4 fish per net-night.

The players

Pat Hasburgh

The owner of D&S Bait Tackle and Fly Shop in Madison, Wisconsin, who has witnessed the changes in the perch population firsthand over the past 25 years.

Wisconsin Department of Natural Resources

The state agency that has confirmed the dramatic decline in perch population through its data collection and monitoring efforts.

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What they’re saying

“When I first started perch fishing here in town, 25 years ago, the perch population was crazy. I heard stories about lines all the way to the back of the shop, with people streaming in trying to get in on the good perch bite.”

— Pat Hasburgh, Owner, D&S Bait Tackle and Fly Shop

“It's just been on a slow decline, and this year is the worst we've ever seen.”

— Pat Hasburgh, Owner, D&S Bait Tackle and Fly Shop

What’s next

The Wisconsin Department of Natural Resources plans to continue monitoring the perch population and explore potential management strategies to help restore the fishery to its former abundance.

The takeaway

The decline in Madison's perch population highlights the significant impact invasive species can have on local ecosystems and the businesses that depend on them. Ongoing monitoring and potential management interventions will be crucial in determining the future of perch fishing in the region.