Whitefish Recovery in Green Bay: A Cautionary Tale for Michigan

In recent years, southern Green Bay has experienced a remarkable resurgence of whitefish, a species that has largely vanished from the lower Great Lakes. Once deemed too polluted to support significant fish populations, the bay has transformed into a vital habitat, yielding substantial catches for both commercial and recreational fishers. Bruce Smith, an avid ice fisherman, describes the area as “Whitefish Town, USA,” highlighting the unexpected boom in whitefish numbers despite broader declines in Lake Michigan. This phenomenon has prompted scientists to investigate the unique conditions that have allowed whitefish to thrive in Green Bay, offering potential lessons for Michigan's struggling fisheries.

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The revival of whitefish in Green Bay can be traced back to significant environmental improvements following the Clean Water Act of 1972. Prior to this, industrial pollution, particularly from paper mills, severely degraded water quality. The introduction of invasive zebra and quagga mussels further complicated the ecosystem, monopolizing nutrients essential for fish survival. However, a concerted restoration effort has led to cleaner waters, with phosphorus levels near the river mouth decreasing by a third over 40 years. This has allowed whitefish populations to rebound, with commercial catches in Green Bay increasing dramatically from less than 100,000 pounds in 2000 to over 800,000 pounds in 2024.

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The resurgence of whitefish has not only benefited the ecosystem but has also revitalized local economies. Recreational ice fishing has become increasingly popular, contributing tens of millions of dollars to the local economy. In contrast, Michigan's commercial harvests from Lake Michigan have plummeted by 70% since 2009, with Green Bay now accounting for more than half of the state's catch. The nutrient-rich waters of Green Bay have created a unique fishing environment, prompting discussions about whether similar strategies could be applied in Michigan to bolster its declining whitefish populations.

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Despite the current success, scientists express concern over the sustainability of the whitefish population in Green Bay. Recent models indicate a troubling decline in juvenile fish, raising alarms about the long-term viability of the population. Factors such as climate change and fluctuating ice conditions pose additional threats, as whitefish require stable ice cover for spawning. Experts like Scott Hansen from the Wisconsin Department of Natural Resources advocate for closer monitoring of the population and potential adjustments to fishing quotas to ensure the species' survival.

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While some stakeholders, including commercial fishing board chair Todd Stuth, resist immediate quota reductions, they acknowledge the need for vigilance. Stuth emphasizes the importance of a conservative approach, stating, “A very conservative approach is going to be necessary. Because it’s our last stronghold.” Conversely, fishing guide JJ Malvitz argues for collective action among anglers to reduce harvest limits, fearing that without proactive measures, the whitefish population could face another decline.

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The story of whitefish in Green Bay serves as both a success and a warning. As the population flourishes, the potential for rapid decline remains a pressing concern. Stakeholders must navigate the delicate balance between economic interests and ecological sustainability to protect this vital resource for future generations.

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