Adirondack Brook Trout Populations Bounce Back

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Native brook trout, the official state fish of New York, are making a comeback in Adirondack streams that were once thought to be dead due to acid rain. A federal study found that the fish repopulated 33 of the 42 streams examined, confirming that regulations can reverse the damage caused by air pollution to freshwater ecosystems. The New York State Department of Environmental Conservation has finalized a 15-year "Adirondack Brook Trout Pond Management Plan" to protect wild populations, prioritize self-sustaining fish over stocked hatchery trout, and ban using live baitfish in most Adirondack Park waters.

Why it matters

The recovery of native brook trout in the Adirondacks is a significant environmental success story, demonstrating that regulations can effectively reverse the damage caused by air pollution and acid rain to sensitive freshwater ecosystems. This comeback also has important implications for the region's ecology, economy, and recreational activities.

The details

The U.S. Geological Survey examined 42 streams across the Adirondack Park and found that brook trout repopulated 33 of the sites. During the acid rain heyday of 1984 to 1989, less than half were populated. The return of the brook trout is attributed to a 94% drop in nationwide emissions of sulfur dioxide, the main cause of acid rain, from 1990 to 2021 due to the national Acid Rain Program.

• The USGS report was published in the journal 'Freshwater Science' in December 2026.
• The New York State Department of Environmental Conservation finalized the 15-year 'Adirondack Brook Trout Pond Management Plan' on January 5, 2026.

What they’re saying

What’s next

The DEC is partnering with groups like Trout Unlimited and SUNY College of Environmental Science and Forestry to expand monitoring initiatives and recruit a brook trout surveillance team of volunteer anglers to help track the genetic health of the fish and monitor for invasive species.