In 2011, USGS researchers began studying Lake Erie's fish and seasonal hypoxia across a multi-year project. 15 years later, the findings showed fish crowding areas near 2–3 mg/L oxygen, revealing an unexpected shift at the edges of low-oxygen zones

Lake Eries seasonal hypoxia is changing where fish gather. For years, scientists watched oxygen levels fall and fish move around the lake. Then came a surprising pattern. Fish were not simply escaping low-oxygen water. Many crowded near the edges of these “dead zones,” where oxygen hovered around 2–3 mg/L. The finding offers a new look at Lake Eries underwater ecosystem.

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