The Maryland Department of the Environment says it is aware of reports of a fish kill in the Potomac River near Seneca.
According to a social media post by the agency on Saturday night, a biologist recorded a water temperature of 94°F, the highest on record at the location.
Officials say the extreme heat can trigger a summer turnover event, which occurs when warm and cold layers of water suddenly mix. During this process, oxygen-poor water from deeper in the river rises to the surface, reducing oxygen levels and placing significant stress on fish.
The department did not indicate how many fish were affected and has not announced any additional concerns at this time. Officials continue to monitor the situation.
“We’re aware of reports of a fish kill in the Potomac River near Seneca. Our biologist recorded water temperatures at a record 94°F. This can trigger a summer turnover event, when layered warm and cold water suddenly mix and oxygen-poor water rises to the surface, stressing fish.”
