
The Florida Fish and Wildlife Conservation Commission has received reports of thousands of dead fish — catfish, bream, black bass, a large mouth bass, shad, bluegill, eel, snook, a stingray, brim, red drum, gar, redfish and mullet — in the St. Johns River and its tributaries in the past week.
Dead fish have been reported along an 85-mile length of the river from Lake George north to Naval Air Station Jacksonville.
Although tests to determine the cause of the kill aren’t complete, FWC scientists suspect an early outbreak of toxic blue-green algae.
Algae blooms are common in the St. Johns River during the summer, But just because the blooms are routine doesn’t mean they’re part of a healthy river’s natural purging.
The electric green blooms are fed by excessive nitrogen and phosphorous washing into the river and feeding its phytoplankton until they grow into oxygen-hogging and light-blocking mass. The overload of nutrients come from fertilizers used to keep lawns a pristine green and fertilizers pumped to feed the growth of farm crops, as well as from simple things like dog poop left on the ground that washes into storm drains and then into the river along with oil washed from roads. One of the biggest contributers to nutrient overload is the effluent dumped into the river from manufacturers such as paper mills and from breaks in the sewage system.
Anyone who sees a dead fish should report it to the FWC hotline at 800-636-0511.
— Susan Eastman