The Satilla is a Southeastern coastal-plain river with an exceptionally well-documented management response. It is not the Choctawhatchee, but it is a warning about the scale and duration of control after an introduced population becomes established.
From introduction to full-time control
Flatheads were confirmed in the Satilla in 1996. Georgia documented declines in redbreast sunfish, channel catfish, native bullheads, and angler success. Limited removal was not enough, and in 2006 the state funded three dedicated positions. Full-time removal began in 2007.
- More than 4,000 flatheads were removed in the first intensive year.
- More than 64,000 were removed in the first ten years.
- More than 100,000 had been removed by 2023.
The population changed
Average fish weight fell from 5.8 pounds in 2007 to 0.8 pound in 2018. Biomass captured per hour fell from 57.1 kg/hour to 11.4 kg/hour—about an 80% reduction.
- 2007 tagging estimated a 40–52% population reduction.
- About half of tagged fish were recaptured and removed in both 2007 and 2008.
- Modeling indicated significant declines above roughly 25% annual fishing mortality.
Control is not a one-time event
Georgia concluded that maintenance control appears possible only if intense harvest continues. Biologists also observed reproductively mature females at unusually small sizes, including a 7.5-inch gravid female, which may represent a compensatory response to heavy removal.