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MANAGEMENT

Can aggressive harvest actually control invasive flatheads?

Models and real removal programs agree on one point: directed harvest can work, but pressure must be substantial and sustained.

>25%ANNUAL FISHING MORTALITY ASSOCIATED WITH SIGNIFICANT DECLINES IN SATILLA MODELS

The management question is not whether a few more fish can be removed. It is whether harvest tools can produce enough continuing mortality to reduce population size and protect native communities.

01

Evidence that removal works

The USGS-supported community model found that sustained exploitation at rates comparable to native flathead fisheries—6% to 25% annually—could mitigate modeled native-fish losses. Georgia's field program produced steep declines in average flathead size and biomass per unit effort.

  • Directed harvest can be part of a native-fish recovery strategy.
  • High early removal does not eliminate the need for maintenance.
  • Monitoring is necessary to determine whether management targets are being met.
02

Why recreational anglers matter

Agency electrofishing is effective but requires staff, equipment, and recurring public funds. Recreational anglers can add removal pressure at their own expense when regulations give them effective, carefully controlled methods.

03

A sportfish and an invader

Flatheads are valued sportfish and food fish in their native range and in many introduced fisheries. Management can recognize that value while prioritizing removal in a watershed where they are nonnative and native fish have declined following establishment.

SOURCES

CHECK THE RECORD.

01
Modeling management scenarios and an introduced apex predatorUSGS Publications Warehouse
02
Satilla River Flathead Catfish Removal ProjectGeorgia Department of Natural Resources
03
Comparison of native and introduced flathead populationsUSGS Publications Warehouse