Channel catfish are a favorite catch in the Minnesota River.

Iowa Catfish

In 1985, the Minnesota Department of Health based its advice on eating catfish from the Minnesota River on PCB levels. PCBs are industrial compounds that were widely used for their insulation properties until banned in 1976. Concentrations of PCBs in catfish have declined since then, but still pose a threat to those who consume them. Too much exposure to PCBs can cause developmental delays in children or cancer. The Department of Health allowed unlimited consumption of catfish above Granite Falls, MN. But anglers below Granite Falls were advised to eat only one meal of catfish per month or none at all depending on the size of the fish.