The Kansas Department of Health and Environment has issued its annual advisory that “bottom-feeding” fish taken from the Kansas River between Lawrence and Eudora should not be eaten.

The river in the Lawrence area still has high PCB levels, KDHE officials say. PCBs are toxic chemicals that were outlawed in the 1970s, but traces still remain. PCBs degrade slowly, but levels are expected to go down, officials said.

Bottom-feeding fish include carp, blue catfish, channel catfish, flathead catfish, freshwater drum, bullheads, sturgeons, buffalos, carpsuckers and other sucker species.