"African cichlids are the worst," said David Ceilley, a senior ecologist for Johnson Engineering. "They're having a terribly negative impact. The biomass of jewel cichlids is massive.

However, the jewel cichlid which has a large swim bladder but no connection to the inner ear is also able to detect frequencies up to 3 kHz but only at higher sound levels.

David Ceilley and his son Connor weren’t surprised last week when they pulled two clear-plastic fish traps from Owl Creek in East Lee County.