MONTGOMERY, Ala. (AP) — Conservation officials say they believe an invasive fish species famous for jumping at boaters hasn’t spread into most Alabama waters.

A news release by the Alabama Department of Conservation and Natural Resources said silver carp were first found in state waters about five years ago.

While biologists are worried the fish will spread across the state, studies so far have shown the species is limited mainly to north Alabama’s Pickwick and Wheeler reservoirs in north Alabama. Pickwick, located in extreme northwest Alabama, has the state’s largest population.

Online videos show silver carp jumping around and into boats when startled, presenting a potential danger to people on the water.

“Once silver carp get scared, they jump out of the water, which can be hazardous for someone in a bass boat or on a jet ski,” Chris Greene, the state fisheries chief, said in the release. “It’s definitely a safety concern.”

The fish also have done damage to waterways in Tennessee and Kentucky, according to the department. The fish consume lots of plankton and break up the food chain for other, more desirable species.