Weird Jumping Alien Asian Carp Invade the Illinois River. In the 1970's silver carp were accidentally introduced into the Illinois River after escaping from a fish farm. The fish mistake pressure waves from the propellors of the boat's motors for the movements of predators and jump with fright. Each jumping fish scares its neighbour, causing a dangerous chain reaction.From our series "Swarm", Narrated By David Tennant
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