Asian carp (especially silver carp) may be capable of jumping over some barriers, including low dams. High water often creates an 'open river' condition as Mississippi River dams open their gates, which may allow invasive carps to move past what is otherwise a barrier. Flooding can spread these fish as well, because flooding can connect water bodies that aren't normally connected. Invasive carp are also spread by humans. The release of live bait containing young carp has introduced these fish to other water bodies. Barge and recreational watercraft moving through Mississippi River locks may also permit invasive carp to move through as well. Experts are worried that if these fish get into the Great Lakes, they may negatively affect the area's $7 billion/year fishing industry and if they spread further north in Minnesota they could threaten the resort and sport fishing industry. By out-competing native fish species for food and habitat, carp may reduce the populations of native fish that are so important to anglers.