Non-native fish: The controversy, impacts and management

Non-indigenous fish are widespread across the globe. There is evidence that the rate of introductions is increasing. But how these fish impact the receiving ecosystem is unclear. Impacts of non-native fish are a controversial issue. Much evidence of their impacts is anecdotal and precise effects are difficult to pinpoint. When coupled with other impacts to the system (e.g., anthropogenic influences), determining the changes brought on solely by new species is further confounded.