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Documenting Over a Century of Aquatic Introductions in the U.S. Annotated Checklist of Introduced Invasive Fishes in Mexico, With Comments on Some Recent Introductions * Intentional Introductions * Aquarium and Watergarden Trade * Bait * Ballast Water Vector * Aquaculture Vector. Canals and Diversions * Climate Change as a Vector of Range Expansion * Why Some Introductions Succeed While Others Fail.
A Sat, study studied this question.