Numbers of Nonindigenous Aquatic Species in the US by Pathway of Introduction
•Aquarium pet releases    161
•Sportfishing                     114
•Bait bucket releases            94
•Forage                                 48
•Human food                         22
•Conservation                       21
•Biocontrol                            20
•Ornamental                         19
•Aquaculture farms                  6
•Unknown                                4
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Here is list that demonstrates the number of different species introduced and how they were introduced in the United States only.  This includes more than just fishes.