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Illegal Stocking is a Multi-faceted Problem
Type of release |
Presumed purpose of introduction |
Examples |
Aquarium and ornamentals |
To liberate or dispose of unwanted pets |
koi, pirahna, pacu, cichlids |
Bait bucket releases |
To liberate or dispose of unwanted bait after fishing |
minnows, amphibians, crayfish and other invertebrates |
Sport fish |
To establish or enhance a sport fishery |
northern pike, largemouth bass |
Forage enhancement |
To establish prey organisms, usually to increase growth of sport fish |
minnows, crayfish |
Live food fish |
To establish fisheries for the live food fish trade |
snakehead, bighead carp |
Harvestable fauna |
To establish or enhance harvestable populations for trade |
crayfish, frogs
|
Escapes from commercial aquaculture |
None; introductions into public waters result from irresponsible aquacultural practices or improper regulatory oversight | tilapia, salmonids |
Escapes from private waters |
None; introductions into public waters result from improper regulatory oversight |
any sport or food fish or other aquatic animal |
This site produced by Dr. Brett Johnson, Fisheries and Aquatic Sciences Professor at Colorado State University.
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