|This information contains
historical data that may be very old, but it does give a pretty complete
picture of what has gone on in the basin over the years. Not all established.
Many records based on one-time occurrences. Stockings are listed even if they
failed. Extirpated populations are
also in the database. Introductions
have occurred due to gamefish stocking, bait bucket, aquariums, pet releases,
ballast water (zms, mitten crab) and incidently with plants.