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How can catfish appear in our pond?

How can catfish appear in our pond? I have seen this a few times. There are basicly three primary ways for fish to end up in new ponds. There are three primary ways for fish to end up in new ponds. ...
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How can catfish appear in our pond?

Ducks (and other animals) can transport fish (and other aquatic) eggs (and seeds etc.) on their feet or other parts of their bodies. This is a main way that life moves from water body to water body.
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