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If the fish is an adult koi, it's a relatively small one, Cohen said. Koi can grow to be up to three feet, according to the Smithsonian's National Zoo and Conservation Biology Institute.

Koi and goldfish also have the potential to carry diseases such as koi herpesvirus that can harm local fish populations. Motz said animal dumping has been an ongoing issue at Lititz Springs Park.

It raises millions of goldfish and koi. For the next story of our Grown IN Indiana series, we visit one of the oldest private fish farms in the country. News Sports Indy 500 Things To Do Opinion ...