This goldfish isn't native to the area, but they aren't invasive, Houck said. He and Scott Robinson, who was working with him, put the fish back in the water after they took a couple of photos.

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.

The Greater Louisville Koi and Goldfish Society will host its 28th annual Koi & Goldfish Show from May 23-25. The show is free and open to the public on Memorial Day weekend.