It is filled with native species of fish found in typical warm water lakes in South Dakota. Northern pike, largemouth bass, walleye, perch, bluegills, catfish and crappie are often temporary inhabitants of the tank. The fish are fed on Tuesday and Saturday mornings. Visitors often stop to see how and what the fish like to eat. Looking into the aquarium, visitors will feel like they are in a cutaway of a streambank.
Roots protrude into the water from the bank of the stream.
Visitors can often find several perch and crappie tucked into the roots, staying away from the predator fish like the northern pike. As visitors walk through the museum, their motion triggers the sound system. When someone walks by the woodland diorama, they should listen for the sounds of a deer walking through the woods, a turkey gobbling, a great horned owl, a yellow bellied sapsucker and more. Near the wetland you will hear geese flying by, ducks quacking, a muskrat splashing, a red-winged blackbird and more. Visitors should listen carefully for all the sounds in the museum.