It has a flattened slab-sided body that is silvery in color. In addition, the mooneye has teeth on the tongue and on the middle of the roof of the mouth. Life History A spring spawner, the mooneye migrates into medium to large-sized rivers from March through May to deposit its eggs.
Adults deposit the eggs over rocks in swift water areas.
The eggs are covered in a gelatinous material similar to frog's eggs. Female mooneye release approximately 10,000-20,000 eggs. By the end of the first year, a mooneye grows to be four inches in length. In Lake Champlain, the mooneye reaches 12 inches in length by age eight. The mooneye eats a wide variety of organisms including insects, crustaceans, small fish, and mollusks.