Cottus ClavigerCottus is a genus of the sculpin family Cottidae. They are often referred to as the "freshwater sculpins", as they are the principal genus of sculpins to be found in fresh water. They are native to the Palearctic and Nearctic. They are small fish, mostly less than 15 cm (6 in) in length, although a few species can reach twice that size. This is a demonstration store. This product, and its image and text, is placeholder only. Image source: Wikipedia