Cottus rhenanus is a species of ray-finned fishes in the family sculpins. They are associated with freshwater habitat. Individuals can grow to 10.0 cm.
Europe: streams of Rhine and Meuse drainages, in Rhine extending upriver (southwards) to about Mannheim, including tributaries of River Main and Neckar in Germany
Definition: A habitat that is in or on a body of water containing low concentrations of dissolved salts and other total dissolved solids (<0.5 grams dissolved salts per litre).
Definition: Gravel is an environmental material which is composed of pieces of rock that are at least two millimeters (2mm) in its largest dimension and no more than 75 millimeters.
Definition: length of a fish measured from the tip of the snout to the posterior end of the last vertebra or to the posterior end of the midlateral portion of the hypural plate. Simply put, this measurement excludes the length of the caudal fin
