ABSTRACT
Possible relations between the body condition of rainbow trout (Oncorhynchs mykiss) and the density of salmonid fishes, the abundance of non-salmonid fishes, and two measures of biological productivity—total dissolved solids and elevation above mean sea level—were assessed for 13 small (< 170 surface hectares) reservoirs in Wyoming. The mean condition of rainbow trout was positively related to total dissolved solids and negatively related to the abundance of non-salmonid fishes.