Abstract: In a fish scaling machine having a framework, a power source, a conveyor supporting one side of a fish and a hold down assembly yieldably engaging the other side of the fish, a descaler roll mounted on a drive shaft journaled upon the framework and connected to the power source. A pair of aligned engaging cylindrical roller bodies having right angular end faces are mounted end to end upon the drive shaft and secured thereto. Generally parallel helical teeth upon, around and projecting from each roller body, the teeth on said bodies being inclined rearwardly toward each other at an acute angle to the drive shaft. Teeth at their one ends extending to an end face of each roll body and with their other ends having axial projections extending outward of their other end faces, the teeth extensions of one roller body overlying the other roller body, extending between and interlocked with the adjacent teeth of the other roll body at their engaging end faces.