Grand River, Kitchener, Ontario, Canada A Rock Bass cleaning a potential nest site while a pair of smaller Rock Bass swim around it before being chased away in the evening

Grand River, Kitchener, Ontario, Canada A Rock Bass swimming very closely to the lens of the camera and diligently clearing away bottom substrate with its mouth in the afternoon

Grand River, Kitchener, Ontario, Canada A Rock Rass patrolling the territory around and in front of the camera before aggressively chasing away an intruding Rock Bass in the afternoon

Grand River, Kitchener, Ontario, Canada A Rock Bass aggressively biting and tail slapping at the camera before continuing to clear a potential nesting site in the evening

Grand River, Kitchener, Ontario, Canada A Rock Bass persistently clearing away bottom substrate with its mouth and displaying aggressive actions towards the camera in the evening

Grand River, Kitchener, Ontario, Canada A Rock Bass clearing a possible nesting site and attempting to cough up debris caught in its mouth during the evening