A qualitative comparison of species compositions, relative abundances, diversity and growth was made between tidal pool fishes collected in Port Renfrew, British Columbia and Bruels Point, California. The two most preponderant cottid speciesOligocottus maculosusandClinocottus globicepswere aged using vertebrae, from which back calculated growth values were obtained. Species from Port Renfrew were found to have a higher diversity index, greater species composition and abundance. No growth differences were found between the two localities despite the 1120 km (700 miles) separating then.