In this study, the effects of elevated levels of dissolved carbon dioxide were investigated in a marine recirculation system on the development of cataracts in juvenile Atlantic cod, Gadus morhua. Replicate groups (n = 9), at an initial average weight of 23.5±0.8 g, were exposed to one of the three levels of dissolved CO2: low (6.99±0.021 mg/L), mid (12.23±0.013 mg/L), or high (19.77±0.029…