Predicted to enable carbonate dehydratase activity. Predicted to be located in membrane. Predicted to be active in plasma membrane. Is expressed in several structures, including Kupffer's vesicle; brain; digestive system; forerunner cell group; and renal system. Human ortholog(s) of this gene implicated in hepatitis B; lung non-small cell carcinoma; and renal cell carcinoma. Orthologous to human CA9 (carbonic anhydrase 9).