A live aquatic animal transport system (10) comprises container (12) that holds a volume of water and one or more isve aquatic animals (16). An oxygen is delivery system (17) and control system (24) cooperate to deliver oxygen at a rate required to maintain a dissolved oxygen concentration in the water within a selectable range. The oxygen delivery system (17) can comprise an oxygen tank, or an oxygen selective membrane. One or more dissolved oxygen sensors (44) provide signals representative of dissolved oxygen concentration in the water which is then used to control the supply of oxygen. A carbon dioxide stripper (28) removes carbon dioxide from water held within the container (12). A sensor (46) provides a signal indicative of the level of carbon dioxide in the water. The sensor may for example be a pH probe.