Involved in oxygen transport from gills to the various peripheral tissues. Heterotetramer of two alpha chains and two beta chains. Red blood cells. This fish has two hemoglobins: cathodic and anodic. Cathodic Hb has high oxygen affinity, low cooperativity and displays a small reverse Bohr effect. Anodic Hb has low oxygen affinity and cooperativity and displays a normal Bohr effect. Belongs to the globin family.