Involved in oxygen transport from gills to the various peripheral tissues. Hb 2 is a heterotetramer of two alpha-2 and two beta-2 chains. Red blood cells. This fish has two hemoglobins: Hb1 (major) and Hb2 (about 15-20% of the total). They display the Root effect and the alkaline Bohr effect, which is enhanced by organophosphate and to a lesser extent by chloride. Belongs to the globin family.