Involved in oxygen transport from gills to the various peripheral tissues. Hb1 is a heterotetramer of two alpha-1 chains and two beta-1 chains. Red blood cells. This fish has two hemoglobins: Hb1 (major) and Hb2. Hb1 has low oxygen affinity, it displays a pronounced Bohr effect, which is enhanced by ATP, and a pronounced Root effect. Belongs to the globin family.