 Their heart rate is also affected by temperature; at normal temperatures can it reach up to 200 beats/min.The blood of southern bluefin tuna is composed of erythrocytes, reticulocytes, ghost cells, lymphocytes, thrombocytes, eosinophilic granulocytes, neutrophilic granulocytes, and monocytes.Southern bluefin tuna has a high blood hemoglobin content (13.25—17.92 g/dl) and, therefore, a high oxygen carrying capacity.