Yellowfin tuna (Thunus albacares), also known as ahi tuna from their Hawaiian name, are epipelagic- they exist in the upper 300 feet of the seas. These graceful fish can weigh over 400 pounds and swim steadily at over 20 miles per hour. Research has found that it may be the mineral Magnetite, present in neural pits in the tuna’s snout, which helps the tuna to navigate, through its detection of the earth’s magnetic field. Visit portfolio page to learn more.