The head and backbone are removed, and the belly piece is separated. ext these pieces of tuna are processed by means of boiling, smoking and sun-drying until they acquire a wood-like appearance. Being dried in this manner, the fish can be kept indefinitely without refrigeration. It is a low fat high quality protein that is rich in Omega -3 fatty acids . The Omega-3 fatty acids help in preventing irregular heartbeats, which in turn reduces the risks of blood clotting.