The yellowfin tuna is among the larger tuna species, reaching weights over 180 kg (400 lb) .Yellowfin tuna are epipelagic fish that inhabit the mixed surface layer of the ocean above the thermocline. Sonic tracking has found that although yellowfin tuna, unlike the related bigeye tuna, mostly range in the top 100 m (330 ft) of the water column and penetrate the thermocline relatively infrequently, they are capable of diving to considerable depths.
Tuna meat is rich in protein (Average 21.21%) Omega-3 and Omega-6 fatty acids occur in high quantities in this fish. It is very effective in regulating hormonal levels and also improves the elasticity of blood vessels and capillaries. It helps in lowering cancer-causing agents and thus prevents the risk of many cancers. It is beneficial in lowering bad cholesterol levels.It is rich in essential oils, vitamins and minerals. It contains energy 130 calorie, vitamins A, B6, B12, C, D, E and K. Trace minerals include zinc and copper. Antioxidant Coenzyme Q10 is also found.