The Yellowfin Tuna is smaller then the Bluefin Tuna, however, weighing as much as 400 pounds it is certainly not a small fish.
The Yellowfin can reach lengths of over 7½ feet long and 3 feet high.
Most of the time Yellowfin like to spend their time in deeper offshore waters.
Yellowfin tuna can be found in warm waters world wide, such as, though not limited to, the Caribbean Sea, Pacific and Indian Oceans.
Yellowfin tuna are know as epipelagic fish because they live in a mixed surface layer of the ocean above the thermocline.
It has been discovered thru "Sonic Tracking" that Yellowfin tuna range in the first 328 feet of the water depth and very rarely dive below the thermocline.
However, Yellowfin tuna has the capability of diving to very low depths.
When one particular Yellowfin tuna was tagged in the Indian Ocean, it was found, that it spent most of its' time in shallow water no deeper than 250 feet.
However, it did at one point dive to an unheard of 3,800 feet.
Yellowfin may venture well inshore when water temperature, clarity and weather are suitable and/or food is abundant.
The prey that Yellowfins are known to eat is quite vast that includes fish, crustaceans, squid, flying fish, mackerel, myctophids or lanternfish and sardines are also frequently eaten.
Larger Yellowfin have been recorded to even prey on smaller members of the tuna family such as frigate mackerel and skipjack tuna.
The Yellowfin is common in both commercial and sport fishing.
However, in some areas where commercial fishing is high the sustainability is low.
If you catch a Yellowfin or any other fish and do not have the,intentions of eating it, please, release it.
The quicker a fish is released the less likely it will die.
Someone else might catch that fish for fun also or maybe just a poor villager might catch it to feed their possibly starving family.