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| | Tuna |
 | | Tuna are finfish belonging to the tribe Thunnini, a sub-grouping of the mackerel family (Scombridae), which also includes the mackerels, bonitos, and the skipjacks. |
 | | Tuna are considered epipelagic-to-midwater fish, inhabiting the upper and middle layers of ocean water, to a depth of 1,600 feet or more (500 m), depending on size and species. |
 | | Tunas have a circulatory and respiratory system that is unique among fish, enabling them to maintain a body temperature slightly higher than the surrounding water. |
| seagrant.gso.uri.edu /factsheets/tuna.html (1667 words) |
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