This family contains 5 genera 15 species of tuna, and the size of each species varies greatly. The smallest tuna is Coilia oleifera, the largest is 50 cm long and weighs 1.8 kg. The largest tuna is Atlantic bluefin tuna, with a maximum length of 4.6 meters, a weight of 684 kilograms and an average body length of 2 meters.
Tuna is tapered at both ends, with a moderate mouth and well-developed teeth. The branchial membrane is not attached to the pharyngeal isthmus. Scales are cycloidal, usually small, and their body color is metallic, usually blue and silver. Tuna has dark stripes and fins.
Tuna is a species that can keep its body temperature higher than the surrounding water temperature. They are active and agile carnivores with smooth and streamlined bodies, and they are also one of the fastest swimming pelagic fish. Tuna can be found in warm waters, which has become a popular fish in a large number of commercial fishing and fishing activities.
Tuna food:
Tuna is an active predator, which feeds on various organisms. A single kind of food includes crabs, shrimps, squid, crustaceans, fish and invertebrates, as well as fish about 1 m long. Some smaller species filter zooplankton through gill rakes. Tuna feed on all kinds of pelagic and pelagic fish, and mackerel is their favorite food.