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www.reference.com/world-view/bluefin-tuna-expensive-f62599f3290cef42

Bluefin tuna is expensive because it’s in such high demand in Japan. According to “Why Tuna's Both Cheap and Expensive, Plentiful and Very Endangered,” a bluefin tuna caught off Long Island goes straight to Japan, where a 500-pound fish can sell for as much as $1.8 million.

www.reference.com/article/bluefin-tuna-eat-2115ac87776a1f49

Bluefin tuna feed primarily on other fish, including herring, anchovies, sardines and mackerel, according to the Office of Protected Resources. Young bluefin tuna also eat some crustaceans. The bluefin tuna is the largest of the tuna species, and it is an important large predator in the Atlantic Oce

www.reference.com/world-view/bluefin-tuna-season-e3ffcdc57c0c2b0b

Bluefin tuna fishing season is year round. Certain months are better than others for fishing for bluefin tuna, depending on the region and the species.

www.reference.com/world-view/biggest-bluefin-tuna-ever-caught-2446012839b48e9c

As of 2014, the largest bluefin tuna ever caught measured 13 feet and weighed 1,496 pounds. The fish was caught by Ken Fraser on Oct. 26, 1979 off the coast of Nova Scotia.

www.reference.com/article/tuna-good-491c642780fa8130

Tuna is a healthy fish to eat, to a certain degree. As a fatty, cold-water fish, it is rich in omega-3 fatty acids. These are fats that help regulate cholesterol levels and protect against cardiovascular disease.

www.reference.com/world-view/canned-tuna-bad-5a1deb870adb740

Canned tuna, like all canned meats that are not kept in a refrigerator before being opened, are considered non-perishable items. Despite having a use-by date, if the can does not show signs of denting, rusting, leaking or bulging, the tuna is generally safe to eat.

www.reference.com/article/eats-tuna-fish-9665104e0bc5ce91

Besides humans, tuna fish are eaten by sharks, rays, larger tuna and billfish, such as marlins. Juvenile yellowfin tuna are often prey for seabirds and fish, such as wahoo. Large, adult tuna can only be handled by predators, such as sharks, marlins and toothed whales similar to false killer whales.

www.reference.com/article/can-dogs-eat-tuna-cab48e5f7a191d33

Tuna is a healthy source of lean protein for dogs, as long as the correct amount is administered in the correct way, according to The Nest. It is recommended to feed a dog canned tuna packed in water.

www.reference.com/article/many-calories-can-tuna-3604788c06a6ca0e

An estimated 179 calories is in a single can of light tuna stored in water. Calorie content can vary by brand, can size and if the tuna is stored in water or oil.

www.reference.com/article/dangerous-eat-much-tuna-37687642d4c4a4f0

Consuming excessive amounts of tuna can lead to mercury poisoning. High amounts of mercury can damage the brain and nervous system, particularly in children and pregnant women.