The Northern Bluefin Tuna or (Thunnus thynnus) is was one of the most popular forms of tuna. Recent overfishing though has pushed this fish to the brink of extinction. This fish is often used when making sushi, not normally the kind you would find in canned tuna. The Northern Bluefin Tuna can live for about 30 years, but rarely gets to that age due to commercial fishing. Often found in schools these fish are considered to be very easy to catch. 
The largest recorded Northern Bluefin Tuna was 4.3 m (14 ft) and weighed a massive 680 kg (1,496 lb)! That is one big Tunafish! One thing that sets this fish apart from other is their unique circulatory system. Northern Bluefin Tuna have some of the highest amount of hemoglobin per unit of blood among fish. Also known as Atlantic Bluefin these fish are homeothermic ("warm-blooded") and are therefore able to thermoregulate. This process keeps their body temperatures higher than the surrounding water, which is why they are able to survive in colder waters. This salt water fish is a carnivore that hunts sardines, herring, mackerel, squid and crustaceans. If you have any other fishing tips or recipes for Northern Bluefin Tuna you would like to share please leave them in the comments below...
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