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Bluefin tuna


Bluefin tuna is Pisces Actinopterygii Perciformes suborder Mackerel Mackerel Division One , globally distributed in tropical to temperate waters of all oceans , habitat depth of 50-2473 meters , up to 225 cm in length , as migratory pelagic fish , flocks activities are carnivorous fishes , cephalopods , crustaceans , can be used as food fish , game fish and farmed fish .
1 shape features
Bluefin tuna length 185-225 cm , weighs about 150 kg.
Bluefin tuna bluefin tuna in the North Pacific bluefin tuna and Atlantic Tunas look almost exactly the same , some of the authorities that they belong to two separate populations. However, recent genetic analysis showed that the two populations are regarded as the best full population . Since this has not to be confused with the two populations , so as to separate them to manage populations .
North Pacific bluefin tuna live in Japan and the Philippines , the Sea of ​​Japan in southern Honshu . Most females may spawn as many as 1 billion . Juveniles under the action of ocean currents northward . Some juveniles migrate east to the Pacific coast of North America , in the western Pacific breeding. Most tuna in 2 years when the return , and some want to go back over a longer period of time .
According to records, the largest in the Pacific bluefin tuna weighing 555 kg body weight , body length of up to 3 meters . However, due to overfishing of tuna , tuna individual average weight now only up to 7 kg. North Pacific bluefin tuna sexual maturity around the age of 5 , the highest life expectancy of 25 years.
2 . Distribution
Distributed in the world 's oceans in tropical to temperate waters of the southern hemisphere is more concentrated in the Southeast Asian island of Java , and the Indonesian waters to breed.
3 Habits
Bluefin tuna is a migratory pelagic fish, flocks of activity , the fastest they can reach 70 kilometers per hour, but usually slow swimming speed , swimming only 2-3 kilometers per hour . Are carnivorous , to fish , cephalopods , crustaceans , [ 1 ] the growth and reproduction of bluefin tuna breeding season is from September arrival in March , in Indonesian waters to spawn , the female will produce each breeding season eggs 1000000 . 8 -year-old female sexual maturity , when the body length of about 1.5 meters . Wild bluefin tuna normal life of up to 40 years.

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