The Oriental Bluefin Tuna (Thunnus...
Michelle Chou last edited by
The second largest tuna can grow up to 3 meters and 450 kilograms. Although it is called bluefin tuna, its closest relative is long-fin tuna, and then it is the northern and southern bluefin tuna. Like other tunas, they have a warm blood circulation system, which can be up to 20 degrees Celsius above the surrounding water temperature, giving them superior endurance and long-distance migration capabilities, even across the entire Pacific Ocean. It takes a lot of food to keep warm. It's a greedy hunter who doesn't let go of any social fish and squid (larvae sometimes eat krill and ocean crab). Usually within 200 meters of the sea surface hunting, occasionally will dive to 550 meters.
Oriental bluefin tunas live 15 to 26 years and take five years to grow to 1.5 meters and 60 kilograms to mature. It is believed to have only one population, reproducing in the Northwest Pacific and the Sea of Japan. Young Oriental bluefin tunas head to the southwest and northeast Pacific Ocean for food in several groups, return to their birthplaces to breed in adulthood, and then return to foraging, recycling. Occasionally visit other parts of the South Pacific (the world's fish bank map is a bit messy).
Because body shape and athletic ability have become the target of many sea fishing enthusiasts, but there are quota restrictions everywhere. Since modern times, it has been overfished for its fat meat, which is considered one of the best Japanese cooking materials. The resources are seriously declining (the existing stock may be only 2.6% before being caught in large quantities), and the current protection level is VU. Wild populations of Oriental bluefin tuna have been receiving considerable attention, with limited fishing and no fishing allowed in breeding grounds. In addition, the Oriental bluefin tuna of Jiji University has been bred to the third generation of offspring. Now there are two offspring on the market (from 79 to 2002, the second generation was successfully bred in 2002, and the second generation was bred in 2007), and the quality is more secure than the wild population. However, there are still some local people (also in China) who admire wild populations and sell them at high prices. If you want to eat, try to choose full-scale artificial breeding individuals. They are kept in some aquariums.
Figure 1: americanlivewire.com
Figure 2: Marine sciencetoday.com
Figure 3: www.pewtrusts.org
Figure 4: opencage. info
Fig. 5: www.intrafish.com
Figure 6: Fishwithjd.com
Figure VII: www.marlinmag.com
Figure 8: www.iusarecords.com
Figure 9: www.aquamap.com