Indian tuna (Istiompax indica)…

Indian tuna (Istiompax indica)
Indian tuna is the only species widely distributed in warm waters of the Indo-Pacific Ocean, because its deep back color is also known as black marlin. Originally classified together with bluefin as Tuna, it is listed as a separate genus, marked by the non-lowering pectoral fin (hence known as the standing fin swordfish) and the alignment of the second dorsal fin with the second buttock fin, usually without markings. In the family Salamanderidae, the size is second only to blue tuna, with a maximum fork length of 4.65 meters (up to the tail bifurcation) and a weight of 750 kg. It can also rank in the entire order Spokefin. Black tuna may also be the fastest fish. According to Wikipedia, the speed of releasing the line can reach 105 kilometers per hour, or even 130 kilometers per hour.)
Indian tuna is a powerful top predator, feeding mainly on fish and squid, especially small or juvenile tuna (which may weigh up to one tenth of its own weight), if in large quantities. According to the analysis of stomach contents, Indian tuna will slam their prey with their snout before swallowing it (just like the dolphin in Figure 7).) Although black tuna usually stay on the surface of the ocean, they have a head temperature that keeps their senses sharp in cold water, and the deepest diving depth is 915 meters, but the average diving depth is only 206 meters per day. The bigger the fish, the longer they stay in depth (though only more than 10 percent).) On the eastern coast of Australia, black tunas expand their range of activities around the full moon and the next week to catch prey farther into the ocean, making them easier to catch.
Life expectancy is unknown, growth is fast, 15 kilograms a year, 50 kilograms a year, three years, if enough food, 10-12-year-old females may have 450 kilograms. For the West Pacific population, the average sexual maturity of females (50% of individual maturity) is about 1.95 metres in length (from eye size to tail bifurcation, the other is 2.3 metres in length), with an average age of 5.4 (from 4 to 5 years old), while that of males is much smaller, with a maturity of 1.4 metres at 2 years old. Large individuals are females, and males rarely exceed 2.7 meters and 90 kilograms. He likes to breed in the water of 27-28 C. The maximum number of eggs can reach 40 million. During the breeding period, he breeds once every 2.8 days on average. Usually several males pursue a female (familiar introduction).)
Very well-known fishing fish, rare with extreme speed and super-large bony predators, and better at jumping acrobatics than blue tuna to get rid of the hook, ornamental (provided you don’t poke at it, it’s not never happened)) Like other tuna, the meat is good and suitable for frying. It has certain economic value but is unstable. At present, there is no assessment of conservation grade, but considering the enrichment effect of high trophic level, occasional taste is enough.

Figure 1: kekoa.com.au
Figure 2: fishtrack.com
Figure 3: granderwatch.com
Figure 4: eagle-review.com
Fig. 5: kingfishcabo.com
Figure 6: Pinterest.com
Figure 7: alamy.com
Figure 8: Frasercoastchronicle.com.au
Figure IX: aquamap.org