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A tuna (pl.: tunas or tuna) is a saltwater fish that belongs to the tribe Thunnini, a subgrouping of the Scombridae family.The Thunnini comprise 17 species across five genera, [2] the sizes of which vary greatly, ranging from the bullet tuna (max length: 50 cm or 1.6 ft, weight: 1.8 kg or 4 lb) up to the Atlantic bluefin tuna (max length: 4.6 m or 15 ft, weight: 684 kg or 1,508 lb), which ...
Sagan goes on to extend the comparison in terms of surface area, explaining that if the Cosmic Calendar were scaled to the size of a football field, then "all of human history would occupy an area the size of [his] hand". [3] A similar analogy used to visualize the geologic time scale and the history of life on Earth is the Geologic Calendar.
There's a new study of Earth's marine life that suggests the ocean has gotten alarmingly roomy. To put a finer point on it, there are half as many fish in the sea today as there were in 1970 ...
All tunas are extremely strong, muscular swimmers, and the yellowfin tuna is known to reach speeds of up to 50 miles per hour (80 km/h) when pursuing prey. As with all tunas, members of this genus are warm-blooded , which is a rare trait among fish; this enables them to tolerate cold waters and to dive to deeper depths. [ 3 ]
Southern bluefin tuna, as well as other species of tunas, have developed many adaptations in order to achieve this. [6] Their respiratory system has adapted to rapidly take up oxygen from water. For example, tunas switched from a buccal-opercular pump system to ram ventilation, which allows them to drive large quantities of water over their gills.
Winning these new year auctions is often used as a way to get publicity, which raises the prices considerably higher than their usual market value: on 5 January 2013, a 489-pound (222 kg) Pacific bluefin tuna caught off northeastern Japan was sold in the first auction of the year at the Tsukiji fish market in Tokyo for a record 155.4 million ...
Image credits: Old-time Photos "That's why funny, unexpected and random events in old photos always seem so much more magical to me," Ed continued. "The odds of capturing that moment were ...
More than 99 percent of all species, amounting to over five billion species, [7] that ever lived on Earth are estimated to be extinct. [8] [9] Estimates on the number of Earth's current species range from 10 million to 14 million, [10] of which about 1.2 million have been documented and over 86 percent have not yet been described. [11]