Facts about Tuna
- 09
Albacore tuna contain approximately 200 milligrams of omega-3 fatty acids per 100-gram serving, making them among the richest dietary sources of this essential nutrient.
- 08
Unlike most fish, tuna must swim continuously to breathe, as they rely on ram ventilation to force oxygenated water across their gills.
- 07
Skipjack tuna possess a unique circulatory system where blood vessels form a heat-exchange network called a rete mirabile, allowing them to retain metabolic heat in their swimming muscles during deep dives.
- 06
Yellowfin tuna eyeballs contain specialized retinal tissues that enable them to detect bioluminescent prey in the deep ocean twilight zone at depths exceeding 600 meters.
- 05
Commercial fishing fleets catch approximately 1.7 million metric tons of tuna annually, making it the world's most harvested fish species by weight.
- 04
The mercury concentration in tuna flesh can reach 0.5 to 1.0 parts per million, making it one of the most contaminated seafood species for human consumption.
- 03
In 2013, scientists discovered that Pacific bluefin tuna migrate across the entire ocean basin, with one tagged individual traveling from Japan to California and back, covering approximately 44,000 miles in six years.
- 02
A single yellowfin tuna can produce up to 5 million eggs during spawning season, far exceeding most other fish species in reproductive output.
- 01
Bluefin tuna can swim at speeds exceeding 40 miles per hour and maintain body temperatures 14 degrees Fahrenheit above surrounding water.