The United Nations established World Tuna Day to highlight the importance of tuna and the need to manage fisheries sustainably. These fish are also worth celebrating for the way they’re built.
A bluefin tuna has a streamlined body and a crescent-shaped tail that drives it through the water. It can retain heat produced by swimming and keep some tissues warmer than the surrounding sea. Look for the little row of finlets between its main fins and tail. They’re easy to miss on a fish that looks built for speed from nose to tail.
About the observance
https://www.un.org/en/observances/tuna-day
More about the featured species
https://www.fisheries.noaa.gov/feature-story/fun-facts-about-atlantic-tunas