Scientists have discovered another apparent first, according to new research published in Science: a fully warm-blooded fish.
The opah, which researchers say dwells in the cold, dark depths of the ocean, is able to produce heat by constantly flapping its fins like wings as it moves about, keeping its blood warm as it circulates throughout its body. The opah’s warm-bloodedness is advantageous for the fish, as it’s able to keep itself at least 5 degrees Celsius warmer than its surrounding water and move about quickly to prey on other fish.
The researchers from the National Oceanic and Atmospheric Association said the fish is the first known one to be identified as fully warm-blooded, a characteristic typical to mammals and birds; tuna and shark are only partially endothermic, meaning warm blood pumps to only select organs.
Researchers told the Washington Post on Thursday they were curious about the fish given its large size, big eyes, and agility in cold water.
- Inside One Indian iPhone Factory
- Congress Avoided a Shutdown. What Happens Next?
- Global Climate Solutions Exist. It's Time to Deploy Them
- What Happens to Diane Feinstein's Senate Seat
- The Enduring Charm of John Grisham
- Who The Golden Bachelor Leaves Out
- Kerry Washington: The Story of My Abortion
- Want Weekly Recs on What to Watch, Read, and More? Sign Up for Worth Your Time
