June 8, 2018 — The fish buyer noticed something different about the large, colorful, disc-shaped opah waiting to be sold at the auction house in Honolulu. Among the differences: One fish had a bigger eye than the other.
His curiosity set in motion DNA testing and more sleuthing that led to the identification of three new species of opah — a peculiar deep-diving fish recently found to be the first fully warmblooded fish.
“The more we looked, the more differences we could pull out,” said Karen Underkoffler, lead author of a recently published paper in the peer-reviewed journal Zootaxa that describes the anatomical characteristics of the different species of opah, including one marked by its big eyes and a purple tongue.
In all, the team of scientists with National Oceanic and Atmospheric Administration Fisheries identified five distinct species of opah, revealing that there isn’t a single global species. Three are newly identified, one was already named and researchers better identified another that had been previously described.
Read the full story from the Associated Press at The Honolulu Star Advertiser