Wolves and orcas hunt in packs, but they’re not the only ones: electric eels in the rivers of the Amazon do it, too, according to a 'shocking' discovery from 2021. ScienceMagArchives
When darkness comes, electric eels emerge from South American river bottoms to attack their prey with up to 860 volts of electricity—enough to kill a person. Now, scientists have revealed the snakelike fish don't always go it alone: They hunt in packs, similar to wolves, orcas, and some species of tuna. The finding, a first among electric fishes, may open the way for new studies to investigate when social predation evolved among fishes.
Bastos witnessed the attack on an expedition looking for endangered fish in northern Brazil. Two years later, he went back for a closer look. Camping alone in the middle of the Amazon—a 5-day journey by boat from the nearest city of Altamira—he filmed hundreds of electric eels in groups of 10 repeatedly attacking small tetra fishes on the Iriri River, a tributary of the Xingu River in northern Brazil. The eels wereMost of the time, the eels rested at the bottom of the river.
The study is"a fascinating example of careful natural history detective work," says William Crampton, a biologist at the University of Central Florida who was not part of the work. He has been studying electric fishes for 25 years and says the findings could spur further research into how the eels use electric discharges to navigate and communicate.
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