Scientists Create Peanut Butter Jellyfish

Moon jellyfish fed peanut butter — Peanut butter jelly time ... Moon jellies fed peanut butter grew big (and took on a brownish hue).

(Image credit: P. Zelda Montoya and Barrett L. Christie, Dallas Zoo and Children's Aquarium)

It's a lunchroom staple and now an aquarium oddity. For some reason, scientists have created the first-ever peanut butter jellyfish.

By blending all-natural creamy peanut butter with saltwater and adding it to the tanks of moon jellies, aquarists at the Dallas Zoo and Children's Aquarium created an "unholy amalgamation of America's favorite lunchtime treat and live cnidarians."

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Worry not for the experimental jellies: The scarfed the peanut-butter protein out of their tanks and actually grew about 0.2 inches (4 millimeters) in 8 days. They also took on a brownish hue thanks to "peanutbutterocity," the aquarists wrote. Goofy as the experiment was, peanut butter is a potential source of protein for jellies, fish and other aquarium residents, Montoya and Christie wrote. "We hope this ridiculous experiment illustrates that unconventional approaches in husbandry are at the very least, worth trying once," they wrote.

Stephanie Pappas is a contributing writer for Live Science, covering topics ranging from geoscience to archaeology to the human brain and behavior. She was previously a senior writer for Live Science but is now a freelancer based in Denver, Colorado, and regularly contributes to Scientific American and The Monitor, the monthly magazine of the American Psychological Association. Stephanie received a bachelor's degree in psychology from the University of South Carolina and a graduate certificate in science communication from the University of California, Santa Cruz.