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Lionfish characteristics make them more 'terminator' than predator
Date:8/14/2014

SACRAMENTO, Calif. New research on the predatory nature of red lionfish, the invasive Pacific Ocean species that is decimating native fish populations in parts of the Caribbean Sea and Atlantic Ocean, seems to indicate that lionfish are not just a predator, but more like the "terminator" of movie fame.

The finding of behavior that was called "alarming" was presented today by Kurt Ingeman, a researcher from Oregon State University, at the annual meeting of the Ecological Society of America.

Most native predatory fish are attracted to prey when their numbers are high, when successful attacks are easy and when a minimum of energy is needed to catch and eat other fish, according to previous research done by Michael Webster, a fish ecologist who received his doctorate from OSU. As the population of prey diminishes, the native predators often move on to other areas where, literally, the fishing is better.

The new research concludes that lionfish, by comparison, appear to stay in one area even as the numbers of prey diminish, and in some cases can eat the population to local extinction. They have unique characteristics that make this possible, and like the terminator, they simply will not stop until the last of their prey is dead.

"Lionfish seem to be the ultimate invader," said Ingeman, a doctoral candidate in the Department of Integrative Biology within the OSU College of Science. "Almost every new thing we learn about them is some characteristic that makes them a more formidable predator. And it's now clear they will hunt successfully even when only a few fish are present. This behavior is unusual and alarming."

This research was conducted on replicated natural reefs in the Bahamas, measuring prey mortality of the fairy basslet a popular aquarium fish and a common prey of lionfish.

Predation rates were compared between reefs with the invasive lionfish and reefs with native predators alone, and across a ra
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Contact: Kurt Ingeman
ingemank@science.oregonstate.edu
541-908-0805
Oregon State University
Source:Eurekalert  

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