Sharks Stun Sardine Prey With Tail Slaps
Thresher sharks hunt sardines by rapidly slapping their tails hard enough to stun or kill several of the smaller fish at once.
Asian Scientist (Jul. 12, 2013) - Thresher sharks hunt schooling sardines in the waters off a small coral island in the Philippines by rapidly slapping their tails hard enough to stun or kill several of the smaller fish at once.
This behavior was observed by researchers working on the Thresher Shark Research and Conservation Project who tracked shark activity with handheld video cameras.
In their study, published in PLOS ONE, the researchers analyzed 25 instances of tail-slapping to stun prey.
Sharks seemed to initiate the behavior by drawing their pectoral fins inward to lift their posteriors rapidly, followed by tail-slapping forceful enough to stun or kill several prey, and even cause dissolved gases to bubble out of the water. After a successful hunting event, sharks ate an average of 3.5 sardines.
For large marine predators, being able to stun more than one prey at a time is likely to be a more efficient means to hunt than chasing after many small fish in a school. Dolphins and killer whales are known to use tail-slaps to control or stun prey, while humpback and sperm whales use tail-slaps to communicate over long distances.
"This extraordinary story highlights the diversity of shark hunting strategies in an ocean where top predators are forced to adapt to the complex evasion behaviors of their ever declining prey," said Dr Simon Oliver, the study's lead investigator.
The article can be found at: Oliver et al. (2013) Thresher Sharks Use Tail-Slaps As A Hunting Strategy.
Source: PLOS. Photo: Maxime Guilbot/Flickr.
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