The video was captured by a camera strapped on the back of a great white shark, a species that can be found in surface- and deep-waters in all major oceans and has a lifespan of 70 years or more.
"Although breaching behavior can be seen from boats and is well studied, what happens underwater is mostly unknown," lead author Yuuki Watanabe, associate professor in marine biology at the National Institute of Polar Research in Japan,"Moreover, in other aggregation sites of white sharks, including our study site in Australia, breaching behavior is rarely seen, suggesting that different hunting strategies are employed by these sharks.
Sharks attracted to the chum were tracked with a data logging package, secured to the front edge of their dorsal fin, for a period of one to two days. This package included an accelerometer to record speed, depth and water temperatures. Three of the eight sharks were also equipped with a small video camera to record activity in six-hour episodes pre-programmed to start at various intervals.
By the end of the experiment, there were 150 hours of recorded acceleration data. The recordings suggest there are seven potential predation events at depths between zero and 53 meters that took place primarily at nighttime and sometimes between dawn and dusk, the researchers say. The study also produced a shot of a shark making a beeline for a seal. The data logger shows the attack was accompanied by intensive swimming action and a rapid burst in lateral acceleration, tailbeat frequency and swim speed.
"In Japanese, we say 'seeing is worth a thousand words.' This is also the case for ecological studies of marine animals,"
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