Shark behaviour could be influenced by the moon, water temperature and time of day, a study sais. Source: AAP
THE diving behaviour of sharks could be influenced by the moon, water temperature and time of day, new research has revealed.
A study of about 40 grey reef sharks - commonly found on coral reefs in northern Australia and in the Indo-Pacific - found they stayed in deep water during a full moon and moved to shallow water with the new moon.
The sharks were tagged near Palau, east of the Philippines, and followed for two years using acoustic telemetry.
The group of mostly adult females were recorded diving to an average depth of 35m in winter and 60m in spring.
In winter, when deeper waters were colder, the sharks remained closer to the surface where the water was warmer, but moved around to a range of depths in summer.
Researchers suggest that because sharks are cold blooded, they may prefer warmer water to conserve their energy.
The research also found that the time of day could affect how deeply sharks dive.
"We were surprised to see sharks going progressively deeper during the morning and the exact inverse pattern in the afternoon, gradually rising towards the surface," researcher Gabriel Vianna said.
"This matches how light changes on the reef during the day.
"To our knowledge, this is the first time such patterns have been observed in detail for reef sharks."
The study was conducted by scientists from the University of Western Australia's Oceans Institute and the Australian Institute of Marine Science.
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