New research which could help conserve sharks has confirmed that many of the ocean predators are probably completely colour blind.
The joint study by The Universities of Western Australia (UWA) and Queensland looked at the visual adaptations of two species of wobbegong sharks, which are also known as carpet sharks.
Wobbegongs spend most of their time on the sea floor and hunt mostly at night using an unusual sit-and-wait ambush strategy, the journal The Royal Society's Biology Letters reports.
Scientists say the market for shark fin soup is the likeliest reason for the sharp drop in blue shark numbers over the last 30 years.
They discovered that the sharks feed in exactly the same places in the ocean that long-line fishing boats operate, which means they get caught along with other target fish.
The researchers add that such regions are ideal places to implement so-called marine protected areas, where fishing is banned, to safeguard blue sharks and other vulnerable species.
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