Published On: Tue, Jan 17th, 2012

World’s first hybrid sharks found in Australia

Researchers have discovered the world’s first hybrid sharks in Australian waters, indicating that animals are adapting to climate change for survival.

Leading researchers in marine biology have come across 57 animals along a 2,000-km stretch from Queensland to New South Wales which they believe are the result of cross-breeding between the common blacktip shark and Australian blacktip shark, two related but genetically distinct species.

The inter-breeding between the two species shows that the animals are adapting to climate change and the hybridisation can make the fishes stronger, the scientists said.

“Hybridisation can enable sharks to adapt to ecological change as the smaller Australian blacktip currently favours tropical waters in the north while the larger common blacktip is more abundant in sub-tropical and temperate waters along the south-eastern Australian coastline,” Jennifer Ovenden of Queensland Department of Primary Industries and Fisheries was quoted as saying by the Herald Sun.

“Wild hybrids are usually hard to find, so detecting them and their offspring is extraordinary. To find 57 hybrids along 2000-km of coastline is unprecedented,” she said.

Another researcher at the University of Queensland researcher, Jess Morgan, said it was unusual for sharks to breed in such a way.

She said as sharks physically mate, it makes sure they do not hybridise with the wrong species.

The find was made during cataloguing work off Australia’s east coast when genetic testing showed certain sharks to be one species when physically they looked to be another.

Colin Simpfendorfer of James Cook University’s Fishing and Fisheries Research Centre, said the results of this research show that we still have a lot to learn about these important ocean predators.

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