Bull sharks naturally inhabit many estuarine and river system throughout their range. "In recent years there have been several other fatal bull shark attacks on Australia's east coast.". DON’T be alarmed but be aware of the risks – that’s the message from authorities amid a spate of bull shark sightings in the Swan and Canning rivers. Dr Molony said bull sharks in WA were smaller than those found elsewhere. "Bull sharks naturally inhabit many estuarine and river system throughout their range. "We do not have data to confirm that full grown bull sharks have entered the system, however, from what is understood about the biology of the species, juveniles are likely born within the river and have been known to remain in estuarine and river systems for up to five years," Dr Molony said. “Treat it like going to the beach … there are sharks in all waters, just be aware,” he said. “Treat it like going to the beach … there are sharks in all waters, just be aware,” he said. Despite their reputation, only one person – a young boy in the 1920s - has been killed in the Swan and Canning River system in recorded history. Despite their reputation, only one person – a young boy in the 1920s - has been killed in the Swan and Canning River system in recorded history. It was rare to catch them and they were often mistaken for whaler sharks, which look similar.
Perth man Robin Morritt filmed a close encounter with a sandbar shark in the Swan River near the Royal Perth Yacht Club. Unlike bull sharks, dolphins are air breathers. File image. Dolphin and bull shark sightings are relatively common in the Swan River, and there is also a historic report of a fatal shark attack in Perth’s main waterway. From December to January, there were 11 unverified bull shark sightings reported on the State Government’s SharkSmart website, as far upstream as Bassendean. Get your bonus Spin to Win codeword on The West! But the Department of Fisheries says an increase in sightings during summer is nothing out of the ordinary. First dorsal fin comes to a point and is not curved backwards. There have been a spate of bull shark sightings in Perth’s rivers in recent weeks. In March, Perth man Robin Morritt, 61, filmed a close encounter with a sandbar shark just metres from the Swan River shore at Matilda Bay. Dr Molony said it was likely other species of sharks spend time in the river, but sightings are rare and unconfirmed. Bull sharks are one of three species deemed dangerous by the government, along with white and tiger sharks. "Along with the great white and tiger sharks, the bull shark has a reputation for being dangerous," the Trust's website states. “If you see a shark, that’s good enough, no matter what type it is – report it.”. Timeline of unprovoked incidents since 1900.
Murdoch University fish ecologist Dr Fiona Valesini said that since 2007, seven juvenile bull sharks had been accidentally discovered in the river by researchers studying other species, but the data is not robust enough to determine population size. The bull sharks are usually found in deeper waters between South Perth and Maylands and they mate and give birth in late spring and early summer.
It is the only species of shark to spend long periods of time in fresh water.
Dr Molony said bull sharks were residents in the Swan and Canning system because as a species they spent much of their life in rivers and estuaries, while sightings of them in local coastal waters were much rarer. In January PerthNow reported a spate of bull shark sightings in the Swan and Canning River systems. Some who responded believed it was a dolphin. All three may be visible on the surface of the water. Shark attack data for Western Australia, Australia. A 1.1m bull shark caught in the Swan River in 2011.
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