All three may be visible on the surface of the water. In January PerthNow reported a spate of bull shark sightings in the Swan and Canning River systems. ". 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. Head is short and comes to a point in profile, but is blunt and broad when seen from above and below. "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. But the Department of Fisheries says an increase in sightings during summer is nothing out of the ordinary. It is the only species of shark to spend long periods of time in fresh water. The juvenile shark, estimated to be 1.5 metres long, was swimming near the Royal Perth Yacht Club. The species is widespread through tropical and warm calm waters worldwide and are found in Australia from Perth, across the northern coast, and down the east coast as far as Sydney. 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. 'Dangerous' bull sharks use the Swan River as a nursing ground, travelling into the upper reaches of the system and growing to more than a metre in length, scientists say. From December to January, there were 11 unverified bull shark sightings reported on the State Government’s SharkSmart website, as far upstream as Bassendean. 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. Unprovoked counts There have been a spate of bull shark sightings in Perth’s rivers in recent weeks. WA Department of Fisheries supervising scientist Dr Brett Molony said bull sharks enter the safe, calm waters of the river system to give birth. Surf Life Saving WA received a report from a member of the public of a “2.5 metre white shark” was swimming near the Nedlands Yacht Club about 12.30pm. Some who responded believed it was a dolphin. 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. They are a normal component of the Swan River system. The Eliza statue, in the Swan River after Aussie Cadel Evans won the Tour de France in 2011. But Dr Molony being incident-free for so long did not mean a shark attack in the river would never happen again. Bull sharks naturally inhabit many estuarine and river system throughout their range.

But the Department of Fisheries says an increase in sightings this time of year is nothing out of the ordinary. Since the beginning of last month, 11 unverified bull shark sighting have been reported on the State Government’s SharkSmart website, as far upstream as Bassendean. 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. The most common form of shark attack is a hit-and-run attack, where the shark bites once and then disappears, often in murky water or breaking surf near shore. A 1.1m bull shark caught in the Swan River in 2011. 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. “Treat it like going to the beach … there are sharks in all waters, just be aware,” he said. 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. One river user posted footage on Facebook late last month, claiming it was of a 2m bull shark he saw from a distance in the Canning River while fishing for bream. A LARGE shark was sighted in the Swan River on Thursday, with reports that the 2.5 metre predator came within 15 metres of the shore in Nedlands. File image. There has been one fatality in the Swan Canning Riverpark when a young boy was attacked in the lower estuary during the 1920’s(4). Bull sharks are aggressive and can be deadly, with the species believed responsible for the majority of shark attacks in Sydney Harbour. A 13-year-old Scotch College student was attacked and killed when he was swimming near the college boatshed in January 1923. Have a rounded head with a distinct nose/muzzle. © West Australian Newspapers Limited 2020. Perth man Robin Morritt filmed a close encounter with a sandbar shark in the Swan River near the Royal Perth Yacht Club. Shark attack data for Western Australia, Australia. They are a normal component of the Swan River system.

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