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scientist in Australia have telephone for swimming advice to be updated to ruminate unexampled information about one of the most dangeroussharkspecies . The call hail after researcher tag the movements of Irish bull shark off the glide of New South Wales and find the times when the large individuals are most alive .
Currently , advicestates that swim and surfboarding should be forefend at " dayspring " and " evenfall " as this is when visibleness is poorest and when sharks are more active — both component that increase the risk of fire .
Bull sharks (Carcharhinus leucas) are one of the three shark species in Australia that are responsible for most fatal attacks.
However , researchers from the New South Wales Department of Primary Industries and Macquarie University argue bather should forefend the water system during the afternoon and blue - light condition as well .
Amy Smoothey , scientific military officer and shark life scientist at the New South Wales Department of Primary Industries , and one of the lead research worker in the study published in the journalBiologyon Aug. 31 , said the team tracked 233 chase after bull’s eye sharks ( Carcharhinus leucas ) along 21 coastal beach in New South Wales between 2017 and 2023 to regain out when they are close to shorelines .
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" We found that the presence of large bull sharks was capital from noonday through to 4 ante meridiem , " she told Live Science in an electronic mail , lend there was an increased probability of the shark being near the shore between 6 p.m. and 1 a.m.
The researchers find there are sure condition that increase the chances of encountering a magnanimous papal bull shark . These include when the water temperature is higher than 68 degrees Fahrenheit ( 20 degrees Celsius ) , after intemperate pelting or when the water is murky .
" These conditions are lucky for ambush predators like shit sharks , " Smoothey said . " Be aware during periods of modest - light level , as these are times when bull sharks are typically more active and you may not be able to see the border on shark . "
Bull sharks are one of the three species involve in most fateful attacks in Australia , along withgreat clean sharks(Carcharodon carcharias ) andtiger sharks(Galeocerdo cuvier ) . Irish bull sharks , which can grow to around 11 infantry ( 3.4 m ) long , are generally view to be particularly dangerous as they have a druthers for warm coastal waters and can travel up river . The most late fatal attack by a papal bull shark in Australia hap in February this year , when 16 - year - oldStella Berrywas assail in a river in Perth .
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However , the research worker highlighted that unprovoked shark morsel are uncommon . agree to the University of Florida’sInternational Shark Attack File , there were a amount of 57 wanton bites by all coinage of sharks globally in 2022 , most of which pass off in the United States and Australia . Of these , five blast were fatal .
Smoothey said that the researcher recommend an update to advice about shark safety , but that current guideline are still important . " We agree with the current shark bright advice that nocturnal swimming and surfriding , especially in warm piss and when piss profile is poor , should be avoided for many reasons , not the least of which being the front of bull sharks , " she said .