<div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>The current weather conditions are brewing up a perfect storm for not one but two species of shark in the water off </span><a href="https://www.9news.com.au/sydney" rel="" target="_blank" title="Sydney's"><span>Sydney's</span></a><span> beaches.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Shark expert Dr Chris Pepin-Neff told Today that the combined factors of recent rain and sea temperatures mean both bull sharks and great whites are being lured closer to shore.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Pepin-Neff said sea surface temperatures of 20 degrees and above were ideal for bull sharks, while 20 degrees and below was perfect for great whites.</span></div></div><div><div id="adspot-mobile-medium"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>LIVE UPDATES:</span></strong><span> </span><a href="https://www.9news.com.au/world/us-israel-iran-war-live-updates-may-21-donald-trump-latest-world-news-headlines/525613a3-c84c-4e08-8d87-94949382211a" rel="" target="_blank" title=""><strong><span>'Whatever I want': Trump's stunning Israel claim</span></strong></a><strong><span></span></strong></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>And right now, "we're right in the middle".</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"It's the end of May, we're right at that seasonal point," he said.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Added to that, recent heavy rain had stirred up brackish water closer to the shore, which also made ideal hunting conditions for bull sharks.</span></div></div><div><div class="OUTBRAIN" data-reactroot="" data-src="//www.9news.com.au/national/shark-warning-sydney-beaches-great-whites-bull-sharks/c8258837-91b3-400e-9335-17c347f7633b" data-widget-id="AR_5"></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE:</span></strong><span> </span><a href="https://www.9news.com.au/national/bondi-beach-terror-attack-man-charged-with-stealing-victims-camera-equipment/3afc712c-b88d-459f-8ca9-e628b147103e" rel="" target="_blank" title=""><strong><span>Man charged with stealing Bondi terror attack victim's camera</span></strong></a><strong><span></span></strong></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>And great whites were being drawn in closer by the cooling temperatures.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>"I want surfers to be aware if you're in the Northern Beaches, if you're doing surfing right now, white sharks are in closer," Pepin-Neff said.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>He urged surfers to stick together in groups in the water for safety's sake.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Other swimmers were told to stay out of brackish water, and if they were swimming at an ocean beach, to stay between the flags.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><span>READ MORE:</span></strong><span> </span><a href="https://www.9news.com.au/national/melissa-caddick-con-woman-victims-share-small-pot-final-cash/eba54293-a47c-4d12-9e82-10dbffea4a6d" rel="" target="_blank" title=""><strong><span>Con-woman Melissa Caddick's victims share 'small pot' last cash</span></strong></a><strong><span></span></strong></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Pepin-Neff said the noise generated in the water by a group of people could intimidate sharks and keep them at a distance, so there's safety in concentrated numbers.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Sydney recently saw a spate of attacks believed to have been carried out by bull sharks, in January this year.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><span>Among the victims was </span><a href="https://www.9news.com.au/national/shark-attack-victim-nico-antic-dies-in-hospital-12-dies-in-hospital/197eb532-ac6e-43ca-8532-29dbaee8c831" rel="" target="_blank" title="12-year-old Nico Antic"><span>12-year-old Nico Antic</span></a><span>, who was fatally mauled and died in hospital.</span></div></div><div class="block-content"><div class="styles__Container-sc-1ylecsg-0 goULFa"><strong><em><span>NEVER MISS A STORY:</span></em></strong><span> </span><em><span>Get your breaking news and 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