A shark expert has issued an urgent warning as heavy rains create “perfect” conditions for the apex predator to lurk along our shorelines.Joel Nancarrow, owner of shark taxidermy business Hunter Shark Jaw Restoration, said recent downpours in New South Wales, an incoming strong westerly wind and the migration of mullet north from estuary systems in Sydney “unfortunately lined up with the time the bull sharks will also be looking to head north”.In a recent Facebook post, the shark enthusiast said the current conditions were similar to those seen in January.“Just like we had in January, the conditions are perfect for the sharks to be along the beaches,” he said.“They will likely stop once they reach the good water around [Port Macquarie]/South West Rocks. This will mean large quantities of bull sharks in these areas for at least three weeks yet.“The next week is a real danger period along the beaches. Take care and just keep an eye out.” NSW authorities also issued a warning via the SharkSmart app yesterday. It urged eager beachgoers to be wary of waterways following the recent heavy rain.“Rain along the NSW coast over the past 24–48 hours has changed beach and estuary conditions,” the post warned.“The widespread inland rain and lighter to heavy rainfalls along much of the NSW coast – particularly northern NSW. Freshwater and nutrient‑rich run‑off can reduce visibility, affect water quality and attract baitfish — sometimes increasing shark activity.”It urged people to avoid swimming in murky or dirty waters and to take extra care within 1km of a river, river mouth or harbour, especially after rain or flooding. It also warned to be cautious if watergoers spot baitfish, diving birds or dolphins and to avoid areas where there is recreational or commercial fishing taking place.They urged anyone hitting the water to “buddy up” with someone.It comes after a spearfisherman was fatally attacked by a white shark off Rottnest Island.Steven Mattaboni, 38, was swimming back to his boat at Horseshoe Reef, about one kilometre offshore from the island, when a four-metre shark attacked.His friends rushed over to help Mr Mattaboni and rushed him to nearby Geordie Bay for medical attention, but he could not be saved.The 38-year-old victim was a father of two and lived in Perth’s northern suburbs.In a heartbreaking statement, his wife Shirene said her husband was a generous and loving father to their two daughters, aged two and four months.“Our hearts are irrevocably broken by the loss of Steven, known affectionately to his mates as ‘Mattas’,” she said in a statement.“An avid fisherman and spearfisherman, who lived and breathed the ocean, he was always in tune with the sea.“He was fiercely loyal, endlessly generous, and the kind of man who would give you the shirt off his back.“The world has lost a truly one-of-a-kind gentleman, and our daughters have lost an incredible father far too soon.”