Warmer Waters in Sydney Harbour Attracting More Bull Sharks

Warmer ocean waters off the coast of NSW are leading to increased sightings of bull sharks in Sydney Harbour. Experts believe that higher sea temperatures are causing the aggressive predators to stay in the harbor for longer periods each year. The recent incident at Elizabeth Bay, where a woman was attacked and seriously injured by a suspected bull shark, highlights the potential risks associated with these warmer waters.

Bull sharks typically populate Sydney Harbour from November onwards, with females coming to give birth to their pups. The males follow suit, and together they stay until around April when they usually swim towards Queensland. However, if the water temperatures remain warm, they will continue to inhabit the harbor. The months of January and February are considered to be particularly abundant with bull sharks in Sydney Harbour.

Historical data shows that there have been a significant number of shark attacks in Sydney Harbour, with bull sharks being responsible for nearly all of them. The improved water quality in the harbor, following the closure of abattoirs and the construction of sewage outfalls, led to a decline in shark incidents. However, as the ecosystem has become healthier over the years, shark numbers have started to increase once again.

While the probability of being bitten by a shark remains extremely small, it is important to take precautions when swimming. Humane Society International Australia marine biologist Lawrence Chlebeck suggests avoiding water activities during dawn, dusk, and night. Swimming with other people, staying away from murky or dirty water, and paying attention to signs of bait fish or fish feeding activity are also advised.

The Department of Primary Industries has been actively tagging bull sharks in NSW since 2009, and at least 250 sharks have been tagged to date. Research has shown that these warm water-dwelling predators are moving further down the coast, with some even being detected as far south as Merimbula, the most southern sighting of a bull shark on the east coast of Australia. The sharks are more likely to swim close to the shore after heavy rain and can be found within 800 meters of a river mouth.

Overall, while incidents like the recent shark attack at Elizabeth Bay are rare, it is important for the public to be aware of the potential risks when swimming in Sydney Harbour. By following advice from experts and staying informed about shark activity through the SharkSmart app, individuals can take necessary precautions to ensure their safety.