Swimmers in Melbourne are being warned to avoid the water if they spot red jellyfish. Recently, thousands of lion’s mane jellyfish have washed ashore in Port Phillip Bay, stretching from Altona to Blairgowrie.
Neil Blake, the Port Phillip Baykeeper, said this kind of jellyfish bloom is unusual, occurring only once every few years. This surge follows a similar event with bluebottles that hit Victorian beaches last December. The jellyfish are usually around the size of a peach, with long tentacles that can reach up to a meter or more.
Jellyfish sightings can be alarming, but they are a normal part of the season. The Bayside City Council noted that while these jellyfish are fascinating, they can also sting. Thus, beachgoers should exercise caution, especially young children and those with allergies.
Experts recommend avoiding swimming in areas where jellyfish are visible. If you do get stung, rinse the affected area with seawater, remove any tentacles, and seek medical help if necessary.
Dr. Jonathan Lawley, a jellyfish specialist, explained that lion’s mane jellyfish are not skilled at swimming. They drift with currents and tides, which is why we see them washed up in large numbers. The jellyfish lifecycle includes a stage where larvae lie on the seafloor until conditions prompt them to multiply.
Interestingly, while some worry that climate change is causing more jellyfish blooms, research suggests mixed impacts on different species. Some jellyfish might thrive due to warming waters, while others may struggle.
Jellyfish play vital roles in ocean ecosystems. Their presence can provide shelter for smaller fish, helping maintain the balance in the food web. While the current jellyfish influx can seem daunting, it’s also a reminder of the complex interactions in marine environments.
For more on jellyfish and their role in marine ecosystems, you can check out this study from the University of Sydney.
