Is algae naturally occurring in the Swan River?

The Swan River has hundreds of naturally occurring microscopic algae species (known collectively as phytoplankton) most of which are not harmful to humans or animals. River where the water was relatively clear, calm and warm.

What causes algal blooms in rivers?

Drought, water extraction for irrigation, human and stock consumption and the regulation of rivers by weirs and dams all contribute to decreased flows of water in our river systems. Water moves more slowly or becomes ponded, which encourages the growth of algae.

What species of algae are found in the Swan River?

The most common macroalgal species found in the Swan-Canning estuary is Gracilaria comosa, a red alga. It can often accumulate above shallow, soft muddy sediments in sheltered embayments.

What time of year do algal blooms occur?

Harmful algae usually bloom during the warm summer season or when water temperatures are warmer than usual. Warmer water due to climate change might favor harmful algae in a number of ways: Toxic blue-green algae prefer warmer water.

Can you eat fish from the Swan River?

Over the course of the bloom, the Department of Health advised the public not to fish for or consume fish, crabs or shellfish from the affected Swan River areas. Public health warning signs were erected by local government authorities at key Swan and Canning river jetties, boat ramps and popular fishing locations.

Why are algae blooms bad?

Under the right conditions, algae may grow out of control — and a few of these “blooms” produce toxins that can kill fish, mammals and birds, and may cause human illness or even death in extreme cases. Collectively, these events are called harmful algal blooms, or HABs.

Is swimming in algae bad for you?

Whether mild or severe, it isn’t recommended. Significant amounts of swimming pool algae welcome a breeding ground of harmful bacteria that feed on algae. These bacteria pose health risks to swimmers, most commonly resulting in a skin rash. It can also cause various bacterial infections of the ears or eyes.

Are Swan River crabs safe to eat?

The Department of Health continues to advise people not to eat fish, crabs or shellfish collected from within the Swan River, extending from Pelican Point to Como Jetty and upstream to Tonkin Highway Bridge.

Can you swim in algae bloom?

If you see a bloom, stay out of the water and keep your pets and livestock out of the water. You cannot tell if a bloom is harmful by looking at it, so it is best to use caution and stay away. Do not fish, swim, boat, or play water sports in areas where there is harmful algae or cyanobacteria.

Are there sharks in the Swan River?

“The bull sharks in the Swan River are almost all juveniles, usually less than one metre in length and present very little threat to humans. “At that size, those sharks are generally much more afraid of people than people should be of them. “It is very rare that a large individual is found in the river.”

Is it safe to swim in Swan River Perth?

However, water quality is generally safe for swimming. Poor or Very Poor: Bacterial water quality is often unsatisfactory for swimming. Avoid swimming at this location.

Are there algal blooms in the Swan and Canning Rivers?

What is Alexandrium? Alexandrium is a group of microalgae that has been previously detected at elevated levels in the Swan and Canning rivers. It has impacted waterways and fisheries around the globe, and is expected to be an annual occurrence in the Swan and Canning rivers.

How does Alexandrium affect the Swan and Canning Rivers?

Alexandrium is a group of microalgae that has been previously detected at elevated levels in the Swan and Canning rivers. It has impacted waterways and fisheries around the globe, and is expected to be an annual occurrence in the Swan and Canning rivers. These algae can produce Paralytic Shellfish Toxins (PSTs) that can impact mussels and crabs.

When did aalgal bloom in the sswan Canning estuary?

AAlgal blooms in the lgal blooms in the SSwan-Canning estuary: wan-Canning estuary: PPatterns, causes and history a te rn s, c u d hi o y Issue 3, February 2005 3 River Science February 2005

Is it safe to swim in the Swan River?

It is also safe for dogs to swim in the water. The public is advised to pay attention to algal bloom caution and public health warning signs displayed in the Swan Canning Riverpark and to watch out for Alexandrium updates in the media. How can I find more information?