Fish

As sharks, rays, and other marine life continue to wash up on South Australian beaches, citizen scientists are urged to record the scale of the lingering marine algal bloom event.

Despite recent environmental and animal welfare concerns, supporters of Tasmania's salmon industry say it provides critical economic benefits to regional communities.

A new study has found mud crabs actually have complex lives. From long distance travel, to carving up food for little fish, these Easter lunch favourites might surprise you. 

New footage filmed 600 metres below the surface of the Southern Atlantic Ocean shows rare juvenile from world's heaviest squid species.

Squeezed from the skin of a stonefish, a recently discovered toxin shows enormous promise, according to researchers in Far North Queensland.

Four kilometres below the surface of the Tasman Sea is a strange world inhabited by even stranger creatures. In its autumn voyage, the CSIRO's Research Vessel Investigator took a closer look.

Residents say they have seen fish and other marine life washed ashore in the days since a large-scale toxic algae bloom and fish kill at Fleurieu Peninsula beaches.

Sharks were thought to be silent, but scientists have recorded a New Zealand species making a clicking noise.

A microalgae "toxic to fish but not humans" has been identified as the cause of a bloom linked to octopus and other marine deaths along SA beaches, with environment authorities saying the algae has flourished "marine heatwave" and "warmer-than-usual" sea temperatures.

Rarely found in the Southern Ocean, a 2.5-metre sunfish washed up on WA's Lowlands Beach between Denmark and Albany could be a sign of a warm current moving south, a marine ecologist says.

Similar seawater quality problems to those that have been reported near Victor Harbor are threatening the livelihood of a fisher in the state's south-east.

Thousands of small fish have washed up on beaches all along the NSW south coast and experts don't know why.

Federal Labor will push through legislation next week which could derail a legal battle over salmon farming's impact on an endangered ray and safeguard the industry's future in Tasmania.

Without the help, native freshwater fish like bream, pike and bass can become backed up behind the lock and form easy prey for predators in the spring, when the lock is rarely opened for passing boats.

The serendipitous discovery of an exquisitely preserved fossil near Gulgong in NSW provides a glimpse into the evolution of Australian fish around 15 million years ago when the area was a tropical lake.

Dead octopuses have been found along South Australian beaches as environment authorities say a microalgae bloom could be to blame for fish deaths on the weekend.

Thousands of dead fish and other aquatic animals have washed ashore across the NSW Northern Rivers as floodwaters surge through the catchment.

An investigation is underway into fish deaths and a mysterious foam on a South Australian beach, with several people reportedly falling ill after visiting the area. Two beaches have now been closed by authorities. 

Hundreds of fish/mullet were found dead last week on the banks of Lake Macquarie. EPA investigations reveal it was likely a natural event. Source: ABC Archives, Sep 2022

The NSW EPA said it was the sight and stench of dead fish, and not machinery sensors, that prompted their investigation that landed a power station company in court.