Marine Biology

Authorities have removed a dead shark that washed up on an Adelaide beach on Monday, with testing now underway to determine the cause of death.

A shark has been returned to the ocean after it became stuck in shallow waters off a South Australian beach.

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.

A school student has discovered a "very, very rare" seashell during a school holiday session at the Tasmanian Museum and Art Gallery.

Fisherman Billy Dunn has the first-edition copy of a 130-year-old book detailing the wonders of the Great Barrier Reef.

Dr Kat Bolstad explains how the footage of the colossal squid in its natural habitat of the deep ocean was captured.

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

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.

Scientists and tourists are left in awe by a rare and dramatic encounter off the state's south coast.

A conservation group in Bunbury says dorsal fin injuries that appear to have been caused by metal objects have sharply increased in the last few months.

The RSV Nuyina has been examining marine life in its research on a melting glacier, and the 60 researchers on board are making the most of the maiden research voyage.

Researchers and tourism operators are alarmed as a survey of the WA coast after an intense marine heatwave reveals "heartbreaking" levels of bleaching among centuries-old coral structures.

An expert has called for the marsupials' deaths to be investigated after previous occurrences were dismissed as being caused by a grass that can cause "staggers' in kangaroos. WARNING: This story contains content that readers may find distressing.

The NSW government is set to remove shark nets at beaches from Newcastle to Wollongong a month early this year amid growing concerns from marine advocates and experts.

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

Thousands of fish and other marine life have washed ashore across the NSW Northern Rivers as floodwaters surge towards the coast.

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.

Offshore wind faces community and political opposition as well as support for its promise of ample renewable energy and while some claims can be ruled out, experts say other concerns are valid.

Northern Beaches residents were shocked to find dead sea dragons washed up on local beaches earlier this week, and marine experts are concerned.

Researchers have found crabs are key predators of juvenile crown-of-thorns starfish and could be a hidden link to what controls their destructive spread.