The Australian lungfish has a bigger brain than you might think.
To understand how some creatures evolved, you need to see how their brain developed over millions of years. That's now possible thanks to some clever use of scanning technology.
How many species of frog are in the picture? Genetics often says ‘more than we thought’.
Michael Lee (Flinders University & South Australian Museum)
The Earth is full of many varied species from the largest mammals to the tiniest organisms. But we now think there could be ten times more species than was originally thought.
Spangled perch are one of Australia’s strongly migratory native fish. After storms in January 2015 these fish were actively travelling up a flooded road in outback Northern Territory.
Freshwater fish are declining everywhere, in part thanks to dam-building. But we can have both.
Unlike clownfish (Nemo), Pacific blue tang fish (Dory) cannot be bred in captivity.
The release of the movie 'Finding Dory' comes with renewed calls to leave fish in reefs – a good idea in this case – but catching some ornamental fish can have a positive impact on reef communities.
Nemo is actually a ‘false clownfish’.
The recent severe bleaching on the Great Barrier Reef has also affected anemones, which provide homes for clownfish.
Goldfish might look nice, but they can also spread a variety of decidedly not-nice viruses.
Many pet fish end up in ponds, fountains and waterways. But before ditching your goldfish in the park, stop and think about the viruses you could also be releasing.
If these fish were released from farms, they might be hard of hearing.
Farmed fish have a high rate of a deformity that hampers their hearing, and this can be a problem if they're released into the wild.
This 119 million year old fish,
Rhacolepis, is the first fossil to show a 3D preserved heart which gives us a rare window into the early evolution of one of our body’s most important organs.
Dr John Maisey, American Museum of Natural History in New York
For centuries, the fossil remains of back-boned animals were studied primarily from their hardened bones. Now palaeontologists can study the softer side of these ancient creatures.
Bleached coral can take on luminously beautiful pink and purple hues - but don’t be deceived, these corals are under stress.
The bleaching hitting the Great Barrier Reef not only harms corals. As these close-up photos show, it also deprives many other species of a home and livelihood.
Don't confuse studies doubting some of the benefits with the bigger picture.
Filter-feeding fish have had 150 million years to improve filtration.
Rob Holm / USFWS
Even the best engineered filters get clogged eventually. Fish mouths have evolved structures that create unique fluid dynamics patterns that solve that problem.
Plastic fragments found in dissected fish.
Algalita Marine Research and Education
Dave West from the environmental group Boomerang Alliance told Fairfax that if you've got an average seafood diet in Australia, you're probably ingesting about 11,000 plastic pieces a year. Is that right?
New research shows fish are more similar to complex animals like humans and other mammals than we previously thought.
The remote rivers of northern Australia could be home to untold numbers of new and threatened fish.
Matthew Le Feuvre
A score of new fish species discovered recently in northern Australia remind us how little we know about our country.
Scuba diving must be done in a sustainable manner to preserve the industry.
Africa has a number of excellent scuba diving sites, but these must be maintained sustainably to keep attracting different divers.
The genetically modified salmon (rear) grows twice as fast as a non-GM fish.
The US food authority may have approved GM salmon for our consumption, but it may take time before any appear in our stores.
Fishermen rescued from a boat on which they were trafficked to work.
There are no proper laws to combat fisheries crime. As a result, a number of organisations need to join forces to stop the problem.
Satellite-tagged eels, ready for release.
Martin Castonguay, DFO
Much of what we know about these elusive eels' life cycle has been based on circumstantial evidence. Now for the first time, scientists tracked an adult eel to its distant spawning ground.
Maurice McDonald / PA Archive
A study suggests that stopping deep-sea trawling at a depth of around 600m makes sense.
Small but dangerous – and coming to the New World.
A small invasive fish known as the topmouth gudgeon has already wreaked havoc on European species and its arrival to the US and South America is only a matter of time.