In colonial times Australia's waters were teeming with mud oysters that provided food, cement, and cleaned the oceans. Now a 20-hectare man-made reef aims to restore some of their former glory.
The focus of food production systems, including aquaculture, must move beyond maximising yields to consider nutritional quality too.
Plant-eating fish control the spread of seaweed and algae on coral reefs. New research explaining why populations of these fish vary from site to site could lead to better reef protection strategies.
Poor management of the oceans, including the killing of crucial marine predators, could result in more greenhouse gasses.
Melanesia's oceans are worth at least US$5.4 billion, but are under increasing threat.
The simple use of a net intended to curb malaria by fishers has become a classic conservation problem.
The public and political debate about marine reserves often comes down to one thing: fishing.
The fisheries sector in West Africa is beset with serious challenges including over-fishing and, in particular, illegal fishing.
The South China Sea produces more than 10% of the world's fish – but the catch is increasingly under threat.
Crime on the ocean is not only about illegal fishing – it ranges from drug smuggling to human trafficking and modern-day slavery as well.
Was Assistant Minister for Agriculture and Water Resources Anne Ruston right to say that no solely-managed Commonwealth fishery is subject to overfishing?
Cephalopods are able to adapt rapidly to changing conditions.
The open oceans are the world's "wild west", falling outside any nation's jurisdiction. UN negotiations are aiming to draft new laws for the high seas.
While the TPP has come under attack for its environmental credentials, this controversial new trade deal offers hope in the fight against overfishing.
Fish numbers are rapidly dwindling globally, and fishery subsidies are one of the key drivers behind this decline.
A study suggests that stopping deep-sea trawling at a depth of around 600m makes sense.
Everyone knows the big heads but island's sea life is also spectacular – and unique.
Over-fishing is a massive environmental and economic challenge. Fortunately, there are new solutions being trialled – including in a tuna hotspot in the Pacific.
With their natural predators removed, sponges are free to take over coral reefs.
Flake is great with steaming hot chips. But what fish species is it, and is it sustainable? In Australia, it's mainly gummy shark, which is a sustainable choice. But beware poorly labelled imitations.