The ocean covers more than 70 percent of our planet’s surface, yet we have explored less than 20 percent of it. What lies beneath the waves is a staggering tapestry of life — from microscopic phytoplankton that produce half of Earth’s oxygen, to the blue whale, the largest animal ever to have lived. Marine biodiversity is not just fascinating —…
Kelp Forests: The Ocean’s Towering Giants
Rising from the seafloor like underwater skyscrapers, kelp forests are among the most productive and dynamic ecosystems on Earth. Found in cool, nutrient-rich coastal waters around the world — including along the southern coasts of Australia — these towering algal forests support extraordinary biodiversity and provide vital services to both marine life and human communities. What Is Kelp? Kelp is…
Seagrass Meadows: The Unsung Heroes of Coastal Ecosystems
They may not have the visual drama of coral reefs or the towering grandeur of kelp forests, but seagrass meadows are among the most ecologically and economically important habitats in the ocean. Found in shallow coastal waters on every continent except Antarctica, these flowering plants — true plants, not algae — provide a suite of ecosystem services that rival any…
What Is Sustainable Aquaculture and Why Does It Matter?
As the global population grows and wild fish stocks come under increasing pressure, aquaculture — the farming of fish, shellfish, seaweed, and other aquatic organisms — has become an indispensable part of the world’s food system. But not all aquaculture is created equal. Sustainable aquaculture aims to meet the world’s growing demand for seafood while minimising environmental impact, supporting local…
Oyster Farming in Australia: A Model for Sustainable Seafood Production
Few aquaculture industries can claim the combination of ecological benefit, cultural heritage, and economic value that oyster farming brings to Australian coastal communities. From the estuaries of New South Wales to the bays of Tasmania and South Australia, oyster farming is a cornerstone of sustainable seafood production — and a compelling example of how aquaculture can work with nature rather…
Seaweed Farming: The Future of Sustainable Ocean Agriculture
Among the most promising developments in sustainable food production is the rise of seaweed farming. Fast-growing, requiring no freshwater or fertiliser, capable of absorbing carbon dioxide and improving local water quality, and richly nutritious — seaweed is attracting attention from scientists, entrepreneurs, and policymakers around the world as a cornerstone of a future sustainable food system. What We Mean by…
Microplastics in the Ocean: What We Know and What We Can Do
They are invisible to the naked eye, present in every ocean on Earth, and accumulating in the tissues of marine organisms from plankton to whales. Microplastics — plastic fragments smaller than five millimetres — have become one of the defining environmental challenges of our era. Understanding their sources, behaviour, and impacts is the first step toward meaningful action. Where Do…
Ocean Acidification: The Other CO2 Problem
When we think about the impacts of rising carbon dioxide emissions, we often think of warming temperatures and changing weather patterns. But the ocean’s role as a carbon sink — absorbing roughly 30 percent of all CO2 emitted by human activity — has a profound and often underappreciated consequence: ocean acidification. As the ocean absorbs more CO2, it becomes chemically…
Nutrient Pollution and Dead Zones: When Too Much of a Good Thing Becomes a Crisis
Nutrients are essential for all life in the ocean. Nitrogen and phosphorus fuel the growth of phytoplankton that form the base of marine food webs, producing the oxygen we breathe and supporting fisheries that feed billions. But when nutrient levels in coastal waters are artificially elevated through human activity, the consequences can be catastrophic — triggering algal blooms, depleting oxygen,…
Coral Bleaching: Understanding the Crisis Facing the World’s Reefs
Coral bleaching has moved from an occasional anomaly to a near-annual reality across much of the tropical world. The Great Barrier Reef — Australia’s most iconic marine ecosystem and one of the most biodiverse places on Earth — has experienced mass bleaching events of unprecedented frequency and severity. Understanding what coral bleaching is, why it happens, and what it means…