Two decades after the United Nations first demanded urgent safeguards, international negotiations may finally deliver comprehensive protections for delicate deep-sea mountain ecosystems ravaged by commercial bottom trawling fleets.
Undersea mountains, or seamounts, rise thousands of metres from the abyssal plain to form biological oases teeming with endemic marine life. Yet for decades, heavy industrial fishing gear dragged along the seabed has reduced centuries-old coral gardens and sponge fields to rubble. As reported by The Conversation AU, international momentum is finally consolidating around meaningful prohibitions on bottom trawling across these critical underwater features, twenty years after the global body initially sounded the alarm.
Decades of delay over benthic destruction
The United Nations General Assembly first called for action to shield vulnerable marine ecosystems from destructive fishing practices in 2004. However, progress has long been stymied by fragmented governance regimes, regional fisheries management organisations dominated by industry interests, and an absence of binding legal enforcement mechanisms on the high seas.
Industrial bottom trawlers deploy heavily weighted gear that scrapes across the summits and flanks of seamounts to harvest commercially valuable species, including orange roughy and alfonsino. The process indiscriminately crushes slow-growing benthic structures. The Conversation AU reported that despite two decades of diplomatic rhetoric, vast swathes of international waters have remained open to industrial extraction, allowing heavy nets to continue pulverising ecologically irreplaceable habitats.
Ancient corals flattened in international waters
Seamounts act as vital ecological hubs in the open ocean, disrupting deep currents to drive upwellings of nutrient-rich water. This phenomenon supports dense aggregations of marine life, ranging from ancient cold-water corals and glass sponges to pelagic predators such as tuna, billfish, sharks, and migrating cetaceans.
Scientific surveys have repeatedly demonstrated that deep-sea benthic organisms possess extreme longevity and fragile life histories, with some black coral colonies inhabiting seamounts estimated to be thousands of years old. When trawlers sweep through these topographies, complex communities established over millennia are flattened in a matter of hours, creating marine barrens that show negligible signs of recovery even decades after fishing ceases.
Treaty momentum meets commercial pushback
The renewed prospect of decisive intervention stems from recent shifts in ocean diplomacy, most notably the adoption of the High Seas Treaty—formally known as the Biodiversity Beyond National Jurisdiction agreement. The landmark accord establishes a framework to designate high-seas marine protected areas, potentially bypassing the sluggish consensus-driven regional bodies that have historically shielded distant-water fishing fleets.
Conservation advocates argue that barring bottom-contact gear on seamounts represents an urgent litmus test for international environmental governance. Nevertheless, reform proposals continue to face persistent resistance from distant-water fishing nations, which argue that existing regional arrangements are sufficient and caution against blanket bans on valuable high-seas fisheries.
Australia's stake in high-seas stewardship
For Australia, the fate of seamount ecosystems carries domestic resonance. The nation manages extensive marine parks, including protected seamount clusters off the Tasmanian coast, where historical trawling inflicted severe scars on deep-sea reefs before spatial closures were introduced.
Domestic fisheries science has shown that while spatial closures require regulatory resolve, they remain the only viable strategy to halt irreversible biodiversity loss. With the international community moving toward formal ratification of new ocean protections, global attention is turning to whether multilateral bodies will finally muster the political will to enforce bans on the ocean's most vulnerable peaks.
