Beneath the surface, a fishing net drifts slowly with the currents. No fisherman is searching for it anymore. Yet it continues its work, capturing fish, sea turtles, sharks, rays, and marine mammals. Invisible to most of us, this silent trap can remain active for several decades. These ghost nets are now considered among the most destructive threats to marine biodiversity. Every year, hundreds of thousands of tonnes of fishing gear disappear into the oceans. There, they continue fishing uncontrollably, weakening marine ecosystems across the world.
Article by Damien Lafon.
What Is a Ghost Net?
A ghost net is fishing gear that has been lost, abandoned, or discarded at sea. It may be a gillnet, trawl net, fishing line, trap, or floating rope. Although it is no longer being used, it continues capturing animals as though it were still active. This phenomenon has a name: ghost fishing. Modern fishing nets are mainly made from nylon, polyethylene, or polypropylene.
These materials are highly resistant to salt water and ultraviolet radiation. As a result, they can remain intact for several decades before gradually breaking apart. According to estimates widely cited by international organisations, almost 640,000 tonnes of fishing gear may be lost or abandoned every year. However, several recent studies suggest the actual volume could be even greater.
Did you know?
More than 700 marine species have been recorded as victims of entanglement or ingestion linked to abandoned fishing gear.
An Invisible Threat to Marine Life
Unlike pollution visible on a beach, a ghost net operates far from human eyes. When a fish becomes trapped, it quickly attracts predators. They approach to feed, but often become caught as well. Their presence then attracts more animals, creating a cycle lasting months or even years. Sea turtles are among the first victims. Some mistake floating nets for jellyfish. Others become entangled while swimming towards the surface to breathe.
Dolphins, seals, whales, and dugongs may also become wrapped in ropes and fishing lines. The resulting injuries restrict movement and make feeding increasingly difficult. In many cases, these animals die from exhaustion or drowning. Sharks and rays are also severely affected. For species already threatened by overfishing, ghost nets create another pressure that is frequently underestimated.
Coral Reefs Caught in the Trap
Carried by ocean currents, ghost nets often become entangled on coral reefs. During storms or strong swells, they repeatedly scrape against living coral colonies. This friction can destroy structures that took several decades to develop. However, the consequences extend far beyond coral destruction.
Reefs provide essential shelter for thousands of marine species. They serve as nurseries, feeding grounds, and breeding areas. When reefs disappear, the entire food chain becomes more vulnerable. Mangroves and seagrass meadows are also damaged by ghost nets. Yet these habitats are essential for many commercially important species and help protect coastlines.
Why Are Ghost Nets So Difficult to Recover?
At first glance, retrieving an abandoned fishing net may appear simple. In the field, however, the reality is very different. Some nets lie several dozen metres below the surface. Others are firmly attached to reefs or shipwrecks. Removing them requires time, experienced divers, and considerable logistical resources. In some situations, removing a net carelessly can damage the coral more than the net itself.
Specialised teams must therefore work slowly to protect these fragile habitats. Not every lost net was abandoned intentionally. Storms, powerful currents, vessel collisions, and rocky seabeds explain many losses. However, in certain regions, retrieving a net costs more than replacing it. Illegal fishing also contributes by encouraging the abandonment of unregistered equipment.
Did you know?
In some areas of the Great Pacific Garbage Patch, fishing gear represents a significant share of floating plastic debris.
Pollution That Never Truly Disappears
Over time, ghost nets begin breaking apart under sunlight, waves, and ocean currents. However, they do not truly disappear. Instead, they gradually become microplastics. These particles can be consumed by plankton, shellfish, fish, and eventually larger marine predators. Today, microplastics are found in almost every ocean on Earth. Researchers continue studying their effects on marine ecosystems and human health. This pollution therefore acts on several levels. It traps animals, destroys natural habitats, and contributes to long-term ocean contamination.
Solutions Already Exist
Despite the scale of the threat, several initiatives show that action is possible. Conservation organisations regularly coordinate recovery operations on coral reefs, in mangroves, and across the seafloor. Every net removed prevents further accidental captures. Meanwhile, some manufacturers are developing fishing gear that is easier to recycle or made from biodegradable materials.
Gear-marking systems are also improving. GPS trackers, RFID chips, and permanent identification markers help fishermen recover equipment after storms. Finally, several companies now recycle recovered nets into technical clothing, glasses, carpets, furniture, and other products. These innovations will not solve the problem alone. However, they show that better fishing gear management can significantly reduce losses at sea.
Protecting the Oceans, One Net at a Time
Ghost nets remind us that the greatest environmental threats are not always the most visible. Beneath the surface, these traps continue working day after day, far from public view. Yet their impact on marine biodiversity is immense. Reducing this pollution requires cooperation between fishermen, scientists, industries, governments, and citizens.
Every recovered net removes another trap from the ocean. Every improved design helps prevent future losses.Protecting the oceans is not only about cleaning beaches. It also means stopping invisible traps from drifting through the depths. An abandoned net is never simply a piece of waste. As long as it remains at sea, it continues fishing.
Key Takeaways
- Ghost nets are lost or abandoned fishing gear that continues capturing marine animals.
- They threaten more than 700 marine species worldwide.
- Coral reefs, mangroves, and seagrass meadows are among the most affected habitats.
- Fishing nets degrade slowly and produce persistent microplastics.
- Solutions include recovery operations, recycling, and more sustainable fishing gear.
FAQ
A ghost net is lost or abandoned fishing gear that continues capturing animals without human intervention.
Because the gear continues fishing long after it has been lost or abandoned.
Sea turtles, sharks, rays, dolphins, whales, seabirds, and many fish species are frequently affected.
Yes. Some recovered nets are transformed into textiles, sports equipment, furniture, and other sustainable products.
Better gear tracking, recovery programmes, recycling, and responsible fishing practices can significantly reduce losses at sea.
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