A major ghost nets cleanup operation in Denmark’s Lillebælt in November resulted in a record catch of eight tons of dangerous ghost nets, abandoned fishing gear that pollutes the ocean for up to 600 years while continuously trapping marine life and releasing toxic substances into the water.
The Scope of Denmark’s Ghost Net Problem
Lost or abandoned fishing nets drift throughout Danish waters, creating a serious environmental hazard. According to estimates from DTU Aqua, approximately 49,000 ghost nets lie on the seabed around Denmark. These ghost nets don’t simply disappear after being lost or discarded.
Fishing nets are made from extremely durable plastic that typically takes 400 to 600 years to decompose on its own. During that time, they continue to cause damage to the marine environment in multiple ways.
Jane Hansen, office manager at the Environmental Protection Agency, explains that ghost nets floating in the water constitute pollution and waste in the ocean. They keep catching birds, fish and crabs long after being lost, and they also destroy kelp and eelgrass.
Toxic Materials Threatening Marine Life and Humans
Beyond the physical threat of entanglement, the materials in these nets release harmful substances that can enter the food chain. There is lead and heavy metals in these nets, along with plastic that releases microplastics into the water. Fish absorb these toxic substances into their organisms, which can eventually be consumed by humans.
The nets pose multiple environmental risks. They damage important marine vegetation like eelgrass beds and kelp forests that provide critical habitat for marine species. Meanwhile, the continuous ghost fishing effect means these abandoned nets keep trapping and killing wildlife for decades.
How the Ghost Nets End Up on the Seabed
Many of the ghost nets found in Lillebælt had been on the ocean floor for several decades. Jesper Appel Jensen, chairman and environmental consultant at North Nature, describes them as remnants from another time. The nets were either lost, thrown overboard or left behind by fishermen.
Record-Breaking Cleanup Operation in Lillebælt
The Environmental Protection Agency hired the organization North Nature, which specializes in collecting ghost nets, to locate and recover abandoned fishing gear in Lillebælt between Assens and Middelfart during November. The operation proved remarkably successful, yielding eight tons of ghost nets.
North Nature utilized advanced technology to locate the submerged nets. For the first time, a new technology called Green Lidar was deployed in a cleanup operation. This method involves flying over the ocean and using green laser technology to take images that reveal where ghost nets are located on the seabed.
According to Jane Hansen, the technology proved accurate in predicting net locations. In total, 73 ghost nets were identified using Green Lidar during the operation.
Community Involvement in the Recovery Effort
The nonprofit organization North Nature conducted the operation in collaboration with local partners. Jesper Appel Jensen describes calling in everyone available, including rescue services, marinas, scouts and anyone who could help with the physical work of recovering the nets.
At some locations, the problem was immediately apparent. Divers could hardly go below the surface in some areas without finding nets, which is both bad news for the environment but good news for the cleanup effort since it means more nets could be recovered.
What Happens to Recovered Ghost Nets
Once the eight tons of fishing nets were recovered from Lillebælt, the plastic material had to be destroyed because it cannot be recycled. However, the lead weights that keep the nets submerged can be reused and were sent for recycling.
Jane Hansen notes that this was the largest single operation ever launched to recover ghost nets in Danish waters. The substantial haul demonstrates both the severity of the problem and the effectiveness of new detection technologies.
National Action Plan Targets Ghost Nets
Recognizing the seriousness of the ghost net problem, a broad majority in the Danish Parliament passed a national action plan against ghost nets during the summer. The plan allocates ten million kroner for prevention and collection of ghost nets in Danish waters.
This funding represents a significant commitment to addressing the problem systematically rather than through isolated cleanup efforts. The success of the Lillebælt operation demonstrates that with proper technology and coordination, substantial progress can be made in removing these dangerous ocean pollutants.
Despite this progress, the estimated 49,000 ghost nets still lying in Danish waters represent centuries of accumulated fishing gear. Given that each net can pollute for up to 600 years, the urgency of continuing cleanup operations remains high.
Sources and References
The Danish Dream: Danish Ghost Nets Crisis Drives Cleanup Efforts
The Danish Dream: Best Environmental Services in Denmark for Foreigners
