The great cormorant (Phalacrocorax carbo) has undergone a dramatic population recovery in Europe, rebounding from near-extinction in the mid-20th century to a population exceeding 1.2 million birds. This surge has triggered intense conflict between conservationists, who celebrate the recovery as a success of the EU Birds Directive, and commercial fisheries and angling groups, who report significant economic losses due to the birds’ predatory impact on fish stocks.
The Recovery of the Great Cormorant
Decades of intensive hunting and habitat degradation pushed the great cormorant toward local extinction across much of Europe by the 1960s. According to the European Commission, the implementation of the Birds Directive in 1979 provided the species with strict legal protection, allowing populations to expand rapidly.
By the early 21st century, the species had recolonized inland waters and coastal regions across the continent. Data from the Wetlands International Cormorant Research Group indicates that the expansion was facilitated by an abundance of food in eutrophic waters and a lack of significant natural predators. This population shift has moved the species from a conservation priority to a management challenge in many member states.
Economic Impact on Fisheries
The expansion of cormorant colonies has led to increased pressure on both wild fish populations and aquaculture. Commercial fishers and inland angling associations argue that the birds consume vast quantities of commercially valuable fish, such as trout, grayling, and perch.
The European Inland Fisheries and Aquaculture Advisory Commission has documented that in some regions, cormorant predation accounts for the loss of a significant percentage of annual fish recruitment. While conservationists point out that fish declines are often multifactorial—citing water pollution, climate change, and overfishing—fishery operators maintain that the birds’ presence is a direct threat to the economic viability of small-scale inland fisheries.
Current Management and Legal Frameworks
Because the great cormorant is protected under the Birds Directive, member states cannot implement indiscriminate culling. Instead, they must apply for derogations—special permits that allow for lethal control or scaring techniques under strictly monitored conditions.
The European Commission’s guidance on cormorant management emphasizes that states must prove that damage to fisheries is significant and that non-lethal deterrents have proven ineffective. This creates a complex bureaucratic process for local authorities. Critics of this system argue the process is too slow to address immediate seasonal damage, while environmental groups often challenge the scientific basis for large-scale culling permits in national courts.
Key Considerations for Population Trends
| Factor | Impact on Cormorant Population |
|---|---|
| Legal Protection | Primary driver of recovery since 1979 |
| Water Quality | Eutrophication increases fish availability |
| Human Conflict | Leads to localized management and culling |
| Climate Change | Shifts migration patterns and nesting sites |
Frequently Asked Questions
Why is the great cormorant protected if populations are high?
The species remains protected under the EU Birds Directive because protection status is determined at the continental level, and population fluctuations remain sensitive to environmental changes and habitat loss.
Are there non-lethal ways to manage cormorant populations?
Yes. Authorities often use pyrotechnics, laser deterrents, and protective netting for aquaculture ponds to minimize predation without resorting to lethal control.
Who decides if culling is permitted?
Individual EU member states are responsible for issuing derogation permits, provided they adhere to the scientific and legal criteria established by the European Commission.