For many Danish fishermen, the sight of a seal is unwelcome. The animals are quick to break into nets and consume large amounts of fish, adding to the pressures on an industry already challenged by falling stocks. “It is a controversial animal that creates problems for fishing,” says biologist Magnus Wahlberg, who often hears frustration from fishermen.
Seals, opportunistic hunters, do not hesitate to help themselves when they find a net filled with cod or herring. The result is not only lost catch but also damaged gear. For fishermen working with limited quotas and tight margins, the competition is stiff to ignore.
Numbers falling after years of growth.
Yet at the same time, researchers are sounding the alarm over seal populations themselves. After decades of steady recovery, the number of harbour seals in the Kattegat and Skagerrak has started to fall. According to new research from Aarhus University, numbers peaked at around 14,000 in 2015 but have since dropped to about 12,000.
Senior researcher Anders Galatius has spent years flying over the region to count seals resting on sandbanks. He calls them “top predators” that reveal much about the health of the sea. “If seal numbers are declining, it is a sign the wider ecosystem is struggling,” he explains.
Seals caught in a bigger struggle
The reasons for the decline are not fully clear. Still, scientists point to familiar problems: overfishing, pollution from agriculture, and oceanic oxygen depletion. These reduce the availability of fish, leaving both fishermen and seals with less to live on.
Still, experts stress that the population is far from collapse. “There are still plenty of harbour seals, and they are adaptable,” says Wahlberg. However, he notes that the conflict with fishermen will not be resolved.
The debate reflects Denmark’s complex relationship with seals. Once hunted to near extinction and protected since the 1970s, they are now both a symbol of successful conservation and a source of daily frustration on the coast. How the country balances these roles—predator, competitor, and protected species—may define the next chapter in its story.