A rare ocean sunfish washed up at a Danish beach just after Christmas, surprising locals and drawing attention from marine experts. The unusual find will now become part of Denmark’s official scientific fish collection.
A surprising holiday discovery
A quiet walk by the water turned extraordinary for Brøndby Strand resident Connie Olsen on December 26. She was strolling through Køge Bay’s Strandpark, a stretch of coastline south of Copenhagen she knows well. Between seaweed and sand, she suddenly spotted a large, flat fish unlike any she had ever seen before.
The creature’s oval body, stiff tail flaps, and tiny fins left little doubt. It was an ocean sunfish, known in Danish as a *klumpfisk*. At first, Olsen thought it might still be alive and even tried to guide it back into the water. Before long, it became clear the fish had already died.
Added to Denmark’s national collection
Officials from the Strandpark quickly contacted the Natural History Museum of Denmark, which is responsible for cataloging the country’s marine life. Biologist Henrik Carl from the museum took charge of the specimen and confirmed its identity. The sunfish measured about 63 centimeters in length and weighed 13.5 kilograms, a normal size for a young individual.
The fish has now been preserved and will be stored at the museum for further research. It will join many other specimens that document Denmark’s natural marine heritage.
Interestingly, this coastal area is known for its diverse wildlife and is near Fur Island, a region also recognized for its impressive geological and natural history features.
A rare but recurring visitor
Even though finding an ocean sunfish in Danish waters is uncommon, it is not entirely without precedent. According to the Natural History Museum, three such fish have been registered along Denmark’s coasts in December alone. The Køge Bay area, where the latest one appeared, is one of several coastal “hotspots” where beachgoers sometimes discover stranded marine species.
Sunfish sightings often occur in late autumn or early winter. The species typically arrives in Denmark during the summer months when the sea is warmer. When waters cool down quickly, some fish do not make it out to milder regions in time and die from exposure to the cold.
Patterns in recent years
In past seasons, there have been notable strandings. In 2018, several were found in North Zealand, and in 2014, at least 80 dead ocean sunfish were recorded in Danish waters. A particularly large one appeared in January 2023 off Saltum Beach in North Jutland, weighing approximately 230 kilograms. That is many times heavier than typical local finds, which usually range from 10 to 30 kilograms.
The heaviest sunfish ever recorded in Denmark was found in 1944 near Skagen and weighed an astonishing 566 kilograms. Globally, this species can reach lengths of three meters and weigh over a metric ton, making it one of the largest bony fish in the world.
Public encouraged to report discoveries
The museum urges anyone who finds unusual marine animals along Danish beaches to report them through Fiskeatlasset, Arter.dk, or local aquariums. These reports help researchers track ocean trends and understand how shifting temperatures affect marine species visiting Danish waters.
For visitors interested in exploring Denmark’s natural history, the Natural History Museum in Copenhagen is one of many museums that showcase the country’s connection to the sea and its fascinating wildlife.
The washed-up sunfish from Brøndby Strand is now part of that story, preserved as both a scientific specimen and a reminder of the unpredictable beauty of Denmark’s coasts.
Sources and References
The Danish Dream: Fur Island – Timeless Geological Wonders
The Danish Dream: Best Museums in Denmark for Foreigners
TV2: Sjælden fisk skyllet i land ved dansk kyst
