Venomous Fish Numbers Rise in Danish Waters

The population of the lesser weever fish is growing in Danish waters. This fish is locally known as fjæsing. Recent monitoring shows a clear increase in their numbers across Denmark. They thrive in coastal marine areas during warm summer months.

• The fjæsing is a venomous fish found in shallow sandy waters around Copenhagen.
• Stings cause severe pain and local swelling in your foot or leg.
• Put the stung area in 45°C hot water for 30 to 90 minutes.
• Wear rubber bathing shoes at local beaches to protect your feet.
• Call 1813 in Copenhagen if you need medical assistance after a sting.

In Copenhagen, this affects popular swimming spots like Amager Strandpark and Bellevue. The fish likes shallow water with sandy seabeds. It buries itself in the sand to hide. Only its sharp dorsal fins stick out above the sand. Swimmers can easily step on them while walking in the sea.

The fins carry a painful venom. A sting causes strong pain, swelling, and burning feelings. If you get stung, act quickly to stop the pain. Place your foot in hot water immediately. The water should be around 45 degrees Celsius. Heat breaks down the fish venom fast.

Consider wearing bathing shoes when walking in shallow water. This is especially useful for children at local beaches. If pain continues, call the Danish medical helpline 1813. You can also ask a local lifeguard for quick help.