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Invasive crabs scuttling across Denmark

Christian Wenande
August 6th, 2018


This article is more than 6 years old.

Aggressive and territorial ‘foreigners’ showing up in more areas

Oh crab! They’re spreading (photo: Hans Hillewaert)

Two invasive crab species, the brush-clawed shore crab and the Asian shore crab, are spreading more across Denmark, according to the Miljøstyrelsen environment authority.

This year, there have been more sightings of the crabs, which are more territorial and aggressive than the resident shore crabs in Denmark and thus more dominant in the struggle for food.

The crabs were first spotted in Denmark in 2011 near Rømø and have since been documented along the western coast and in Limfjorden.

READ MORE: Danes getting rid of thousands of invasive pets

Report a crustacean
Both crabs are smaller than Denmark’s resident shore crab and are distinguished by their shields being squarer and their eyes being much further apart. Another invasive crab causing trouble in Denmark is the Chinese mitten crab.

To get a better overview and report sightings of the invasive crabs, the public can access Miljøstyrelsen’s portal for invasive species (in Danish).

Anyone reporting the sighting of an invasive species is required to attach a photo of the crab in question so that the observation can be confirmed.


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A survey carried out by Megafon for TV2 has found that 71 percent of parents have handed over children to daycare in spite of them being sick.

Moreover, 21 percent of those surveyed admitted to medicating their kids with paracetamol, such as Panodil, before sending them to school.

The FOLA parents’ organisation is shocked by the findings.

“I think it is absolutely crazy. It simply cannot be that a child goes to school sick and plays with lots of other children. Then we are faced with the fact that they will infect the whole institution,” said FOLA chair Signe Nielsen.

Pill pushers
At the Børnehuset daycare institution in Silkeborg a meeting was called where parents were implored not to bring their sick children to school.

At Børnehuset there are fears that parents prefer to pack their kids off with a pill without informing teachers.

“We occasionally have children who that they have had a pill for breakfast,” said headteacher Susanne Bødker. “You might think that it is a Panodil more than a vitamin pill, if it is a child who has just been sick, for example.”

Parents sick and tired
Parents, when confronted, often cite pressure at work as a reason for not being able to stay at home with their children.

Many declare that they simply cannot take another day off, as they are afraid of being fired.

Allan Randrup Thomsen, a professor of virology at KU, has heavily criticised the parents’ actions, describing the current situation as a “vicious circle”.

“It promotes the spread of viruses, and it adds momentum to a cycle where parents are pressured by high levels of sick-leave. If they then choose to send the children to daycare while they are still recovering, they keep the epidemic going in daycares, and this in turn puts a greater burden on the parents.”