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Seal parasite threatening Denmark’s cod

Christian Wenande
February 4th, 2016


This article is more than 8 years old.

Danish fishing industry netting dire consequences due to emaciated population

Researchers warn there are so many grey seals in Danish waters now that they are threatening the nation’s fishing industry.

Aside from devouring large numbers of fish, the rapidly increasing seal population has also infected the cod population with parasites that make them emaciated and unappetising. The problem is particularly concerning in the Baltic Sea.

“We’ve been able to register that the Baltic Sea cod has gone from having none or very few of these parasites in their livers to having up to 400 in one fish,” Kurt Buchmann, a professor in aquatic pathobiology at the University of Copenhagen (KU), told Baglandet, a radio program on P1.

“It’s quite some change in recent years. We’ve seen the rise in connection with a significant increase in the seal population in the Baltic Sea.”

READ MORE: Government sets aside funds for fishing and aquaculture

Uncooked = unwelcome guests
There are two types of parasites in the cod, which both stem from the seal: the liver worm and the cod worm.

The liver worm isn’t dangerous to humans, unless you eat raw cod liver. The cod worm is found in the fillet itself and dies when exposed to high temperatures. But if not, it can burrow into the gut and lead to a serious stomach infection.

The development has reportedly had dire consequences for the Danish fishing fleet operating in the Baltic Sea, particularly out of Bornholm.


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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.”