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Fish disease

Farmed salmon with lice prefer the deep

At night, salmon with heavy lice infestations swim deeper than the rest of the shoal. For the first time, this shows that salmon might have a natural behaviour that prevents new sea lice infestations.

Video: Salmon lice on sea trout and Atlantic salmon

Salmon lice have always been a natural parasite on wild salmonids. However, during the last years the infestation of salmon lice has increased on wild salmonids causing negative consequences – and especially for sea trout.

Mutated salmon louse DNA spread throughout the North Atlantic in 11 years or less

A recent study has demonstrated that genetic changes giving the salmon louse partial resistance towards one of the most commonly used delousing chemicals in marine aquaculture (emamectin benzoate/Slice) have spread to salmon lice in the entire North Atlantic in a maximum of just 11 years.

Human vaccines to aid farmed fish

Scientists will use compounds from human vaccines to improve vaccines for aquaculture fish stocks.

Tailor-made medicine to fight the salmon louse

The salmon louse has become ever more resistant to drugs. The Sea Lice Research Centre in Bergen works to find new solutions to fight it.

Studying fish health via genes

Scientists are using a recently developed genomic tool to identify why some salmon are more resistant to lice than others.

Wild and farmed fish infect each other

A genetic comparison of the virus associated with the disease HSMI shows that virus transmission probably occurs between farmed and wild fish.

Coastal streams spread virus between farmed fish

The spread of pancreas disease between farms can be best explained by the direction of surface ocean currents.

Clustering fish serial killer

It strangles its victims - slowly. Despite treatments, the microorganism Saprolegnia are a recurring problem for fish hatcheries and fry production over the world, causing considerable losses.

A cold cure for sick fish

When pipefish are sick, they swim towards cooler water to get better. But what will happen when global warming causes the world's seas to heat up?