Fish health

Fish health is about animal welfare, finances and the healthy reputation that farmed fish deserve and on which the industry relies 

Fish health

Fish health is about animal welfare, finances and the healthy reputation that farmed fish deserve and on which the industry relies. On these pages we have gathered much of our knowledge about fish health. We hope it will be useful for those who work with fish farming or interesting for those who want to know more about the industry

News fish health

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The myths about antibiotics

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Nutrition

Until a few years ago, it was not common that cleaner fish in cages were fed maintenance feeds. This practice has now changed however as research has identified that insufficient access to the correct nutrients makes for less healthy and less functional cleaner fish.

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Wild-caught wrasse

There are six species of wrasse living in Norwegian waters. Goldsinny and corkwing are the most common. There are smaller numbers of ballan wrasse, rock cook wrasse, scale-rayed wrasse and cuckoo wrasse.

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Why cleaner fish?

The salmon louse is the most common parasite on farmed salmon, and one of the biggest challenges for the aquaculture industry. Cleaner fish, which from nature's perspective are designed to feed on such parasites, are used in the cages to feed on lice from farmed fish.

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What are salmon lice?

The greatest health challenge for the fish farming industry today is infection with the parasite Lepeophtheirus salmonis, better known as the salmon louse.

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Endurance tests in “The Flume”

To test the influence of feed on cardiovascular capacity and simultaneously examine the role of phospholipids, four test diets were used. Two contained high levels of EPA and DHA, and two had low levels. One of the levels contained krill oil – a source of fatty acids – and the other fish oil. The feed was administered over a period of 8 weeks before samples were taken and measurement of cardiac performance was made in "The Flume".

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Results from field trials undertaken during 2013 and 2014

The trial in 2013 was a commercial trial with a customer in Central Norway with v12G, where two sets of two cages were compared with respect to origin and disease history. The trial in 2014 was carried out on a group of fish in southern Norway without significant disease problems during the trial period.

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HSMI infection experiments at VESO Vikan

Pre-smolt received trial diets for 8 weeks in freshwater before being transferred to the sea. The infection was introduced directly after their transfer to seawater. To simulate a natural transmission of infection, infectious “Trojans” were used.

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