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Tag: fish20behaviour

Significant genetic changes in wild salmon

A considerable amount of interbreeding between escaped farmed salmon and various wild salmon stocks has occurred. This could have serious repercussions for the salmon populations, as indicated in a new study.

Do great white sharks exist off the coast of Norway?

ASK A RESEARCHER: Researchers are not entirely in agreement.

Study finds that sharks may have been part of Stone Age Norwegian coastal diets

Porbeagle sharks supposedly taste like veal, and were a formidable opponent. Catching one may have conferred high status, according to a researcher.

Norwegian and Swedish researchers completely disagree about pike

Is pike a useful or harmful species? A new study is sounding the alarm that there are too few predatory fish in the Baltic Sea.

Can fish drown?

ASK A RESEARCHER: Fish can actually drown both on land and in water.

This shark postpones having sex until it is over 100 years old

Not that strange perhaps, now that we know how long the mysterious Greenland shark can live.

Fatty acid composition in the salmon fillet can be measured in seconds

SHARE YOUR SCIENCE: Norwegian farmed salmon is a good source of the healthy fatty acids, found in fatty fish.

Herring roe will be used in medicine to treat psoriasis

Medicines are not just chemistry - many come from animals and plants.

Electric fence against salmon lice

An electric fence keeps the salmon healthy. But we will never find a lasting solution to salmon lice, says one researcher.

Farmed salmon need zinc to avoid getting sick. But zinc in the ocean harms the environment

Either farmed fish health or the environment suffers.

Researchers tracked a bluefin tuna’s 15 000 kilometre swim across the Atlantic and back

A 250 kilo Atlantic bluefin tuna had a satellite tag attached to its back in the autumn of 2020. A year later, the researchers located the same tuna again outside Florø, Norway’s westernmost town. It had swum the equivalent of more than a third of the way around the equator.

Fish in the Arctic deformed by tiny amounts of oil contamination

Polar cod are very sensitive to crude oil contamination, a new study shows.

Noise caused sea lice to eat and reproduce less

This parasite costs Norwegian salmon farming almost 500 million euros each year. Could noise be the solution? Sound-emitting speakers weaken the lice's appetite. They fall off more easily and their reproduction drops dramatically, according to experiments in a Norwegian fjord.

This fish grunts when it is ready to have sex

SHARE YOUR SCIENCE: Have you ever lain on a seafront jetty fishing, perhaps with a cracked mussel on the hook? Then you have probably seen this colourful little fellow, the corkwing wrasse. The next time you see it, you should also prick up your ears

Food fraud: Do you really know what fish species you are eating?

When you buy fish from a store, or when you are served a fish dish in a restaurant, you expect to get what the label says or to eat what you ordered. Unfortunately, the reality is sometimes far from expectations.

Matured cheese and ham - yes please, but what about matured clipfish?

A Norwegian google search for "matured food" displays results for balsamic vinegar, cured meat, fermented trout and many types of cheese. Why isn’t clipfish on the list?

Would you like salt fish or klippfisk for dinner today?

That’s really something you should have thought of yesterday or even the day before.

It matters who your mother is, even for fish

OPINION: New research could result in both bigger and better farmed fish.

How cod took over in the icy Arctic waters

Codfish can eat prey right up under the sea ice in winter, thanks to an antifreeze in their blood.

Can salmon lice end up on your dinner plate?

Are there any parasites on the fish you buy in the store?

Sports drinks from fish heads

In a couple of years you might drink some fish parts after exercising at a gym.

Goby behaviour says much about sexual selection

One fish off the coast of central Norway has set a record for the number of female mates it had. And that’s not all.

An in-trawl camera for fish

A cod swims right past the camera. These images could make it easier to set fishing quotas.

Fish in drug-tainted water see some benefits

Swedish freshwater perch have been seen to thrive in water contaminated by anti-anxiety medications. Researchers think most studies, which look solely at the negative aspects of pharmaceutical pollution, could be missing some perks for perch.

Missing link found on sharks

On any visit to a rocky seashore, you are likely to spot barnacles, unoffendingly stuck to hard surfaces. But barnacles in a fjord in Norway have become parasites that eat fish through feeding stems.

Why Japanese connoisseurs love Norwegian mackerel

There's nothing fishy about it: an advanced MRI machine explains exactly why the Japanese prefer Norwegian mackerel. The secret is in the fat.

Fishing: Big increase in catch-and-release

Anglers have in the last few years become steadily more likely to release their catches after reeling them in. Most of these fish survive the ordeal, but it is far from painless.

Puffin chicks die of hunger

For seven years now, Atlantic puffins have been abandoning chicks and eggs in their nesting colonies because they cannot find enough food. The ocean is teeming with mackerel which consume the small fish that puffins normally feed to their offspring.

Farmed salmon are as fertile as wild salmon

The sperm from farmed male salmon are just as likely as the sperm of wild salmon to succeed in fertilising wild salmon eggs, experiments have shown. Researchers recommend that farmed salmon be made sterile.

More fish found deeper in the ocean

The amount of fish in the world is being reassessed upwards. Some ten billion tonnes of fish that live at depths down to a kilometre are not fished at all. A University of Bergen professor thinks this biomass will be much more important for humankind in the future.

Spawning cod packed with vitamins

Cod migrate from the Barents Sea to the Lofoten Islands in North Norway to spawn every winter. The fishing season for these large spawning cod, called skrei in Norwegian, is currently open. A traditional North Norwegian serving of the fish is a super source of vitamin D.

Clumsy clown of the seabed

The spiny lumpsucker is too sluggish to avert the slow hand of a diver, yet it manages to catch some of the most important swimmers in the Arctic Ocean.

Creatures from the deep and cold Atlantic sea

Check out what swims around a thousand metres down off Greenland.

Larger offspring when fish pick own mates

It might not be so advantageous for us to help endangered animal species by selecting what we consider suitable mates for them.

Want some week-old fish?

Most of us would refrain from buying fresh fish that was caught more than three days ago. But if we don’t know the day of catch, we gladly consume fish that is much older.

Standard research fish lacks a standard diet

Zebrafish have been used as a research standard to help scientists expand our understanding of everything from skin cancers to cardiovascular disease. But one Norwegian researcher cautions that research that relies on zebrafish might be less reliable because the fish are not fed a standardised diet.