The Barents Sea, an Arctic shelf area north of Norway and Russia, is among the world’s richest fishing grounds, and its fish population is changing as the waters warm. Interest from the oil industry is increasing as well, setting up potential conflicts between oil exploration and fisheries. (See related interactive map: The Changing Arctic.

The Barents is home to the world’s largest stock of cod, with a sustainable catch of about 1 million tonnes (valued at about $2 billion) both for 2013 and 2014. This stock has increased considerably in recent years, both due to favorable environmental conditions and sensible management. Management of the fish resources in the Barents Sea has since 1976 been carried out through the Joint Norwegian-Russian Fisheries Commission. This joint management regime is generally considered to be successful, as most fish stocks in this area are now in a healthy state.

The Arctic: The Science of Change
Learn more about the issues surrounding a changing region.

In recent years, annual surveys conducted jointly by Norway and Russia have shown that cod are moving farther north and east than ever before*. These are stray individuals, but the main cod concentrations have also moved northwards in a similar way.

The northward migration of cod is a feeding migration: The cod follows its main prey, capelin—a small salmonid fish—and is able to follow it farther because of an increase in sea temperatures and decrease in ice cover. Cod is, however, not likely to cross the shelf-break and move further north into the deep Polar Ocean, as it is rarely found at depths larger than about 500 meters (1,640 feet). (Vote and comment: “Arctic Activity Is Ramping  Up. What Do We Need to Know More About?“)

The conflict between the energy and fishing industries takes place especially in the spawning and nursery areas for fish. So far, the areas close to the main cod spawning grounds in Lofoten/Vesterålen have not been opened to oil exploration, but this has been a hot issue in Norwegian politics for several years.

So far, the recent changes to fish patterns are mostly occurring within feeding grounds: spawning areas and the general migration patterns between spawning, feeding and wintering areas are much more resistant to changes, both in the Barents Sea and elsewhere. Cod and most other major Barents Sea stocks spawn off the coast of Northern Norway, and so far, changes in spawning areas have been minor.

A considerable part of the fishery industry is at or near the spawning grounds, and due to fuel costs, and weather conditions, it is not likely that the fishing areas will change as much as the distribution of fish during the feeding migrations. The division of the quotas for cod and other major fish stocks in the Barents Sea between Norway and Russia has remained unchanged since the 1970s, despite variations in geographical distribution, so it would take a major change in distribution to re-open this issue.

Another stock which has expanded its geographical range northwards in recent years is the mackerel. This species prefers more temperate waters than do cod, but it has in recent years extended its range to the northwest and northeast, and is now found from the Bay of Biscay in the south to the east coast of Greenland in the northwest and the southern Barents Sea in the northeast. Mackerel was this year found in the Norwegian Sea as far north as 75° N.

The reasons for the northward expansion are the same as for cod – increased temperature (particularly in the surface layers where the mackerel is found) and increased stock size. Management of mackerel has proved more difficult than for cod, as the parties involved (The European Union, Norway, Faroes, and Iceland) have not reached an agreement on how to divide the catch quota between them. The stock has, however, so far been able to cope with catches higher than what is advised by the scientists. (Take the quiz: What You Don’t Know About Energy in the Changing Arctic.)

In the Barents Sea and other northern waters, such as those around Iceland and Greenland, there are large areas where fishing has been almost the only offshore activity going on, but where oil exploration could be moving in. As the fish stock changes along with the climate, these very rich fishing grounds will need continued monitoring and cooperation between fisheries and other industries seeking to enter the region.

* In 2012, cod was found as far north as 82° 30’ N 56° E (north of Franz Josef Land) and in 2013, as far east as 78° 30’ N 79° 30’ E (in the northern Kara Sea – and at the same longitude as India!).

Comments

  1. Bjarte Bogstad
    Bergen
    December 10, 2013, 4:26 am

    At the moment I do not find it alarming. As long as the fish stays inside the EEZ of Norway (Svalbard) and Russia they will be managed within the existing management regime. We don’t expect the fishing activity to move as far north as the fish moves on feeding migrations in summer/autumn, as long as they can catch the fish further south during other times of the year. However, if the fish stocks starts spawning in new areas, there could be large changes in where the fish is found during the year and this could also affect the division of quotas between countries.

  2. Thomas Christopher
    Seattle
    December 6, 2013, 2:29 am

    @Louis Hooffstetter

    “The Barents’ sea is not warming.”

    When the very first sentence of a post contains a bald faced lie, you can’t trust anything the post says, period.

    There are no insecurities about wether or not the Barents Sea is warming. It’s not modelled, it’s measured over decades. And it’s a fact. The species composition in the high artic seas is changing as well, and with a pronounced intruduction of species more associated with subpolar and more temperate regions.

    @Bjarte Bogstad

    Interesting article. Didn’t know that cod was going that far north in the Barents Sea. Do you find this alarming? How will this affect the fisheries in the area?

  3. Bjarte Bogstad
    December 2, 2013, 9:06 am

    Our knowledge about temperature changes is based on annual observations, not models. For details, look in http://www.imr.no/filarkiv/2013/02/imr-pinro_2-2012_til_web.pdf/nb-no, page 10 and onwards. Do you really call this zero empirical data???

  4. Louis Hooffstetter
    Charleston, SC
    November 30, 2013, 2:06 pm

    “The Barents Sea…fish population is changing as the waters warm.”

    The Barents’ sea is not warming. Climate models are not data. Zero empirical data supports this BS claim.

    When the very first sentence of an article contains a bald faced lie, you can’t trust anything the article says, period.