Jellyfish can cause high mortality of farmed fish and hence significant economic losses for the aquaculture industry. Despite their socio-economic importance, distribution and diversity data on gelatinous plankton are scarce from northern Norwegian fjords and other Nordic systems. Intense blooms of jellyfish have repeatedly been observed in Ryggefjord, Finnmark (Norway), sometimes concurrent with ...

Acoustic telemetry was utilized to track 49 brown trout (<i>Salmo trutta</i>) and 37 Arctic charr (<i>Salvelinus alpinus</i>) first-time migrants of wild origin [post-smolts; mean LF (fork length): 169 and 172 mm] in a large fjord in northern Norway. The <i>S. trutta</i> were registered at sea for more than twice the time of the <i>S. alpinus</i> (medians of 54 and 22 days, respectively). Both species ...

<b>Background:</b> Brucellosis is the most common zoonotic infections in pastoral settings. Lack of knowledge about the disease may cause devastating out come to the patients, thus sustained it in such communities. This study assessed knowledge and practices among high-risk groups in Bahr el Ghazal region, South Sudan. <br><b>Methods:</b> Across sectional survey involving abattoir workers, febrile ...

Oppdrett av blåskjell har i de senere år økt sterkt i omfang i Norge, men kunnskapen om de økologiske konsekvensene av virksomheten er meget begrenset. Et betydelig problem som har oppstått i denne forbindelse er predasjon fra fugl, og da særlig ærfugl. Dette har klare negative konsekvenser for lønnsomheten, samt representerer et kunstig habitat og mulige negative påvirkninger for fugl. Bedre ...

Ved vanning av spiselige jordbruksvekster på friland i Norge brukes det overflatevann, grunnvann eller vann fra gravd brønn. Vannet kan være offentlig eller privat. Mikroorganismer og uønskede kjemiske stoffer i slikt vann kan forårsake sykdom, dersom dette benyttes til vanning av vegetabiler. For sykdomsfremkallende mikroorganismer gjelder dette spesielt ved vanning av vegetabiler som skal spises ...

The Barents Sea has been coined ‘the Arctic hotspot’ of climate change due to the rapidity with which environmental changes are taking place. This transitional domain from Atlantic to Arctic waters is home to highly productive benthic communities. This system strongly fluctuates on a seasonal basis in its sympagic-pelagicbenthic coupling interactions, with potential effects on benthic standing ...

Prey preference of top predators and energy flow across habitat boundaries are of fundamental importance for structure and function of aquatic and terrestrial ecosystems, as they may have strong effects on production, species diversity, and food-web stability. In lakes, littoral and pelagic food-web compartments are typically coupled and controlled by generalist fish top predators. However, the ...

Recent warming in the Arctic, which has been amplified during the winter, greatly enhances microbial decomposition of soil organic matter and subsequent release of carbon dioxide (CO₂). However, the amount of CO₂ released in winter is not known and has not been well represented by ecosystem models or empirically based estimates. Here we synthesize regional in situ observations ...