Ørretens viktigste næringsdyr på Hardangervidda

Qvenild, Tore; Fjeld, Eirik; Fjellheim, Arne; Hesthagen, Trygve; Lakka, Hanna‐Kaisa; Rognerud, Sigurd; Tysse, Åsmund

doi:10.18261/issn.1504-3118-2021-04-06

Cited by 1 publication

(1 citation statement)

References 8 publications

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“…Temperature was early identified as a controlling factor in marine fisheries (Rollefsen 1948), and with a significant positive relationship between recruitment and temperature for species like cod Gadus morhua L. 1758, haddock Melanogrammus aeglefinus L. 1758 and herring Clupea harengus L. 1758 (Bogstad et al 2013). Although at a smaller scale compared to the marine fisheries, the low annual brown trout yield obtained from lakes on Hardangervidda during the 1920s and the first years of the 1930s, followed by a substantial increase in yields during the next years, have been explained by changes in snow depth and summer temperatures (Sunde 1937;Rognerud et al 2003;Qvenild 2004). These environmental conditions influence…”

Section: Discussionmentioning

confidence: 99%

Annual growth of brown trout in alpine lakes is highly influenced by spring snow depth and ice-out day

Borgstrøm

2023

Fauna Norv.

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Growth of annular zones in otoliths of brown trout from the alpine lakes Litlosvatn and Kollsvatn on western part of the Hardangervidda mountain plateau have been studied during the period 2004–2021, concurrent with recordings of accumulated snow in spring and dates of ice-out. Unlike the conditions in lowland areas, years with much accumulated snow have not decreased during the last decades, and years with delayed ice break-up are still frequent, opposite the trend observed elsewhere in Europe and in North America. The annual growth of the brown trout otoliths is significantly reduced in years with much snow in April and late ice-out dates, irrespective of age of the fish, indicating that somatic growth of brown trout is considerably reduced in such years. Accumulated snow in spring and ice-out day may thus be useful parameters in predictions of fish production and potential yield in such alpine lakes.

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Section: Discussionmentioning

confidence: 99%

Annual growth of brown trout in alpine lakes is highly influenced by spring snow depth and ice-out day

Borgstrøm

2023

Fauna Norv.

View full text Add to dashboard Cite

show abstract

Ørretens viktigste næringsdyr på Hardangervidda

Cited by 1 publication

References 8 publications

Annual growth of brown trout in alpine lakes is highly influenced by spring snow depth and ice-out day

Annual growth of brown trout in alpine lakes is highly influenced by spring snow depth and ice-out day

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