Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river
Growth, density and production of juvenile Atlantic salmon and brown trout were studied in three different sections of the Kvassheimsåna River in south‐western Norway from 1979 to 1983. Section 1. in the upper part of the river, is located above a waterfall impassable for migratory salmonids and is...
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1990
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Online Access: | http://dx.doi.org/10.1111/j.1095-8649.1990.tb03556.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1990.tb03556.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1990.tb03556.x |
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crwiley:10.1111/j.1095-8649.1990.tb03556.x 2024-06-02T08:03:39+00:00 Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river Bergheim, A. Hesthagen, T. 1990 http://dx.doi.org/10.1111/j.1095-8649.1990.tb03556.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1990.tb03556.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1990.tb03556.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Fish Biology volume 36, issue 4, page 545-562 ISSN 0022-1112 1095-8649 journal-article 1990 crwiley https://doi.org/10.1111/j.1095-8649.1990.tb03556.x 2024-05-03T11:53:13Z Growth, density and production of juvenile Atlantic salmon and brown trout were studied in three different sections of the Kvassheimsåna River in south‐western Norway from 1979 to 1983. Section 1. in the upper part of the river, is located above a waterfall impassable for migratory salmonids and is surrounded by grazing land. Sections 2 and 3, in the middle and lower parts of the river, are influenced by agricultural activity. Total nitrogen concentration varied between 250 and 1000 μg l −1 in section 1 and 1500 and 2500 μg l −1 in sections 2 and 3. Total phosphorus (Tot‐P) concentrations also increased with decreasing altitude: 19–46 μg l −1 in section I and 31–101 μg l −1 in sections 2 and 3. The number of 0 + salmon in sections 2 and 3 varied between 30.1 and 167.8 specimens 100 m −2 , with means 90.2 and 95.2 specimens 100 m −2: , respectively; the density of 1 + salmon, with mean values of 16.3 and 51.0 specimens 100m −2 was significantly correlated with the original fry density. The growth rate of 0+ salmon was not inversely related to cohort density, but was significantly so for 1 + salmon. Mean annual salmon production in section 2 was 1595 g 100 m −2 year 1 , and in section 3 was 841 g 100m −2 year 1 . A logarithmic function gave the best curve fit between salmon production and mean annual biomass. Thus, production levelled off for the highest values recorded in section 2, and perhaps approached the carrying capacity of the stream. A multiple regression analysis showed that yearly variation in 1 + salmon density was the single factor accounting for most of the total variability in production (60%). Variation in water temperature and nutrient content were not significantly related to variation in fish production. Densities of brown trout were low in all sections (<20 specimens 100m −2 ). Fry density was highest in section 3 and parr density in section 1. All age groups of sympatric brown trout grew significantly faster in sections 2 and 3 compared with allopatric brown trout in section 1. Article in Journal/Newspaper Atlantic salmon Salmo salar Wiley Online Library Norway Journal of Fish Biology 36 4 545 562 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Growth, density and production of juvenile Atlantic salmon and brown trout were studied in three different sections of the Kvassheimsåna River in south‐western Norway from 1979 to 1983. Section 1. in the upper part of the river, is located above a waterfall impassable for migratory salmonids and is surrounded by grazing land. Sections 2 and 3, in the middle and lower parts of the river, are influenced by agricultural activity. Total nitrogen concentration varied between 250 and 1000 μg l −1 in section 1 and 1500 and 2500 μg l −1 in sections 2 and 3. Total phosphorus (Tot‐P) concentrations also increased with decreasing altitude: 19–46 μg l −1 in section I and 31–101 μg l −1 in sections 2 and 3. The number of 0 + salmon in sections 2 and 3 varied between 30.1 and 167.8 specimens 100 m −2 , with means 90.2 and 95.2 specimens 100 m −2: , respectively; the density of 1 + salmon, with mean values of 16.3 and 51.0 specimens 100m −2 was significantly correlated with the original fry density. The growth rate of 0+ salmon was not inversely related to cohort density, but was significantly so for 1 + salmon. Mean annual salmon production in section 2 was 1595 g 100 m −2 year 1 , and in section 3 was 841 g 100m −2 year 1 . A logarithmic function gave the best curve fit between salmon production and mean annual biomass. Thus, production levelled off for the highest values recorded in section 2, and perhaps approached the carrying capacity of the stream. A multiple regression analysis showed that yearly variation in 1 + salmon density was the single factor accounting for most of the total variability in production (60%). Variation in water temperature and nutrient content were not significantly related to variation in fish production. Densities of brown trout were low in all sections (<20 specimens 100m −2 ). Fry density was highest in section 3 and parr density in section 1. All age groups of sympatric brown trout grew significantly faster in sections 2 and 3 compared with allopatric brown trout in section 1. |
format |
Article in Journal/Newspaper |
author |
Bergheim, A. Hesthagen, T. |
spellingShingle |
Bergheim, A. Hesthagen, T. Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river |
author_facet |
Bergheim, A. Hesthagen, T. |
author_sort |
Bergheim, A. |
title |
Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river |
title_short |
Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river |
title_full |
Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river |
title_fullStr |
Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river |
title_full_unstemmed |
Production of juvenile Atlantic salmon, Salmo salar L., and brown trout, Salmo trutta L., within different sections of a small enriched Norwegian river |
title_sort |
production of juvenile atlantic salmon, salmo salar l., and brown trout, salmo trutta l., within different sections of a small enriched norwegian river |
publisher |
Wiley |
publishDate |
1990 |
url |
http://dx.doi.org/10.1111/j.1095-8649.1990.tb03556.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1095-8649.1990.tb03556.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1095-8649.1990.tb03556.x |
geographic |
Norway |
geographic_facet |
Norway |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_source |
Journal of Fish Biology volume 36, issue 4, page 545-562 ISSN 0022-1112 1095-8649 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1095-8649.1990.tb03556.x |
container_title |
Journal of Fish Biology |
container_volume |
36 |
container_issue |
4 |
container_start_page |
545 |
op_container_end_page |
562 |
_version_ |
1800748237717504000 |