This page has only limited features, please log in for full access.

Unclaimed
Svein Saltveit
Freshwater Ecology and Inland Fisheries Laboratory, Natural History Museum, University of Oslo, P.O. Box 1172, Blindern, 0318 Oslo, Norway

Basic Info

Basic Info is private.

Honors and Awards

The user has no records in this section


Career Timeline

The user has no records in this section.


Short Biography

The user biography is not available.
Following
Followers
Co Authors
The list of users this user is following is empty.
Following: 0 users

Feed

Journal article
Published: 19 October 2020 in Sustainability
Reads 0
Downloads 0

The Norwegian electrical energy supply system is based on hydropower. The now deregulated energy market has led to increased use of hydropeaking production, leading to greater fluctuations in discharge and water levels below hydropower stations. The power station HOL 1, with an outlet to the Storåne River, is a large hydropeaking facility. With over 300 rapid flow increases and decreases per year since 2012, it is a river subjected to frequent hydropeaking. To quantify the stranding risk downstream of the power plant, the effect of a series of different turbine shutdown scenarios was simulated in an earlier study. The residual flow of 6 m3·s−1 and a full production of 66 m3·s−1 were considered as the baselines for the calculation of dewatered areas. A three-year study of juvenile fish density both upstream as a reference and downstream of the power plant was undertaken. There were very low densities or even an absence of brown trout (Salmo trutta) older than young-of-the-year (YoY) below the outlet of the power station, despite high densities of YoY in previous years. This is probably due to the large and rapid changes in flow below the power station. Hydropeaking has less impact on the earliest life stages of brown trout during spring and summer, as well as on spawning and egg development during winter. This is attributed spawning in late autumn occurring at a low flow seldom reached during hydropeaking. The high survival of YoY during the first summer and early autumn is likely due to a lower frequency of hydropeaking and higher residual flows, leaving a larger wetted area.

ACS Style

Svein Saltveit; Åge Brabrand; Ana Juárez; Morten Stickler; Bjørn Dønnum. The Impact of Hydropeaking on Juvenile Brown Trout (Salmo trutta) in a Norwegian Regulated River. Sustainability 2020, 12, 8670 .

AMA Style

Svein Saltveit, Åge Brabrand, Ana Juárez, Morten Stickler, Bjørn Dønnum. The Impact of Hydropeaking on Juvenile Brown Trout (Salmo trutta) in a Norwegian Regulated River. Sustainability. 2020; 12 (20):8670.

Chicago/Turabian Style

Svein Saltveit; Åge Brabrand; Ana Juárez; Morten Stickler; Bjørn Dønnum. 2020. "The Impact of Hydropeaking on Juvenile Brown Trout (Salmo trutta) in a Norwegian Regulated River." Sustainability 12, no. 20: 8670.

Special issue paper
Published: 14 October 2019 in River Research and Applications
Reads 0
Downloads 0

The Norwegian river Suldalslågen, known for its population of large‐sized Atlantic salmon (Salmo salar), has been regulated for hydropower in 1966–1967 and in 1980. The initial regulation increased winter flows and reduced summer flows and major floods. The second regulation, involving abstraction of water to a power station in an adjacent fjord, led to a strong reduction in flow. In addition to implementing different flow regimes, many remedial actions have been taken, often concurrently, making it almost impossible to detect the effect of single measures. In addition, the monitoring data have not always been consistent as regards methods and scope, and also, few data are available for preregulation conditions. This highlights major challenges in the long‐term management of regulated rivers. The absence of major floods after regulation led to increased sedimentation and encouraged carpet mosses. This reduced interstitial spaces, creating a poor habitat for salmon fry and benthic invertebrates. The knowledge gained from the wide‐ranging studies of the different flow regimes have enabled the environmental authorities to devise a final regulation regime from 2012. The final flow regime focused on biological values and functions to sustain the strain of wild, large adult salmon. The catch of wild salmon >7 kg has in fact increased since 2010 and stabilized between 1 and 2 metric tons, although the yield of large salmon prior to 1994 is unknown. In addition, the increase in the catch of large salmon is based on hatchery fish. Hatchery fish have also to a large extent contributed to the increase in the total salmon catch in recent years. Thus, that the catches in Suldalslågen are now at an all‐time high is not due to improved conditions in the river but likely to hatchery fish.

ACS Style

Svein Jakob Saltveit; Åge Brabrand; John E. Brittain. Rivers need floods: Management lessons learnt from the regulation of the Norwegian salmon river, Suldalslågen. River Research and Applications 2019, 1 .

AMA Style

Svein Jakob Saltveit, Åge Brabrand, John E. Brittain. Rivers need floods: Management lessons learnt from the regulation of the Norwegian salmon river, Suldalslågen. River Research and Applications. 2019; ():1.

Chicago/Turabian Style

Svein Jakob Saltveit; Åge Brabrand; John E. Brittain. 2019. "Rivers need floods: Management lessons learnt from the regulation of the Norwegian salmon river, Suldalslågen." River Research and Applications , no. : 1.

Journal article
Published: 01 December 2016 in Science of The Total Environment
Reads 0
Downloads 0
ACS Style

Roser Casas-Mulet; Svein Jakob Saltveit; Knut Tore Alfredsen. Hydrological and thermal effects of hydropeaking on early life stages of salmonids: A modelling approach for implementing mitigation strategies. Science of The Total Environment 2016, 573, 1660 -1672.

AMA Style

Roser Casas-Mulet, Svein Jakob Saltveit, Knut Tore Alfredsen. Hydrological and thermal effects of hydropeaking on early life stages of salmonids: A modelling approach for implementing mitigation strategies. Science of The Total Environment. 2016; 573 ():1660-1672.

Chicago/Turabian Style

Roser Casas-Mulet; Svein Jakob Saltveit; Knut Tore Alfredsen. 2016. "Hydrological and thermal effects of hydropeaking on early life stages of salmonids: A modelling approach for implementing mitigation strategies." Science of The Total Environment 573, no. : 1660-1672.

Journal article
Published: 02 February 2016 in Fisheries Management and Ecology
Reads 0
Downloads 0

During their early life stages (egg maturation, hatching, alevin development), between late autumn and early spring, young Atlantic salmon are exposed to surface-groundwater interactions in the hyporheic zone and may depend on influx of subsurface water during periods of regulated low discharge for survival. Two studies, one in a seasonally regulated river and one in a river exposed to hydropeaking, displayed unexpectedly high survival of eggs in surface de-watered areas because of the influx of oxygen-rich subsurface water. Field observations of newly hatched alevins in these two rivers showed them to be more sensitive (i.e. suffered higher mortality from) to surface de-watering than were eggs. Exposure to dry conditions in drawdown areas was highlighted as the main cause for alevin mortality. Therefore, shorter periods of surface de-watering in the river with hydropeaking resulted in higher alevin survival than the seasonally regulated river when still permanently drained after egg hatching. Greater consideration should be given to all early life-history stages when implementing discharge release strategies, and the extent of groundwater influence and the potential for flexible hydropower operations should be taken into account.

ACS Style

R. Casas-Mulet; K. Alfredsen; Å. Brabrand; S. J. Saltveit. Hydropower operations in groundwater-influenced rivers: implications for Atlantic salmon, Salmo salar , early life stage development and survival. Fisheries Management and Ecology 2016, 23, 144 -151.

AMA Style

R. Casas-Mulet, K. Alfredsen, Å. Brabrand, S. J. Saltveit. Hydropower operations in groundwater-influenced rivers: implications for Atlantic salmon, Salmo salar , early life stage development and survival. Fisheries Management and Ecology. 2016; 23 (2):144-151.

Chicago/Turabian Style

R. Casas-Mulet; K. Alfredsen; Å. Brabrand; S. J. Saltveit. 2016. "Hydropower operations in groundwater-influenced rivers: implications for Atlantic salmon, Salmo salar , early life stage development and survival." Fisheries Management and Ecology 23, no. 2: 144-151.

Journal article
Published: 15 May 2013 in River Research and Applications
Reads 0
Downloads 0

Most rivers and streams in the city of Oslo, Norway, rise in the surrounding forests, and all run through industrial and urban areas before they reach the sea. Most of these rivers have a long history of poor water quality in the middle and lower reaches until the early 1980s. This was reflected in low benthic diversity and the absence of fish. However, at the end of the 1970s, considerable efforts were made to limit industrial discharges, pollution episodes, and urban runoff, resulting in a substantial improvement in water quality. This improvement in water quality resulted in major changes in the benthos and fish populations of the rivers, especially the river Akerselva, which runs through the city centre. Here Atlantic salmon (Salmo salar) became extinct in the mid‐1800s and did not return until 1983. Atlantic salmon and sea trout (Salmo trutta) now spawn in the lower reaches, and the river supports juvenile populations of these salmonids. In line with the improvement in water quality, benthic biodiversity has also increased. These improvements have been documented based on long‐term monitoring of benthos and fish. Increased benthic diversity and presence of fish also enabled the authorities to trace the source of several pollution episodes that led to fish kills. The European Union Water Framework Directive will bring further pressure to maintain a stable and good ecological status for the Oslo rivers, although it may be difficult to attain this goal in an urban environment. Copyright © 2013 John Wiley & Sons, Ltd.

ACS Style

S. J. Saltveit; J. E. Brittain; T. Bremnes; Å. Brabrand; T. Baekken. THE RETURN OF ATLANTIC SALMON (SALMO SALAR L.) AND IMPROVED WATER QUALITY IN URBAN RIVERS IN OSLO, NORWAY. River Research and Applications 2013, 30, 571 -577.

AMA Style

S. J. Saltveit, J. E. Brittain, T. Bremnes, Å. Brabrand, T. Baekken. THE RETURN OF ATLANTIC SALMON (SALMO SALAR L.) AND IMPROVED WATER QUALITY IN URBAN RIVERS IN OSLO, NORWAY. River Research and Applications. 2013; 30 (5):571-577.

Chicago/Turabian Style

S. J. Saltveit; J. E. Brittain; T. Bremnes; Å. Brabrand; T. Baekken. 2013. "THE RETURN OF ATLANTIC SALMON (SALMO SALAR L.) AND IMPROVED WATER QUALITY IN URBAN RIVERS IN OSLO, NORWAY." River Research and Applications 30, no. 5: 571-577.

Journal article
Published: 03 May 2013 in River Research and Applications
Reads 0
Downloads 0
ACS Style

Å. Brabrand; T. Bremnes; A. G. Koestler; G. Marthinsen; H. Pavels; Eirik Rindal; J. E. Raastad; S. J. Saltveit; A. Johnsen. MASS OCCURRENCE OF BLOODSUCKING BLACKFLIES IN A REGULATED RIVER REACH: LOCALIZATION OF OVIPOSITION HABITAT OF SIMULIUM TRUNCATUM USING DNA BARCODING. River Research and Applications 2013, 30, 602 -608.

AMA Style

Å. Brabrand, T. Bremnes, A. G. Koestler, G. Marthinsen, H. Pavels, Eirik Rindal, J. E. Raastad, S. J. Saltveit, A. Johnsen. MASS OCCURRENCE OF BLOODSUCKING BLACKFLIES IN A REGULATED RIVER REACH: LOCALIZATION OF OVIPOSITION HABITAT OF SIMULIUM TRUNCATUM USING DNA BARCODING. River Research and Applications. 2013; 30 (5):602-608.

Chicago/Turabian Style

Å. Brabrand; T. Bremnes; A. G. Koestler; G. Marthinsen; H. Pavels; Eirik Rindal; J. E. Raastad; S. J. Saltveit; A. Johnsen. 2013. "MASS OCCURRENCE OF BLOODSUCKING BLACKFLIES IN A REGULATED RIVER REACH: LOCALIZATION OF OVIPOSITION HABITAT OF SIMULIUM TRUNCATUM USING DNA BARCODING." River Research and Applications 30, no. 5: 602-608.

Journal article
Published: 01 June 2006 in Fisheries Management and Ecology
Reads 0
Downloads 0

Stocking is undertaken in the River Suldalslågen, western Norway, to compensate for an estimated annual loss of 20 000 Atlantic salmon smolts, Salmo salar L., caused by regulating the river for hydropower production. The annual contribution to angling catches from stocked hatchery fish varied from 7 to 334 kg, or <15% of the total number caught. Between 160 000 and 250 000 one‐summer old fish were stocked, but only between 6 and 10 (<0.005%) were recaptured as adults in the river. Recaptured stocked fish never exceeded 0.03% by number, despite smolts dominating the stocking material in recent years. It is not certain whether the slight increase in catches comes in addition to or at the expense of natural reproduction. In most years more adults were used as parent stock than were caught as offspring. The lack of positive response to stocking is possibly due to lesser age, smaller size and later migration of hatchery smolts, and that seawater tolerance of hatchery smolts is poorly developed, all factors increasing mortality at sea.

ACS Style

S. J. Saltveit. The effects of stocking Atlantic salmon, Salmo salar, in a Norwegian regulated river. Fisheries Management and Ecology 2006, 13, 197 -205.

AMA Style

S. J. Saltveit. The effects of stocking Atlantic salmon, Salmo salar, in a Norwegian regulated river. Fisheries Management and Ecology. 2006; 13 (3):197-205.

Chicago/Turabian Style

S. J. Saltveit. 2006. "The effects of stocking Atlantic salmon, Salmo salar, in a Norwegian regulated river." Fisheries Management and Ecology 13, no. 3: 197-205.

Article
Published: 01 December 2001 in Freshwater Biology
Reads 0
Downloads 0

1. Invertebrate drift was studied in a glacially fed river and a non-glacial tributary in western Norway. Samples were taken during two consecutive 24-h periods in May, July and October 1997. The 3 months are characterized by snowmelt, ice melt and rainfall runoff, respectively. The main glacial river has colder, more turbid water, especially during the period of maximum ice melt during summer. 2. Chironomidae, especially the genus Diamesa, dominated the drift in the main river in May and October, constituting 97 and 99% of total numbers, respectively. Simuliidae, Plecoptera, Ephemeroptera and Trichoptera were the other main components. 3. A comparison of drift and benthos data revealed that the tributary was of little significance for colonization of the main glacial river. Only some additional species in very low numbers were recorded downstream of the confluence. 4. During July significant differences in diel drift pattern of Chironomidae and Simuliidae existed between the glacial and non-glacial reaches. There was a mid-day peak independent of discharge in the glacial river, but this peak was not noted in the tributary. Species of the genus Diamesa appear to be adapted for daytime drift, possibly evolved through the absence of predators and competitors that are typical of rhithral systems where nocturnal drift is more usual.

ACS Style

S. J. Saltveit; I. Haug; J. E. Brittain. Invertebrate drift in a glacial river and its non-glacial tributary. Freshwater Biology 2001, 46, 1777 -1789.

AMA Style

S. J. Saltveit, I. Haug, J. E. Brittain. Invertebrate drift in a glacial river and its non-glacial tributary. Freshwater Biology. 2001; 46 (12):1777-1789.

Chicago/Turabian Style

S. J. Saltveit; I. Haug; J. E. Brittain. 2001. "Invertebrate drift in a glacial river and its non-glacial tributary." Freshwater Biology 46, no. 12: 1777-1789.

Journal article
Published: 01 December 1995 in Ecology of Freshwater Fish
Reads 0
Downloads 0

– Downstrcam displacement of salmonid fry due to flow increase, from 12–15 m3/s to >100 m3s, was documented in the river Suldalslåen, Western Norway. In May only fry of brown trout (Sulmo trutta) occurred in the drift, while from the beginning of June only newly emerged Atlantic salmon (Sulmo sular) were found. The maximum number of Atlantic salmon fry drifting during a single day was estimated to be 17 000 individual. Their density in the drift was higher during the night than during the day, and their appearance in the drift coincided with the predicted period of emergence. Total brown trout numbers in the drift were estimated to vary between 4000 and 16 000 per day. Fry displaced downstream from the lowermost part of the river were lost from the population. The total losses were estimated to be between 75 000 and 100 000 Atlantic salmon fry which represents between 5.6 and 11.1%) of juvenile mortality during the first year of life.

ACS Style

S. J. Saltveit; T. Bremnes; O. R. Lindå. Effect of sudden increase in discharge in a large river on newly emerged Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) fry. Ecology of Freshwater Fish 1995, 4, 168 -174.

AMA Style

S. J. Saltveit, T. Bremnes, O. R. Lindå. Effect of sudden increase in discharge in a large river on newly emerged Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) fry. Ecology of Freshwater Fish. 1995; 4 (4):168-174.

Chicago/Turabian Style

S. J. Saltveit; T. Bremnes; O. R. Lindå. 1995. "Effect of sudden increase in discharge in a large river on newly emerged Atlantic salmon (Salmo salar) and brown trout (Salmo trutta) fry." Ecology of Freshwater Fish 4, no. 4: 168-174.