Article
Ecology
Hannele M. Honkanen, Danielle L. Orrell, Matthew Newton, Simon McKelvey, Alastair Stephen, R. Alistair Duguid, Colin E. Adams
Summary: The study found that the success rate of Atlantic salmon migration through standing waters is generally low, possibly due to a lack of navigational cues. The impact of impounded lakes on Atlantic salmon migration is not significantly different from that of naturally draining lakes, and may depend more on factors such as lake basin shape, exit route, and navigational cues available to the fish.
ECOLOGICAL ENGINEERING
(2021)
Article
Engineering, Marine
Katharine B. Miller, Courtney M. Weiss
Summary: Migration phenology plays a significant role in ecological processes, particularly for Pacific salmon. Understanding how variations in phenology change with environmental heterogeneity is crucial, especially for high-latitude rivers where climate change is occurring rapidly. This research examines the influence of river conditions on the migration phenology of Chinook, chum, and coho salmon in the Yukon River, identifying species-specific differences and their implications for survival.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Review
Oceanography
Skip McKinnell, James R. Irvine
Summary: The study investigated the relationship between ocean indicators and survival rates of certain salmon species, as well as the potential role of primary productivity phenology in explaining variations in marine survival rates. The findings suggested possible correlations but were inconclusive, highlighting the need for further research in this area.
PROGRESS IN OCEANOGRAPHY
(2021)
Article
Ecology
Olivia M. Simmons, Stephen D. Gregory, Phillipa K. Gillingham, William D. Riley, Luke J. Scott, J. Robert Britton
Summary: This study investigated the impacts of various biological and environmental factors on the migration timing of individual Atlantic salmon smolts. It found that warmer winters, daily changes in water temperature and discharge, as well as the location and size of the smolts influenced their migration timing. The results highlight the importance of considering a wide range of variables in understanding and predicting the phenology of smolt migrations.
FRESHWATER BIOLOGY
(2021)
Article
Biology
Lisa G. Crozier, Brian J. Burke, Brandon E. Chasco, Daniel L. Widener, Richard W. Zabel
Summary: Widespread declines in Atlantic and Pacific salmon have been attributed to recent climate changes, with a lack of quantitative projections on the viability of individual populations. Research on threatened Chinook salmon populations showed rapid declines in response to increasing sea surface temperatures, highlighting the need for increased conservation efforts to improve smolt survival rates in order to overcome the negative impacts of climate change.
COMMUNICATIONS BIOLOGY
(2021)
Article
Fisheries
Abdullah Sami Madhun, Rune Nilsen, Bjorn T. Barlaup, Orjan Karlsen, Egil Karlsbakk
Summary: Viral diseases pose a serious threat to Atlantic salmon farming in Norway, causing reduced fish welfare and increased mortality. In this study, the occurrence of salmonid alphavirus (SAV) and piscine orthoreovirus-1 (PRV-1) infections in migrating salmon post-smolt from three fjords in western Norway was investigated. It was found that SAV was not detected, while PRV-1 was present in 4.6% of the tested post-smolt. The prevalence of PRV-1 was higher in wild post-smolt compared to hatchery-released ones.
JOURNAL OF FISH DISEASES
(2023)
Article
Fisheries
Shohei Noda, Rui Ueda, Tatsuya Tanaka, Kotaro Shirai, Daisuke Kishi, Takuya Sato
Summary: The anadromous form of red-spotted masu salmon in two Japanese rivers showed low variation in sea migratory patterns, making them likely vulnerable to environmental fluctuations.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Environmental Sciences
Andrew B. Harbicht, P. Anders Nilsson, Martin Osterling, Olle Calles
Summary: Through observing the passage of radio-tagged Atlantic salmon smolts through nine river sections, this study found that migration rates are primarily influenced by physical river properties, biological traits, and seasonal variables rather than anthropogenic factors. The negative impact of reservoirs may be mainly due to their influence on river width, and spilling water as a mitigative measure can reduce delays. However, the effects of dams on migratory fish species may still be observed due to passage effects.
RIVER RESEARCH AND APPLICATIONS
(2021)
Article
Agriculture, Dairy & Animal Science
Renate Kvingedal, Jannicke Vigen, Dominic Nanton, Kari Ruohonen, Kiranpreet Kaur
Summary: Optimal nutrition is crucial for the early seawater phase of Norwegian-farmed Atlantic salmon, which faces higher mortality and economic losses. Phospholipids have been found to enhance growth, survival, and health in the early stages of the fish life. This study evaluated different phospholipid sources in freshwater and observed increased weight gain with higher doses of krill meal but decreased growth with soy lecithin. Liver histology showed no major differences between different phospholipid sources, but there was a minor positive trend in gill health associated with krill meal and control diets.
Article
Biology
Michelle Y. Monette, Jonathan P. Velotta
Summary: This study investigates the physiological challenge and molecular mechanisms underlying the transition from freshwater to seawater in Atlantic salmon smolts. By combining RNA-Seq with measures of whole-animal homeostasis, the researchers found that exposure to acute stress impairs the ability of smolts to maintain osmotic/ionic balance in seawater, but increases the expression of genes related to ion transport.
JOURNAL OF EXPERIMENTAL BIOLOGY
(2022)
Article
Fisheries
Ingrid A. Johnsen, Alison Harvey, Pal Naeverlid Saevik, Anne D. Sandvik, Ola Ugedal, Bjorn Adlandsvik, Vidar Wennevik, Kevin A. Glover, Orjan Karlsen
Summary: This study focused on the environmental challenges of salmonid aquaculture, estimating the impact of salmon lice on wild salmon mortality in Norwegian waters using models and data analysis. Results showed that aquaculture-produced salmon lice led to varying mortality rates of wild salmon post-smolts in different rivers.
ICES JOURNAL OF MARINE SCIENCE
(2021)
Article
Fisheries
Brady K. Quinn, Marc Trudel, Brent M. Wilson, Jonathan Carr, Jason Daniels, Susan Haigh, David C. Hardie, James P. Hawkes, Christopher W. McKindsey, Mitchell O'Flaherty-Sproul, Emilie Simard, Fred Page
Summary: This study used a biophysical model coupled with a water circulation model to simulate the dispersal of Atlantic salmon post-smolts in Passamaquoddy Bay. Different behaviors and swimming speeds were tested, and some behaviors were found to allow salmon to successfully leave the bay and match observation data reasonably well.
CANADIAN JOURNAL OF FISHERIES AND AQUATIC SCIENCES
(2022)
Article
Ecology
Brian Kastl, Mariska Obedzinski, Stephanie M. Carlson, William T. Boucher, Theodore E. Grantham
Summary: Understanding the impact of drought caused by climate change on migration windows is crucial for biodiversity conservation. A study on endangered coho salmon in California found that drought reduces the migration window and may lead to decreased fitness and population stability.
Article
Fisheries
Petri Karppinen, Mikko Hynninen, Teppo Vehanen, Juha-Pekka Vaha
Summary: The study investigated migration behavior, route selection, and mortality of Atlantic salmon smolts in four hydroelectric facilities in the River Mustionjoki, Finland. Findings indicated a general downstream movement tendency of smolts, but variable behavior and mortality rates were observed due to diverse conditions at each power station. Essential information on behavior and mortality in relation to local conditions at each power station was provided for successful application of fish bypass systems in a salmon restoration project.
FISHERIES MANAGEMENT AND ECOLOGY
(2021)
Article
Ecology
Marta E. Ulaski, Heather Finkle, Anne H. Beaudreau, Peter A. H. Westley
Summary: Predicting the effects of climate on fitness-linked phenotypic traits, such as body size, is essential for species management and conservation. The study found population-specific responses to temperature and density in Pacific salmon, suggesting that local habitat conditions may play a role in filtering larger-scale climate drivers.
FRESHWATER BIOLOGY
(2022)
Article
Fisheries
R. D. Hedger, A. H. Rikardsen, E. B. Thorstad
JOURNAL OF FISH BIOLOGY
(2017)
Article
Fisheries
R. D. Hedger, R. M. Serra-Llinares, P. Arechavala-Lopez, R. Nilsen, P. A. Bjorn, I. Uglem
FISHERIES MANAGEMENT AND ECOLOGY
(2017)
Article
Marine & Freshwater Biology
Torgeir B. Havn, Eva B. Thorstad, Maxim A. K. Teichert, Stein A. Sther, Lisa Heermann, Richard D. Hedger, Meelis Tambets, Ola H. Diserud, Jost Borcherding, Finn Okland
Article
Ecology
Richard D. Hedger, Julian Sauterleute, Line E. Sundt-Hansen, Torbjorn Forseth, Ola Ugedal, Ola H. Diserud, Tor H. Bakken
Correction
Fisheries
J. R. Paris, K. D. Sherman, E. Bell, C. Boulenger, C. Delord, M. B. El-Mahdi, E. A. Fairfield, A. M. Griffiths, Gutmann C. Roberts, R. D. Hedger, L. E. Holman, L. H. Hooper, N. E. Humphries, I. Katsiadaki, R. A. King, A. Lemopoulos, C. J. Payne, G. Peirson, K. K. Richter, M. I. Taylor, C. N. Trueman, B. Hayden, J. R. Stevens
JOURNAL OF FISH BIOLOGY
(2018)
Article
Fisheries
J. R. Paris, K. D. Sherman, E. Bell, C. Boulenger, C. Delord, M. B. M. El-Mahdi, E. A. Fairfield, A. M. Griffiths, C. Gutmann Roberts, R. D. Hedger, L. E. Holman, L. H. Hooper, N. E. Humphries, I. Katsiadaki, R. A. King, A. Lemopoulos, C. J. Payne, G. Peirson, K. K. Richter, M. I. Taylor, C. N. Trueman, B. Hayden, J. R. Stevens
JOURNAL OF FISH BIOLOGY
(2018)
Article
Environmental Sciences
L. E. Sundt-Hansen, R. D. Hedger, O. Ugedal, O. H. Diserud, A. G. Finstad, J. F. Sauterleute, L. Tofte, K. Alfredsen, T. Forseth
SCIENCE OF THE TOTAL ENVIRONMENT
(2018)
Article
Fisheries
Richard D. Hedger, Ola H. Diserud, Odd T. Sandlund, Laila Saksgard, Ola Ugedal, Gunnbjorn Bremset
FISHERIES RESEARCH
(2018)
Article
Fisheries
Chelsey M. Karbowski, Bengt Finstad, Niklas Karbowski, Richard D. Hedger
AQUACULTURE ENVIRONMENT INTERACTIONS
(2019)
Article
Computer Science, Interdisciplinary Applications
Ana Adeva-Bustos, Richard David Hedger, Hans-Petter Fjeldstad, Morten Stickler, Knut Alfredsen
ENVIRONMENTAL MODELLING & SOFTWARE
(2019)
Article
Ecology
R. D. Hedger, M. Kjellman, E. B. Thorstad, J. F. Strom, A. H. Rikardsen
Summary: This study examined the diving behavior and feeding habits of post-spawner Atlantic salmon from a population in northern Norway. The findings showed that tagged individuals migrated through surface waters and performed periodic dives, with differences in diving behavior between the fjord and outer coast. The stomach content analysis of salmon captured in the fjord indicated a lack of recent feeding.
ENVIRONMENTAL BIOLOGY OF FISHES
(2022)
Article
Ecology
Richard D. Hedger, Line E. Sundt-Hansen, Ana Juarez-Gomez, Knut Alfredsen, Anders Foldvik
Summary: This study used a mechanistic modelling approach to examine the impact of hydropeaking on fish stranding mortality. By modelling the hydropeaking in the River Nidelva, central Norway, it was found that stranding mortality was strongly dependent on the form of the hydropeaking cycle and the fish response. The down-ramping speed had a greater impact on total stranding mortality than the duration of the minimum flow period. Further controlled studies are needed to parameterize models for predicting the effects of hydropeaking on fish.
Article
Environmental Sciences
Richard D. Hedger, Marie-Pierre Gosselin
Summary: Mapping fluvial hydromorphology directly from remote sensing data using a deep learning classification scheme offers a quick and efficient solution. This study presents an automated system that classifies surface flow patterns in rivers based on aerial orthophotos using a trained convolutional neural network. The classified flow patterns, combined with channel gradient information from LiDAR data, are used to create hydromorphological units representing dominant flow features. The automated classifications were consistent with manual classifications and showed the temporal dynamics of hydromorphology. The proposed system is flexible and can be further improved by incorporating additional remote sensing methods.
RIVER RESEARCH AND APPLICATIONS
(2023)
Article
Ecology
Karl O. Gjelland, Richard D. Hedger
METHODS IN ECOLOGY AND EVOLUTION
(2017)
Article
Economics
Ana Adeva Bustos, Richard David Hedger, Hans-Petter Fjeldstad, Knut Alfredsen, Hakon Sundt, David Nicholas Barton
WATER RESOURCES AND ECONOMICS
(2017)