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
Fisheries
Ragnhild O. Fossmark, Kari J. K. Attramadal, Kristian Nordoy, Stein W. Osterhus, Olav Vadstein
Summary: The land-based production phase in Norwegian Atlantic salmon farming has been expanded in recent years to include post-smolt for more farmers. Research on salinity increase in a recirculating aquaculture system (RAS) showed stability in bacterial communities at different salinities, high inter-individual variation in fish gut microbiota, and adaptability of nitrifying bacteria to different salinities. Salinity was identified as a driver for succession in RAS, with other factors such as organic load and stochastic processes also influencing bacterial community dynamics.
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
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
K. Dronen, I. Roalkvam, H. Nilsen, A. B. Olsen, H. Dahle, H. Wergeland
Summary: The presence and abundance of pathogenic bacteria in a marine post-smolt RAS were studied using a refined 16S rRNA gene library approach. Different pathogen relatives were detected in various habitats within the RAS, with their abundances changing over time and in response to operational conditions. The fish skin and production water were identified as the best sampling sites for early warning and screening of pathogens.
AQUACULTURE REPORTS
(2022)
Article
Fisheries
N. H. Sissener, K. Hamre, P. G. Fjelldal, A. J. P. Philip, M. Espe, L. Miao, E. Hoglund, C. Sorensen, K. H. Skjaerven, E. Holen, S. Subramanian, V. Vikesa, B. Norberg, S. C. Remo
Summary: The loss of fish in the seawater phase of Atlantic salmon farming is high, but improvements made to the freshwater diet do not greatly affect fish growth and survival in the seawater phase. Direct transfer to seawater at a lower temperature than the fish has been acclimated to is not recommended. There were no significant differences in health- or welfare related parameters between the diet groups.
Article
Fisheries
Thomas W. K. Fraser, Tom J. Hansen, Birgitta Norberg, Tom Ole Nilsen, Ruediger W. Schulz, Per Gunnar Fjelldal
Summary: Photoperiod has an effect on the occurrence of unwanted male post-smolt maturation in large Atlantic salmon smolts. The optimal daylength for triggering smoltification without male puberty has not been determined. The study found that continuous light resulted in a higher incidence of male puberty compared to long days. It concluded that a photoperiod with a short scotophase is recommended to limit the incidence of male puberty.
Article
Fisheries
Raneesha de Fonseka, Per Gunnar Fjelldal, Florian Sambraus, Tom Ole Nilsen, Sofie C. Remo, Lars H. Stien, Helena C. Reinardy, Angelico Madaro, Tom J. Hansen, Thomas W. K. Fraser
Summary: The study found that the growth of triploid Atlantic salmon in seawater cultivation is significantly affected by salinity, but the effects depend on ploidy. In addition, there is a mismatch between triploids and diploids in smoltification biomarkers and growth.
Article
Fisheries
Antony J. Prabhu Philip, Per Gunnar Fjelldal, Sofie C. Remo, Chandrasekar Selvam, Kristin Hamre, Marit Espe, Elisabeth Holen, Kaja H. Skjaerven, Vibeke Viksa, Saravanan Subramanian, Johan W. Schrama, Nini H. Sissener
Summary: The study showed that modulating the electrolyte and/or mineral balance in freshwater feeds can pre-adapt mineral metabolism and intestinal response to seawater transfer in Atlantic salmon. Additionally, the dietary electrolyte balance did not affect the long term development of cataract or vertebral deformities.
Article
Fisheries
Signe Dille Lovmo, Henrik Sundh, Paul Whatmore, Malene Fosse Nordvi, Trygve Sigholt, Angelico Madaro, Tora Bardal, Rolf Erik Olsen
Summary: The study found that feeding Atlantic salmon a high EPA diet improved intestinal health, while low HUFA fed fish had lower energy utilization. Chronic stress led to intestinal barrier damage and inflammation.
Article
Engineering, Marine
Brian G. Sanderson, Richard H. Karsten, Cameron C. Solda, David C. Hardie, Daniel J. Hasselman
Summary: This study uses acoustic telemetry to quantify the probability of encounters between salmon and marine hydrokinetic (MHK) turbines in Minas Passage, Bay of Fundy.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2023)
Article
Fisheries
Signe Dille Lovmo, Paul Whatmore, Henrik Sundh, Trygve Sigholt, Angelico Madaro, Tora Bardal, Rolf Erik Olsen
Summary: This study investigates the dietary needs and benefits of highly unsaturated fatty acids (HUFA) for Atlantic salmon, finding that a low HUFA diet can sustain growth and intestinal health under controlled conditions but is impaired after chronic stress. Increasing levels of EPA and DHA can strengthen the intestinal barrier response to chronic stress.
Article
Multidisciplinary Sciences
Mariann Eilertsen, Benjamin G. J. Clokie, Lars O. E. Ebbesson, Cristina Tanase, Herve Migaud, Jon Vidar Helvik
Summary: Photoreceptive inputs to the teleost brain are perceived as images of the visual world and modulation of neuroendocrine and neuronal signals. This study tested the effects of narrow bandwidth light on brain neural activity in Atlantic salmon, revealing an increase in c-fos expression and activation of specific brain regions following light stimulation. The overlapping expression patterns of c-fos and nonvisual opsins suggest a direct light stimulation of deep brain photoreceptors.
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)