Article
Agriculture, Dairy & Animal Science
Callum Howard, John F. Taylor, Herve Migaud, Alejandro P. Gutierrez, Michael Bekaert
Summary: Diploid and triploid Atlantic salmon have physiological differences, but no significant difference was found in their rate of embryogenesis. However, triploids hatch more quickly and have a higher rate of mortality.
Article
Multidisciplinary Sciences
Silvia Martinez-Llorens, Stefano Peruzzi, Inger-Britt Falk-Petersen, Sergio Godoy-Olmos, Lars Olav Ulleberg, Ana Tomas-Vidal, Velmurugu Puvanendran, Derrick Kwame Odei, Orjan Hagen, Jorge M. O. Fernandes, Malcolm Jobling
Summary: Triploid, sterile Atlantic salmon could contribute to the farming industry, but uncertainties about their performance and welfare have limited their adoption by farmers. This study compared the digestive tract morphology and enzyme activities of diploid and triploid Atlantic salmon, finding that triploid salmon had lower digestibility of amino acids and no significant differences in proteolytic enzyme activities compared to diploids. The study also suggested that trypsin-to-chymotrypsin activity ratios could potentially predict recent growth history and growth potential in salmon.
Article
Fisheries
Martina Bortoletti, Lisa Maccatrozzo, Stefano Peruzzi, Jo Espen Tau Strand, Malcolm Jobling, Giuseppe Radaelli, Daniela Bertotto
Summary: A study assessed the impact of diet on the growth and welfare of diploid and triploid Atlantic salmon during the parr-smolt transformation. The results showed that the diet did not have a significant effect on the performance and welfare of the fish.
AQUACULTURE REPORTS
(2022)
Article
Fisheries
Michael Clarkson, John Frank Taylor, Elsbeth McStay, Matthew John Palmer, Benjamin Gregory James Clokie, Herve Migaud
Summary: The study investigated the effects of temperature shifts during embryogenesis on diploid and triploid Atlantic salmon embryo development and juvenile skeletal deformities, finding that lower incubation temperatures may promote better overall performance but impact the expression of important developmental genes.
AQUACULTURE RESEARCH
(2021)
Article
Fisheries
Malene Fosse Nordvi, Signe Dille Lovmo, Ingeborg Hollekim Bringslid, Paul Whatmore, Henrik Sundh, Kjell Inge Reitan, Finn Lillelund Aachmann, Rolf Erik Olsen
Summary: Using functional feed ingredients, such as fucoidans from marine macroalgae, can enhance the intestinal health and immune regulation of Atlantic salmon (Salmo salar). In this trial, Atlantic salmon post-smolts were fed diets with different levels of fucoidan to alleviate low-level intestinal inflammation caused by a soya diet. The addition of fucoidan improved intestinal integrity and reduced inflammation in the hind intestine of the fish.
Article
Fisheries
Ashild Krogdahl, Anusha K. S. Dhanasiri, Aleksei Krasnov, Violetta Aru, Elvis M. Chikwati, Gerd M. Berge, Soren Balling Engelsen, Trond M. Kortner
Summary: Functional feed ingredients are commonly used in feeds for Atlantic salmon to improve immune functions and reduce gut inflammation. However, their effectiveness is often uncertain. This study evaluated the effects of two packages of functional feed ingredients on inflammation models in salmon. The results showed that the inclusion of these ingredients did not significantly alleviate inflammation in salmon fed soybean meal, but they did alter the microbiota composition. The overall importance of this study is 9 out of 10.
FISH & SHELLFISH IMMUNOLOGY
(2023)
Article
Ecology
Emily Corey, Tommi Linnansaari, Richard A. A. Cunjak
Summary: Summer water temperatures exceeding lethal levels for juvenile Atlantic salmon result in abandonment of territory in favor of cooler thermal refuges. This study investigates the impact of thermal refuges on abundance patterns of salmon parr at a river scale. Results show a significant increase in the relative abundance of parr in reaches with thermal refuges after high temperature events in 2012, indicating a preference for cooler refuges. This highlights the critical role of river-wide thermal heterogeneity for the survival of juvenile salmon in summer, especially in the face of climate change.
FRESHWATER BIOLOGY
(2023)
Article
Biotechnology & Applied Microbiology
Soren B. Hansen, Davide Bozzi, Sarah S. T. Mak, Cecilie G. Clausen, Tue K. Nielsen, Miyako Kodama, Lars H. Hansen, M. Thomas P. Gilbert, Morten T. Limborg
Summary: Obtaining desired phenotypic traits in aquacultural production of Atlantic salmon is still a challenge, and the presence of host-associated microorganisms might contribute to this challenge. Understanding the factors that shape the microbiota is crucial for manipulating it towards desired host traits. In this study, DNA methylation differences associated with a tenacibaculosis outbreak and microbiota displacement in Atlantic salmon were investigated, revealing potential genes involved in host-microbiota interactions and the importance of considering epigenetic factors in manipulating farmed fish microbiota.
Article
Fisheries
Thomas W. K. Fraser, Hilde Leroy, Tom J. Hansen, Jon Egil Skjaeraasen, Valentina Tronci, Cindy P. Pedrosa, Per Gunnar Fjelldal, Tom Ole Nilsen
Summary: The study indicates that triploid Atlantic salmon and hybrid strains show enhanced growth performance compared to diploid salmon in an aquaculture setting, making them more suitable for commercial breeding.
Article
Fisheries
Arnfinn Aunsmo, Lisbeth Martinsen, Torkjel Bruheim, Mats Martin Sekkelsten-Kindt, Ane Sandtro, Solveig Gaaso, Stine Braaen, Espen Rimstad
Summary: The present study found that triploid Atlantic salmon are more susceptible to infectious salmon anaemia (ISA), which increases the risk of ISA outbreaks. It is recommended to separate triploid and diploid fish in farming or not farm triploid fish at all.
JOURNAL OF FISH DISEASES
(2022)
Article
Fisheries
Malene Fosse Nordvi, Signe Dille Lovmo, Paul Whatmore, Henrik Sundh, Trygve Sigholt, Rolf Erik Olsen
Summary: Moderate levels of intestinal damage and inflammation are common in intensive fish aquaculture. This study investigated the use of soybean HP48 as a low-inflammation model and the potential of the probiotic Bactocell to mitigate the effects. The results suggest that HP48 disrupts mid-intestinal homeostasis, but this can be reversed by Bactocell supplementation.
Article
Microbiology
Maria F. Morales-Rivera, Diego Valenzuela-Miranda, Gustavo Nunez-Acuna, Barbara P. Benavente, Cristian Gallardo-Escarate, Valentina Valenzuela-Munoz
Summary: This study explored the diversity and abundance of the Atlantic salmon intestinal microbiota and metagenome functional prediction during seawater transfer under three treatments. The results showed an influence of salinity changes on Atlantic salmon gut microbiota richness, diversity, and taxonomic composition. The reported knowledge can be applied to surveil the microbiome in smolt fish production, improving the performance of Atlantic salmon to seawater transfer.
Article
Fisheries
Morten Omholt Alver, Martin Fore, Jo Arve Alfredsen
Summary: The research team developed a mathematical model based on the advection-diffusion equation to predict dissolved oxygen levels in fish sea cages. The model was tested in a large production unit and performed well, but may require more detailed information on fish behavior and current conditions within the cages to improve accuracy.
Article
Fisheries
Lucia Drabikova, Per Gunnar Fjelldal, Adelbert De Clercq, M. Naveed Yousaf, Thea Morken, Charles McGurk, P. Eckhard Witten
Summary: The study examines how deficiencies and excess of dietary phosphorus influence the structure and microstructure of vertebral bodies in juvenile Atlantic salmon. Results show that a phosphorus-deficient diet can impact the bone mineral content in the abdominal vertebrae, but growth and bone formation continue at the same rate as in those fed regular and high phosphorus diets. This suggests that under continuous feeding, a phosphorus-reduced diet may not have adverse effects on growth in Atlantic salmon. The study also indicates that a high phosphorus diet relative to a regular phosphorus diet does not have any beneficial effects in terms of bone formation and prevention of vertebral column deformities in Atlantic salmon parr.
Article
Veterinary Sciences
Susan Jarvis, Maureen A. Ellis, James F. Turnbull, Sonia Rey Planellas, Francoise Wemelsfelder
Summary: There is a growing consensus that fish are sentient beings capable of experiencing pain and suffering, leading to the challenge of assessing the welfare of farmed fish. This study explores the use of Qualitative Behavioral Assessment (QBA) as a potential tool for monitoring the welfare of farmed salmon. The results show promise in using QBA to efficiently assess the welfare of juvenile salmon under farmed conditions.
FRONTIERS IN VETERINARY SCIENCE
(2021)
Article
Environmental Sciences
Alexandra M. Hudecova, Kristine E. A. Hansen, Siddhartha Mandal, Hanne F. Berntsen, Abdolrahman Khezri, Tracy L. Bale, Thomas W. K. Fraser, Karin E. Zimmer, Erik Ropstad
Article
Environmental Sciences
Abdolrahman Khezri, Juan G. Herranz-Jusdado, Erik Ropstad, Thomas W. K. Fraser
ENVIRONMENTAL POLLUTION
(2018)
Article
Fisheries
Per Gunnar Fjelldal, Terje van der Meeren, Thomas W. K. Fraser, Florian Sambraus, Laith Jawad, Tom Johnny Hansen
JOURNAL OF FISH DISEASES
(2018)
Article
Biochemistry & Molecular Biology
Thomas W. K. Fraser, Per Gunnar Fjelldal, Riidiger W. Schulz, Birgitta Norberg, Tom J. Hansen
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2019)
Article
Fisheries
Thomas W. K. Fraser, P. Eckhard Witten, Sissel Albrektsen, Olav Breck, Ramon Fontanillas, Leo Nankervis, Tarn Helgoy Thomsen, Wolfgang Koppe, Florian Sambraus, Per Gunnar Fjelldal
Correction
Biochemistry & Molecular Biology
Thomas W. K. Fraser, Per Gunnar Fjelldal, Rudiger W. Schulz, Birgitta Norberg, Tom J. Hansen
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY A-MOLECULAR & INTEGRATIVE PHYSIOLOGY
(2019)
Article
Environmental Sciences
Maria Christou, Arturas Kavaliauskis, Erik Ropstad, Thomas William Kenneth Fraser
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Fisheries
Thomas W. K. Fraser, Tom J. Hansen, Florian Sambraus, Per Gunnar Fjelldal
Summary: This study evaluated vertebral deformities in salmonid interspecific hybrids over three separate year classes during the freshwater life stage. Some of the salmonids were triploidised. The research found that pressure-shocked triploids had higher rates of vertebral deformities compared to diploids, regardless of hybridisation, and observed spontaneous triploidy in certain groups in the third-year class.
JOURNAL OF FISH BIOLOGY
(2021)
Article
Biology
Erling Nilsen Riseth, Thomas W. K. Fraser, Florian Sambraus, Lars Helge Stien, Malthe Hvas
JOURNAL OF THERMAL BIOLOGY
(2020)
Article
Genetics & Heredity
Tom Johnny Hansen, David Penman, Kevin Alan Glover, Thomas William Kenneth Fraser, Tone Vagseth, Anders Thorsen, Anne Grete Eide Sorvik, Per Gunnar Fjelldal
Article
Environmental Sciences
Maria Christou, Thomas W. K. Fraser, Vidar Berg, Erik Ropstad, Jorke H. Kamstra
ENVIRONMENTAL RESEARCH
(2020)
Article
Fisheries
Thomas W. K. Fraser, Hilde Leroy, Tom J. Hansen, Jon Egil Skjaeraasen, Valentina Tronci, Cindy P. Pedrosa, Per Gunnar Fjelldal, Tom Ole Nilsen
Summary: The study indicates that triploid Atlantic salmon and hybrid strains show enhanced growth performance compared to diploid salmon in an aquaculture setting, making them more suitable for commercial breeding.
Article
Marine & Freshwater Biology
Maria Christou, Erik Ropstad, Stephen Brown, Jorke H. Kamstra, Thomas W. K. Fraser
Summary: The study investigated the long-term effects of a human relevant mixture of 29 POPs on adult zebrafish and found that these compounds reduced swimming performance and increased length and weight. However, no effects of developmental exposure were observed on reproductive output or anxiety behavior.
AQUATIC TOXICOLOGY
(2021)
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
Thomas W. K. Fraser, Tom J. Hansen, Sofie C. Rem, Per Gunnar Fjelldal
Summary: The study found that triploid Arctic char were heavier at tagging but lighter at harvest compared to diploids. Growth differences in triploids were mainly related to sex and life history, with males growing faster than females. While triploids did not show a significant growth disadvantage, they had lower survival rates and a higher incidence of fish with deformed vertebrae.