Article
Fisheries
Turid Synnove Aas, Trine Ytrestoyl, Hanne Jorun Sixten, Marie Hillestad, Harald Sveier, Torbjorn Asgard
Summary: Physical feed properties have an impact on feed utilization in fish, with Diet 1 showing higher apparent digestibility of lipid compared to Diet 2. Passage rate through the gastrointestinal system was faster for Diet 1, with no significant difference in feed intake observed between the two diets.
AQUACULTURE NUTRITION
(2021)
Article
Environmental Sciences
Ana S. Gomes, Fabian Zimmermann, Ernst M. Hevroy, Marcus A. L. Soyland, Tom J. Hansen, Tom Ole Nilsen, Ivar Ronnestad
Summary: Precision feeding aims to provide optimal growth and performance for farmed animals while minimizing feed waste. This study examined the relationship between meals, feed deprivation time, and the feed consumed by Atlantic salmon post smolts. The results showed that the time between meals and the size of the previous meal significantly affected the feed intake in the following meal, suggesting the possibility of optimizing meal size.
FRONTIERS IN MARINE SCIENCE
(2023)
Article
Agriculture, Dairy & Animal Science
Hongbo Zeng, Yuyang Yin, Lingxi Chen, Zhuoxin Xu, Yang Luo, Qian Wang, Bin Yang, Jiakun Wang
Summary: Improving feed efficiency is crucial to the animal industry. Residual feed intake (RFI) is regarded as an index of feed efficiency evaluation. This study aimed to explore the alterations in growth performance and nutrient digestion in Hu sheep with different RFI phenotypes. The results showed that despite lower dry matter intake, low RFI sheep had higher nutrient digestibility, N retention, ruminal propionate production, and serum glucose utilization, in order to meet energy demands. Selection for low RFI sheep could reduce feed costs and provide economic benefits to the sheep industry.
Article
Fisheries
Turid Synnove Aas, Torbjorn Asgard, Trine Ytrestoyl
Summary: The paper provides an update on the utilization of feed resources in Norwegian salmon farming in 2020, including the feed ingredients used and the retention of nutrients. The study found that the feed ingredients and utilization in 2020 were similar to those in 2016, with an increase in feed production and a slight increase in the economic feed conversion ratio (eFCR).
AQUACULTURE REPORTS
(2022)
Article
Fisheries
B. Hart, R. Schurr, N. Narendranath, A. Kuehnle, S. M. Colombo
Summary: The study demonstrates that whole cell Schizochytrium sp. (Sc) offers a highly digestible (98%) source of PUFAs and protein, without the need for oil extraction or cell disruption.
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
Biochemistry & Molecular Biology
David Munoz, Ricardo Fuentes, Beatriz Carnicero, Andrea Aguilar, Nataly Sanhueza, Sergio San-Martin, Cristian Agurto, Andrea Donoso, Leonardo E. Valdivia, Jesus M. Miguez, Lluis Tort, Sebastian Boltana
Summary: Feeding behavior in fish is influenced by multiple signals in the brain, with stress cues such as viral infection triggering responses from hypothalamic neurons to regulate energy storage and expenditure. This study provides evidence of a molecular linkage between inflammation and food intake in Salmon salar, highlighting the importance of understanding the interplay between energy homeostasis and pathogenesis in fish.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2021)
Article
Fisheries
Andre S. Bogevik, Tor Andreas Samuelsen, Tone Aspevik, Odd Helge Romarheim, Turid Synnove Aas, Tharmini Kalananthan, Ivar Ronnestad
Summary: This study produced two salmon feeds with different disintegration stabilities by changing the lipid levels in the feed mix, followed by feeding trials with Atlantic salmon and an in vitro gastric study. The results showed that feeds with higher lipid content had higher disintegration stability, affecting feed intake.
Article
Fisheries
Cui Liu, Anjana M. Palihawadana, Nimalan Nadanasabesan, Ghana K. Vasanth, Ioannis N. Vatsos, Jorge Dias, Luisa M. P. Valente, Giulia Micallef, Mette Sorensen, Viswanath Kiron
Summary: This study explores the efficacy of using microalgae as a feed ingredient for fish and validates the results through both a laboratory study and a farm trial. The findings suggest that microalgae can slightly increase the deposition of n-3 fatty acids, EPA, and DHA in Atlantic salmon. Additionally, the pre-treatment of microalgae using extrusion shows positive effects on fish growth, digestibility, and feed utilization efficiency.
Article
Fisheries
Sean M. Tibbetts, Shane J. J. Patelakis
Summary: The study showed that Pav459 meal from marine microalgae has good potential in low trophic aquafeeds, with high nutritional value including protein and essential fatty acids. The inclusion of 20% Pav459 meal in the diet of Atlantic salmon significantly improved nutrient utilization and may help meet n3 LC PUFA requirements.
Article
Fisheries
F. Lai, S. Comesana, A. S. Gomes, D. Flatejord, I. Tolas, M. Espe, C. De Santis, M. B. Hartviksen, T. Verri, J. L. Soengas, I. Ronnestad
Summary: This study found that high leucine diets reduce feed intake, growth, and hepatosomatic index in Atlantic salmon. It was also found that high leucine diets activate amino acid sensing mechanisms in the brain, which further affects the expression of genes related to appetite control.
Article
Fisheries
Enrique Pino Martinez, Pablo Balseiro, Sigurd O. Stefansson, Nobuto Kaneko, Birgitta Norberg, Mitchell S. Fleming, Albert K. D. Imsland, Sigurd O. Handeland
Summary: Early maturation of Atlantic salmon male postsmolts has negative effects on growth and adaptation in aquaculture. This study found that temperature and feeding ration significantly influenced sexual maturation in salmon, with higher temperatures and feeding rations leading to more early maturation.
Article
Biotechnology & Applied Microbiology
Joceline Ruiz, Genevieve Corraze, Lorenzo Marquez, Paola Orellana, Adrian J. Hernandez, Patricio Dantagnan
Summary: This study evaluated the apparent digestibility coefficient of macronutrients provided by whole and disrupted cells of Aurantiochytrium acetophilum in diets for Atlantic salmon. The results showed that cell treatment, inclusion percentage, and their interaction significantly affected the digestibility of dry matter, lipids, and energy.
ALGAL RESEARCH-BIOMASS BIOFUELS AND BIOPRODUCTS
(2022)
Article
Fisheries
Tor Andreas Samuelsen, Marie Hillestad, Hans Jakup Jacobsen, Tor Johannes Hjertnes, Hanne Jorun Sixten
Summary: The study aimed to investigate the impact of starch content and pellet physical quality on the biological response in Atlantic salmon. Results showed that physical properties such as starch content, hardness, and durability significantly influenced the growth performance of the fish, potentially affecting feed hydration and dissolution rates.
AQUACULTURE REPORTS
(2021)
Article
Fisheries
Jon Ovrum Hansen, Leidy Lagos, Peng Lei, Felipe Eduardo Reveco-Urzua, Byron Morales-Lange, Line Degn Hansen, Marion Schiavone, Liv Torunn Mydland, Magnus Overlie Arntzen, Luis Mercado, Ricardo Tavares Benicio, Margareth Overland
Summary: Different downstream processing of S. cerevisiae resulted in increased protein and beta-glucan solubility that further enhanced protein digestibility in Atlantic salmon. Furthermore, different processing methods induced different immune stimulatory effects in Atlantic salmon.
Article
Fisheries
Albert Kjartan Dagbjartarson Imsland, Patrick Reynolds, Thor Arne Hangstad, Lauri Kapari, Simo Njabulo Maduna, Snorre B. Hagen, Olof Dora Bartels Jonsdottir, Frank Spetland, Ken Stale Lindberg
Summary: This study found significant differences in sea lice grazing efficacy, growth, and cataract prevalence among different families of lumpfish. Smaller lumpfish demonstrated higher potential for sea lice grazing, with family and paternal effects influencing this behavior. The results suggest that selective breeding programs targeting specific families could enhance sea lice grazing of L. salmonis and C. elongatus.
Article
Fisheries
Mingxu Xie, Yadong Xie, Yu Li, Wei Zhou, Zhen Zhang, Yalin Yang, Rolf Erik Olsen, Chao Ran, Zhigang Zhou
Summary: The study suggests that low-level uPP addition can enhance fish meal replacement, while 5% uPP in the diet has negative effects on gut and liver health of common carp and disrupts intestinal microbiota.
AQUACULTURE REPORTS
(2021)
Article
Fisheries
Marit Bjornevik, Albert K. D. Imsland, Henriette Hanssen, Bjorn Roth, Erik Vikingstad, Atle Foss
Summary: This study found that alternate day feeding of Atlantic cod can significantly increase weight gain and improve feed conversion ratio, while reducing feed consumption. Feeding on alternate days can greatly reduce feeding costs without compromising biomass growth.
AQUACULTURE NUTRITION
(2021)
Review
Fisheries
Michael Sievers, Oyvind Korsoen, Fletcher Warren-Myers, Frode Oppedal, Georgia Macaulay, Ole Folkedal, Tim Dempster
Summary: Submerged cages are becoming a new trend in marine aquaculture due to their ability to reduce issues associated with surface-based cages. Fish with closed swim bladders and without swim bladders are more suitable for submerged culture, while fish with open swim bladders may face more challenges in this process.
REVIEWS IN AQUACULTURE
(2022)
Article
Fisheries
Mette Remen, Armand Moe Nes, Thor Arne Hangstad, Perrine Geraudie, Patrick Reynolds, Tonje Cecilie Urskog, Anna Hanssen, Sigurd Olav Stefansson, Albert Kjartan Dagbjartarson Imsland
Summary: This study aimed to determine the environmental hypoxia zone for lumpfish of different sizes and temperatures, and investigate their stress response to acute changes in dissolved oxygen levels. The results showed that metabolism, performance, and aerobic metabolic scope of lumpfish were influenced by temperature and fish size.
Article
Fisheries
Mingxu Xie, Yadong Xie, Yu Li, Wei Zhou, Zhen Zhang, Yalin Yang, Rolf Erik Olsen, Einar Ringo, Chao Ran, Zhigang Zhou
Summary: Probiotics are widely used in aquafeeds to improve fish health and resistance to pathogens. This study examined the effects of a stabilized fermentation product of Cetobacterium somerae on zebrafish gut, liver health, and antiviral immunity. Results showed that the dietary supplement improved liver and gut health while enhancing antiviral immunity in zebrafish.
FISH & SHELLFISH IMMUNOLOGY
(2022)
Article
Nutrition & Dietetics
Qianwen Ding, Qiang Hao, Qingshuang Zhang, Yalin Yang, Rolf Erik Olsen, Einar Ringo, Chao Ran, Zhen Zhang, Zhigang Zhou
Summary: This study investigated the effects of docosahexaenoic acid (DHA) on fatty liver in zebrafish. The results showed that supplementation of DHA reduced hepatic lipid synthesis and promoted lipid beta-oxidation through Cyclin D1 inhibition. Furthermore, DHA facilitated lipid beta-oxidation through gut microbiota. These findings reveal the lipid-lowering effects of DHA and emphasize the importance of fatty acid composition in formulating high-fat diets for fish.
FRONTIERS IN NUTRITION
(2022)
Article
Fisheries
C. Klykken, A. K. Reed, A. S. Dalum, R. E. Olsen, M. K. Moe, K. J. K. Attramadal, L. Boissonnot
Summary: There is a growing concern for fish health and welfare in the salmon industry in Norway. The study found that nephrocalcinosis, characterized by mineral deposits in the kidneys, is common and varies in severity among Atlantic salmon. Most fish had mild forms of nephrocalcinosis with minimal tissue damage, while severely affected fish showed almost complete loss of kidney structure. Mineral deposits mainly consisted of amorphous carbonate apatite, and fish with nephrocalcinosis also exhibited imbalances in plasma chemistry, indicating disturbed osmoregulation and increased stress levels.
Article
Fisheries
Thomas W. K. Fraser, Tom J. Hansen, Sofie C. Remo, Rolf Erik Olsen, Per Gunnar Fjelldal
Summary: Interspecific hybridisation can improve the performance of sterile triploid salmonids, but it also leads to welfare issues, with only fillet coloration being improved.
Article
Fisheries
R. Magalhaes, N. Martins, F. Fontinha, A. Couto, C. R. Serra, R. A. Santos, E. Olsen, H. Peres, A. Oliva-Teles
Summary: The present study investigates the effects of different diet compositions on the oxidative status, histomorphology of liver and intestine, and intestinal microbiota modulation in gilthead sea bream juveniles. The results show that ARA-rich diets reduce liver and intestine lipid peroxidation, while DHA-rich diets increase the activity of antioxidant enzymes in the liver. Additionally, dietary starch improves the oxidative stress index in the liver and has positive effects on glutathione and lipid peroxidation in the intestine. Fish fed high starch diets also experience hepatocyte hypertrophy and alterations in nuclei position. Compared to DHA diets, ARA diets result in reduced diversity of intestinal microbiota. In conclusion, high dietary ARA provides protection to the liver and intestine of gilthead sea bream juveniles, and the balanced ratio of ARA/DHA in the diet has important effects on antioxidant status and intestinal microbiota diversity.
Article
Fisheries
Mingxu Xie, Qiang Hao, Rolf Erik Olsen, Einar Ringo, Yalin Yang, Zhen Zhang, Chao Ran, Zhigang Zhou
Summary: This study evaluated the effects of a stabilized fermentation product of Cetobacterium somerae (XMX-1) on the growth performance, gut, and liver health of common carp. The results showed that the addition of XMX-1 reduced serum lipopolysaccharide and diamine oxidase activity, increased intestinal total superoxide dismutase activity, and regulated the expression of certain genes. Furthermore, XMX-1 supplementation decreased serum alanine aminotransferase and liver triacylglycerol levels, and influenced the expression of genes related to liver lipid metabolism. L-XMX-1 at a level of 3 g/kg had the best effect on fish health.
AQUACULTURE REPORTS
(2022)
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
Biochemistry & Molecular Biology
Peng Yin, Bjorn Thrandur Bjornsson, Per Gunnar Fjelldal, Takaya Saito, Sofie Charlotte Remo, Rolf Brudvik Edvardsen, Tom Hansen, Sandeep Sharma, Rolf Erik Olsen, Kristin Hamre
Summary: Accumulating evidence suggests a close relationship between oxidative stress and growth rate in fish, but the underlying mechanisms are not clear. This study investigated the combined effect of dietary antioxidants and growth hormone (GH) on the redox status of liver and muscle in Atlantic salmon. The results show that GH implantation decreases vitamin C and E levels, increases oxidative stress in the liver, and affects the expression of genes and pathways related to antioxidant enzymes and redox balance. Dietary antioxidants do lower oxidative stress but have no effect on the growth rate.
Article
Fisheries
Cameron R. S. Thompson, Angelico Madaro, Jonatan Nilsson, Lars Helge Stien, Frode Oppedal, Oyvind Overli, Wayne J. Korzan, Samantha Bui
Summary: Due to pesticide resistance, non-medicinal delousing treatments are increasingly used in Norwegian salmon farms. These treatments are important for controlling lice epidemics and preventing their spread to wild salmon populations. However, some treatments have negative welfare impacts on the host fish. In a controlled lab experiment, freshwater bath and combination treatments were found to be the most effective for delousing.
AQUACULTURE INTERNATIONAL
(2023)
Article
Fisheries
Albert K. D. Imsland, Aoalheiour Olafsdottir, Jon Arnason, Arnpor Gustavsson, Helgi Thorarensen, Snorri Gunnarsson
Summary: This study explored the impact of different and progressively changing rearing temperatures on the sensory quality of Arctic charr fillets, showing that lower rearing temperatures lead to increased freshness characteristics and color intensity, as well as improved softness and juiciness in the fillets. The final rearing temperature appeared to have a greater influence on sensory attributes than the initial temperature.
AQUACULTURE RESEARCH
(2021)