Rolf Erik Olsen
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Catecholamines as central modulators of the stress response. A preliminary study in Atlantic salmon (Salmo salar) head kidney cells Open
This study investigated the contribution of catecholamines to stress regulation in Atlantic salmon, with the goal of clarifying inconsistencies between the classical model of cortisol control in teleosts and recent observations that challe…
Influence of dietary phospholipid level and bile salt supplementation on larval performance of Atlantic cod (Gadus morhua L.) Open
Lipid nutrition in Atlantic cod ( Gadus morhua ) larvae remains poorly understood, which poses challenges for optimizing commercial diets for cod larviculture. This study investigated the effects of two dietary phospholipid (PL) levels (~ …
Functional feed ingredients modulate the immune response of RTgutGC cells to LPS-induced inflammation Open
Functional feed ingredients can enhance the fish gut integrity and immune resilience during challenging situations in the aquaculture industry. This study used the RTgutGC cell line – derived from rainbow trout intestinal epithelium, to ev…
View article: Synthesis and properties of pentabutyryl glucose ester and its effects on the growth, liver and intestinal health, and gut microbiota of zebrafish (Danio rerio)
Synthesis and properties of pentabutyryl glucose ester and its effects on the growth, liver and intestinal health, and gut microbiota of zebrafish (Danio rerio) Open
Butyric acid and its derivatives are widely applied in aquaculture as an alternative to antibiotics, which are beneficial for the growth and health of aquatic animals. However, these products have some disadvantages including poor stabilit…
A fishy gut feeling – current knowledge on gut microbiota in teleosts Open
The importance of the gastrointestinal microbiota (GM) in health and disease is widely recognized. Although less is known in fish than in mammals, advances in molecular techniques, such as 16S rRNA sequencing, have facilitated characteriza…
Can Copepods Feed on Kelp Detritus? A Laboratory Study With <i>Calanus finmarchicus</i> Open
Kelp forests are dynamic coastal habitats that generate large amounts of carbon‐rich detritus. The fate of this detritus is largely unknown and considered a missing link in global carbon budgets. Kelp detritus can serve as food for benthic…
Dietary Solid-state-fermentation product of Bacillus velezensis T23 alleviate hepatic steatosis, oxidative stress, gut barrier damage, and microbiota dysbiosis in juvenile genetically improved farmed tilapia (GIFT, Oreochromis niloticus) Open
The application of commensal probiotic bacteria is one of the preferable green feed additives for antibiotic substitution in aquaculture, while the application methods and detailed action mechanisms of commensal bacteria isolated from aqua…
Transgenic omega-3 and carotenoid-enriched camelina oil on fillet quality of rainbow trout Oncorhynchus mykiss Open
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A Proof-of-Concept Study to Develop a Peptide-Based Vaccine against Salmon Lice Infestation in Atlantic Salmon (Salmo salar L.) Open
Proteins present in blood samples from Atlantic salmon (Salmo salar) infected with salmon lice (Lepeophtheirus salmonis) were analyzed using liquid chromatography–high-resolution mass spectrometry. Bioinformatic analyses revealed 1820 prot…
Replacing fishmeal with salmon hydrolysate reduces the expression of intestinal inflammatory markers and modulates the gut microbiota in Atlantic salmon (Salmo salar) Open
The feed legislation allows the use of fish protein hydrolysates in feed for the same species in which it came from, since enzymatic hydrolysis degrades the proteins and eliminates potential prions, which have caused disease in mammals, bu…
View article: Comparing physiological responses of acute and chronically stressed diploid and triploid Atlantic salmon (Salmo salar)
Comparing physiological responses of acute and chronically stressed diploid and triploid Atlantic salmon (Salmo salar) Open
We compared the performance and physiological response of diploid and triploid Atlantic salmon (Salmo salar) following 21 days of either unpredictable chronic stress (UCS) or no disturbance (control). Thereafter, all four groups were chall…
Assessment of activity and heart rate as indicators for acute stress in Atlantic salmon Open
The aim of this study was to assess whether activity and heart rate sensor implants can be used to measure stress and thus estimate one important welfare indicator for fish in aquaculture pens, and if such measurements correlate to physiol…
View article: Effect of Dietary Cholesterol, Phytosterol, and Docosahexaenoic Acid on Astaxanthin Absorption and Retention in Rainbow Trout
Effect of Dietary Cholesterol, Phytosterol, and Docosahexaenoic Acid on Astaxanthin Absorption and Retention in Rainbow Trout Open
Astaxanthin (Ax) determines the flesh redness of a salmonid fish which is the most desirable quality indicator by consumers. Fish cannot synthesize Ax de novo, therefore, the only way to increase flesh redness is to increase dietary input …
Environmentally driven changes in Atlantic salmon oxidative status interact with physiological performance Open
Farmed Atlantic salmon in sea cages experience natural seasonal changes in seawater temperature and photoperiod. Atlantic salmon have more oxidized tissues in spring and early summer, and this corresponds to the period of increasing day le…
Under the sea: How can we use heart rate and accelerometers to remotely assess fish welfare in salmon aquaculture? Open
Recent advances in bio-sensing technologies open for new possibilities to monitor and safeguard the welfare of fishes in aquaculture. Yet before taken into practice, the applicability of all novel biosensors must be validated, and the brea…
Seasonal Changes in Photoperiod: Effects on Growth and Redox Signaling Patterns in Atlantic Salmon Postsmolts Open
Farmed Atlantic salmon reared under natural seasonal changes in sea-cages had an elevated consumption of antioxidants during spring. It is, however, unclear if this response was caused by the increase in day length, temperature, or both. T…
ECG augmented pulse oximetry in Atlantic salmon (Salmo salar)—A pilot study Open
Understanding the tolerance limits of fish is crucial for developing aquaculture operations that ensure good animal welfare. However, there exist little data describing the physiological responses in farmed Atlantic salmon, much because th…
Salmon hydrolysate as a protein source for Atlantic salmon; prion content and effects on growth, digestibility and gut health Open
Feeding unhydrolyzed protein to the same species from which it came from have caused prion disease in some mammals, but this has not been observed in fish. In this study, we characterized a salmon protein hydrolysate (FPH) for prion conten…
View article: Fucoidan from Undaria pinnatifida mitigates intestinal inflammation in Atlantic salmon (Salmo salar)
Fucoidan from Undaria pinnatifida mitigates intestinal inflammation in Atlantic salmon (Salmo salar) Open
Using functional feed ingredients to increase the intestinal health of Atlantic salmon (Salmo salar) could allow greater variation and higher inclusion of plant-based proteins in the feed. This is beneficial both for the fish feed industry…
Nephrocalcinosis in juvenile farmed Atlantic Salmon (<i>Salmo salar</i>) may be linked to osmoregulatory stress Open
Nephrocalcinosis is a widespread challenge in intensive production of salmon smolt. There is however no consensus on its aetiology, which makes it problematic to implement proper measures to limit its development. We performed a survey of …
Data for characterization of the optical properties of Atlantic salmon (<i>Salmo salar</i>) blood Open
Photoplethysmography is a recent addition to physio‐logging in Atlantic salmon which can be used for pulse oximetry provided that the properties for light propagation in salmon tissues are known. In this work, optical properties of three c…
View article: Effect of dietary cholesterol, phytosterol, and docosahexaenoic acid on astaxanthin absorption and retention in rainbow trout
Effect of dietary cholesterol, phytosterol, and docosahexaenoic acid on astaxanthin absorption and retention in rainbow trout Open
Astaxanthin (Ax) determines the flesh redness of a salmonid fish which is the most desirable quality indicator by consumers. Fish cannot synthesize Ax de novo , therefore the only way to increase flesh redness is to increase dietary input …
Dietary ARA, DHA, and Carbohydrate Ratios Affect the Immune Status of Gilthead Sea Bream Juveniles upon Bacterial Challenge Open
This study aims to assess the effects of different dietary n-6/n-3 long-chain polyunsaturated fatty acid ratios and CHO content in the immune response of gilthead seabream. For that purpose, gilthead sea bream juveniles (initial body weigh…
Algal oil gives control of long‐chain omega‐3 levels in full‐cycle production of Atlantic salmon, without detriment to zootechnical performance and sensory characteristics Open
The levels of eicosapentaenoic (EPA) and docosahexaenoic (DHA) in salmon fillets have decreased because of the progressive replacement of fish oil (FO). This study contributes to enabling the sustainable growth of aquaculture by confirming…
The Fish Microbiota: Research Progress and Potential Applications Open
The gut microbiota plays an important role in host health and disease. Our understanding of the fish microbiota lags far behind our knowledge of that of humans and other mammals. Nevertheless, research has highlighted the importance of the…
Effects of nuclease-treated fermentation product of Lactobacillus rhamnosus GCC-3 on growth, hepatic health and gut microbiota of zebrafish (Danio rerio) fed a high-fat diet Open
Probiotics are reported to improve the nutrition, immunity, and health of fish. Nuclease can hydrolyze nucleic acids of probiotics to produce nucleotides. The present study investigated the effect of stabilized fermentation product of nucl…