Frode Oppedal
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View article: Evidence for the Evolution of Resistance to Non‐Chemical Parasite Controls: Salmon Lice From Submerged Cages Produce Larvae That Swim Deeper
Evidence for the Evolution of Resistance to Non‐Chemical Parasite Controls: Salmon Lice From Submerged Cages Produce Larvae That Swim Deeper Open
Salmon lice ( Lepeophtheirus salmonis ) pose a major challenge to the sustainability of salmon aquaculture due to their capacity to rapidly evolve resistance to parasite control methods. As the effectiveness of chemical treatments has decl…
View article: Behaviour and Dispersal of Mobile Salmon Lice When Detached From the Host
Behaviour and Dispersal of Mobile Salmon Lice When Detached From the Host Open
Sea lice can flourish when salmon are farmed in open sea‐cages, necessitating treatments to control outbreaks and reduce larval export. However, mobile ectoparasitic stages can be dislodged during crowding or other procedures, and potentia…
View article: Post-smolt Atlantic salmon can regulate buoyancy in submerged sea-cages by gulping air bubbles
Post-smolt Atlantic salmon can regulate buoyancy in submerged sea-cages by gulping air bubbles Open
Salmon lice (Lepeophtheirus salmonis) are the most severe health challenge facing Atlantic salmon (Salmo salar) aquaculture. Infestations threaten farmed and wild salmonids, drive up production costs, and limit industry growth. Submersible…
View article: A passive fish sampling method is representative for size but selective for parasite load
A passive fish sampling method is representative for size but selective for parasite load Open
Fish capture in industrial aquaculture is both necessary (i.e., for transfer, monitoring and harvesting) and difficult. The most logistically feasible methods rely heavily on crowding, a process that is detrimental to fish welfare and prod…
View article: The Behavioral and Neurobiological Response to Sound Stress in Salmon
The Behavioral and Neurobiological Response to Sound Stress in Salmon Open
Introduction: Noise associated with human activities in aquatic environments can affect the physiology and behavior of aquatic species which may have consequences at the population and ecosystem levels. Low-frequency sound is particularly …
View article: Efficiency of salmon production in submerged cages with air domes matches standard surface cages when environments are similar
Efficiency of salmon production in submerged cages with air domes matches standard surface cages when environments are similar Open
Submerged cage technology may enable placement of salmon farms at more exposed sites whilst avoiding the impacts of damaging weather on farm structures. Field trials have demonstrated that Atlantic salmon grow well in submerged cages for a…
View article: Fasting and its implications for fish welfare in Atlantic salmon aquaculture
Fasting and its implications for fish welfare in Atlantic salmon aquaculture Open
Periods of fasting occur for a multitude of reasons in Atlantic salmon aquaculture. Feed withdrawal is widely used prior to transport, parasite treatments, preslaughter and for depuration purposes in recirculating aquaculture systems. Volu…
View article: Tolerance to fluctuating currents in farmed Atlantic salmon: a novel method to simulate offshore wave effects in the laboratory
Tolerance to fluctuating currents in farmed Atlantic salmon: a novel method to simulate offshore wave effects in the laboratory Open
To ensure acceptable animal welfare in emerging offshore Atlantic salmon aquaculture, it is crucial to understand the biological limits of the fish. Much work has been done on the effects of water currents, but few studies exist on waves, …
View article: Atlantic salmon in chronic turbulence: Effects on growth, behaviour, welfare, and stress
Atlantic salmon in chronic turbulence: Effects on growth, behaviour, welfare, and stress Open
An increasing number of aquaculture companies aim to relocate Atlantic salmon (Salmo salar) farms to offshore locations exposed to large wave action. However, the impact that this environment will have on the fish reared within remains unk…
View article: Comparison of non-medicinal delousing strategies for parasite (Lepeophtheirus salmonis) removal efficacy and welfare impact on Atlantic salmon (Salmo salar) hosts
Comparison of non-medicinal delousing strategies for parasite (Lepeophtheirus salmonis) removal efficacy and welfare impact on Atlantic salmon (Salmo salar) hosts Open
Since salmon lice have developed resistance to pesticides, non-medicinal delousing treatments have become increasingly used to remove the parasite from fish on salmon farms in Norwegian waters. These novel techniques are an important means…
View article: Novel tag-based method for measuring tailbeat frequency and variations in amplitude in fish
Novel tag-based method for measuring tailbeat frequency and variations in amplitude in fish Open
The tailbeat frequency (TBF) together with tailbeat amplitude (TBA) of fish are tightly correlated with swimming speed. In addition, these parameters can be used as indicators of metabolic rate and general activity level, provided that app…
View article: Environmentally responsive parasite prevention halves salmon louse burden in commercial marine cages
Environmentally responsive parasite prevention halves salmon louse burden in commercial marine cages Open
Though a naturally occurring species throughout the Atlantic, parasitic salmon louse (Lepeophtheirus salmonis) population dynamics are increasingly intertwined with salmonid aquaculture. In contrast to reactive louse management, tools and …
View article: Declining size-at-harvest in Norwegian salmon aquaculture: Lice, disease, and the role of stunboats
Declining size-at-harvest in Norwegian salmon aquaculture: Lice, disease, and the role of stunboats Open
Sea cages used for fish farming are typically open to the environment, making the grow-out phase a race against the accumulation of infections. In Norway, farmed Atlantic salmon (Salmo salar) suffer outbreaks of salmon lice (Lepeophtheirus…
View article: Sentinels in Salmon Aquaculture: Heart Rates Across Seasons and During Crowding Events
Sentinels in Salmon Aquaculture: Heart Rates Across Seasons and During Crowding Events Open
Advances in tag technology now make it possible to monitor the behavior of small groups of individual fish as bioindicators of population wellbeing in commercial aquaculture settings. For example, tags may detect unusual patterns in fish h…
View article: Full production cycle, commercial scale culture of salmon in submerged sea-cages with air domes reduces lice infestation, but creates production and welfare challenges
Full production cycle, commercial scale culture of salmon in submerged sea-cages with air domes reduces lice infestation, but creates production and welfare challenges Open
Structural modification of sea cages is continually changing to counter major production issues associated with commercial salmon farming. For example, snorkels and skirts are added to cages to reduce salmon lice infestations, and submergi…