Search results for: Frode Oppedal

Items from 1 to 20 out of 57 results

article

Fasting and its implications for fish welfare in Atlantic salmon aquaculture

Malthe Hvas, Jelena Kolarevic, Chris Noble, Frode Oppedal, more

Reviews in Aquaculture > 16 > 3 > 1308 - 1332

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. Voluntary fasting is a coping response when fish have poor health or are exposed to poor farm environments. Owing to increased attention to animal welfare in aquaculture,...

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Submerged cage aquaculture of marine fish: A review of the biological challenges and opportunities

Michael Sievers, Øyvind Korsøen, Fletcher Warren‐Myers, Frode Oppedal, more

Reviews in Aquaculture > 14 > 1 > 106 - 119

Surface‐based cages are the dominant production technology for the marine finfish aquaculture industry. However, issues such as extreme weather events, poor environmental conditions, interactions with parasites, and conflicts with other coastal users are problematic for surface‐based aquaculture. Submerged cages may reduce many of these problems and commercial interest in their use has increased....

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Finding the needle in the haystack: Comparison of methods for salmon louse enumeration in plankton samples

Samantha Bui, Sussie Dalvin, Tone Vågseth, Frode Oppedal, more

Aquaculture Research > 52 > 8 > 3591 - 3604

The economic and social implications of salmon louse (Lepeophtheirus salmonis) epidemics in salmon aquaculture drive focus of the dispersal dynamics of the planktonic larval stages. The vast spatial scale and high connectivity of the marine environment creates difficult conditions to monitor the infective planktonic louse stage, whereby the number of samples required for a representative description...

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Evolution of salmon lice in response to management strategies: a review

Andrew Coates, Ben L. Phillips, Samantha Bui, Frode Oppedal, more

Reviews in Aquaculture > 13 > 3 > 1397 - 1422

Ectoparasitic salmon lice (Lepeophtheirus salmonis) present a major challenge to Atlantic salmon (Salmo salar) aquaculture. The demand for effective louse control has produced diverse management strategies. These strategies essentially impose novel selection pressures on parasite populations, driving the evolution of resistance. Here we assess the potential for salmon lice to adapt to current prevention...

article

Tag use to monitor fish behaviour in aquaculture: a review of benefits, problems and solutions

Georgia Macaulay, Fletcher Warren‐Myers, Luke T. Barrett, Frode Oppedal, more

Reviews in Aquaculture > 13 > 3 > 1565 - 1582

A variety of tagging techniques are now available to monitor fish behaviour, physiology and their environmental experience. Tagging is frequently used in aquaculture research to monitor free‐swimming individuals within farmed populations. However, for information gathered from tagged fish to be representative of farmed populations, tagging must not fundamentally affect fish behaviour, physiology or...

article

Skeletal deformities in wild and farmed cleaner fish species used in Atlantic salmon Salmo salar aquaculture

Per Gunnar Fjelldal, Angelico Madaro, Malthe Hvas, Lars Helge Stien, more

Journal of Fish Biology > 98 > 4 > 1049 - 1058

As a first attempt to assess bone health in cleaner fish production, wild and cultured ballan wrasse Labrus bergylta and lumpfish Cyclopterus lumpus were examined by radiology. In C. lumpus, wild fish (57%) had more vertebra deformities (≥1 deformed vertebrae) than cultured fish (2–16%). One wild C. lumpus had lordosis and another was missing the tail fin. In L. bergylta, wild fish (11%) had fewer...

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Challenges and benefits of applying fish behaviour to improve production and welfare in industrial aquaculture

Georgia Macaulay, Samantha Bui, Frode Oppedal, Tim Dempster

Reviews in Aquaculture > 13 > 2 > 934 - 948

An understanding of behaviour is used in zoos, laboratories and agriculture to reduce stressful aspects of the captive environment for animals. While fish are one of the most cultivated of all vertebrate groups, incorporating their behaviour into production management has proved elusive. Here, we evaluate the current evidence base relating to use of (i) innate behaviours of fish and (ii) their ability...

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Fish welfare in offshore salmon aquaculture

Malthe Hvas, Ole Folkedal, Frode Oppedal

Reviews in Aquaculture > 13 > 2 > 836 - 852

To accommodate further growth in the Atlantic salmon aquaculture industry, new production sites may well be established at more exposed locations along the coast or even offshore. Here, fish will encounter strong currents and powerful waves, which are avoided at traditional sheltered locations. Exposed locations offer several advantages and necessitate new technological advancements. However, the...

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Heart rates of Atlantic salmon Salmo salar during a critical swim speed test and subsequent recovery

Malthe Hvas, Ole Folkedal, Frode Oppedal

Journal of Fish Biology > 98 > 1 > 102 - 111

In this study, heart rate (HR) bio‐loggers were implanted in the abdominal cavity of 12 post‐smolt Atlantic salmon Salmo salar weighing 1024 ± 31 g and acclimated to 12°C sea water. One week after the surgical procedure, a critical swim speed (U_crit) test was performed on tagged and untagged conspecifics, whereafter tagged fish were maintained in their holding tanks for another week. The U_crit was...

article

Prevention not cure: a review of methods to avoid sea lice infestations in salmon aquaculture

Luke T. Barrett, Frode Oppedal, Nick Robinson, Tim Dempster

Reviews in Aquaculture > 12 > 4 > 2527 - 2543

The Atlantic salmon aquaculture industry still struggles with ectoparasitic sea lice despite decades of research and development invested into louse removal methods. In contrast, methods to prevent infestations before they occur have received relatively little research effort, yet may offer key benefits over treatment‐focused methods. Here, we summarise the range of potential and existing preventative...

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The effect of temperature on ability of Lepeophtheirus salmonis to infect and persist on Atlantic salmon

Sussie Dalvin, Lars Are Hamre, Rasmus Skern‐Mauritzen, Tone Vågseth, more

Journal of Fish Diseases > 43 > 12 > 1519 - 1529

The salmon louse (Lepeophtheirus salmonis) is an ecologically and economically important parasite of salmonid fish. Temperature is a strong influencer of biological processes in salmon lice, with development rate increased at higher temperatures. The successful attachment of lice onto a host is also predicted to be influenced by temperature; however, the correlation of temperature with parasite survival...

article

Where art thou louse? A snapshot of attachment location preferences in salmon lice on Atlantic salmon hosts in sea cages

Samantha Bui, Frode Oppedal, Velimir Nola, Luke T. Barrett

Journal of Fish Diseases > 43 > 6 > 697 - 706

Problematic sea lice infestations on farmed Atlantic salmon (Salmo salar) have motivated extensive research and development into new methods to prevent, monitor and control sea lice. Most of these technologies require detailed information on the behaviour, spatial distribution and demography of lice on host fish. This study investigated how salmon lice (Lepeophtheirus salmonis) infestation density...

article

Sterilization of sea lice eggs with ultraviolet C light: towards a new preventative technique for aquaculture

Luke T Barrett, Cassandra G Pert, Samantha Bui, Frode Oppedal, more

Pest Management Science > 76 > 3 > 901 - 906

BACKGROUND Sea lice infestations on Atlantic salmon (Salmo salar) farms are a considerable burden on the industry and put wild salmonid populations at risk. Frequent delousing treatments are necessary to keep lice densities below allowable limits, but currently viable treatments have drawbacks in terms of financial cost, animal welfare, or environmental impacts. We tested if 254 nm ultraviolet C...

article

Influence of experimental set‐up and methodology for measurements of metabolic rates and critical swimming speed in Atlantic salmon Salmo salar

Malthe Hvas, Frode Oppedal

Journal of Fish Biology > 95 > 3 > 893 - 902

In this study, swim‐tunnel respirometry was performed on Atlantic salmon Salmo salar post‐smolts in a 90 l respirometer on individuals and compared with groups or individuals of similar sizes tested in a 1905 l respirometer, to determine if differences between set‐ups and protocols exist. Standard metabolic rate (SMR) derived from the lowest oxygen uptake rate cycles over a 20 h period was statistically...

article

Behaviour in the toolbox to outsmart parasites and improve fish welfare in aquaculture

Samantha Bui, Frode Oppedal, Michael Sievers, Tim Dempster

Reviews in Aquaculture > 11 > 1 > 168 - 186

Host behaviour can prevent infection and moderate the fitness of parasites. Antiparasite behaviours are prevalent in many host–parasite systems and occur over fine or broad scales. With global growth in aquaculture production and the associated proliferation of parasites in farming systems, the behaviour of the fish being farmed has seldom been investigated in relation to parasites. Epidemics and...

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Repeated sublethal freshwater exposures reduce the amoebic gill disease parasite, Neoparamoeba perurans, on Atlantic salmon

Daniel William Wright, Barbara Nowak, Frode Oppedal, Phil Crosbie, more

Journal of Fish Diseases > 41 > 9 > 1403 - 1410

Freshwater bathing is one of the main treatment options available against amoebic gill disease (AGD) affecting multiple fish hosts in mariculture systems. Prevailing freshwater treatments are designed to be long enough to kill Neoparamoeba perurans, the ectoparasite causing AGD, which may select for freshwater tolerance. Here, we tested whether using shorter, sublethal freshwater treatment durations...

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Lowering treatment temperature reduces salmon mortality: a new way to treat with hydrogen peroxide in aquaculture

Kathy Overton, Francisca Samsing, Frode Oppedal, Lars H Stien, more

Pest Management Science > 74 > 6 > 1533 - 1533

article

Lowering treatment temperature reduces salmon mortality: a new way to treat with hydrogen peroxide in aquaculture

Kathy Overton, Francisca Samsing, Frode Oppedal, Lars H Stien, more

Pest Management Science > 74 > 3 > 535 - 540

BACKGROUND Hydrogen peroxide (H₂O₂) baths are widely used to reduce numbers of salmon lice on farmed Atlantic salmon. Fish mortalities often occur after baths, with warmer temperatures increasing lethality. We tested whether mortality could be reduced and lice removal efficacy maintained by lowering bath temperatures relative to ambient temperatures. Post‐smolt salmon infected with lice were held...

article

Cover Image, Volume 73, Issue 9

Frode Oppedal, Francisca Samsing, Tim Dempster, Daniel W Wright, more

Pest Management Science > 73 > 9 > i - i

The cover image, by Frode Oppedal et al., is based on the Research Article Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages, DOI: 10.1002/ps.4560.

article

Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages

Frode Oppedal, Francisca Samsing, Tim Dempster, Daniel W Wright, more

Pest Management Science > 73 > 9 > 1935 - 1943

BACKGROUND Salmon lice (Lepeophtheirus salmonis) are the most important parasites of farmed salmon. Infective larvae position themselves in the upper part of the water column to increase encounter probabilities with potential hosts. Previous studies have shown that a ‘snorkel’ sea‐cage technology protects salmon from infection in surface waters. We tested whether deep snorkels would more effectively...

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Search results for: Frode Oppedal

Fasting and its implications for fish welfare in Atlantic salmon aquaculture

Submerged cage aquaculture of marine fish: A review of the biological challenges and opportunities

Finding the needle in the haystack: Comparison of methods for salmon louse enumeration in plankton samples

Evolution of salmon lice in response to management strategies: a review

Tag use to monitor fish behaviour in aquaculture: a review of benefits, problems and solutions

Skeletal deformities in wild and farmed cleaner fish species used in Atlantic salmon Salmo salar aquaculture

Challenges and benefits of applying fish behaviour to improve production and welfare in industrial aquaculture

Fish welfare in offshore salmon aquaculture

Heart rates of Atlantic salmon Salmo salar during a critical swim speed test and subsequent recovery

Prevention not cure: a review of methods to avoid sea lice infestations in salmon aquaculture

The effect of temperature on ability of Lepeophtheirus salmonis to infect and persist on Atlantic salmon

Where art thou louse? A snapshot of attachment location preferences in salmon lice on Atlantic salmon hosts in sea cages

Sterilization of sea lice eggs with ultraviolet C light: towards a new preventative technique for aquaculture

Influence of experimental set‐up and methodology for measurements of metabolic rates and critical swimming speed in Atlantic salmon Salmo salar

Behaviour in the toolbox to outsmart parasites and improve fish welfare in aquaculture

Repeated sublethal freshwater exposures reduce the amoebic gill disease parasite, Neoparamoeba perurans, on Atlantic salmon

Lowering treatment temperature reduces salmon mortality: a new way to treat with hydrogen peroxide in aquaculture

Lowering treatment temperature reduces salmon mortality: a new way to treat with hydrogen peroxide in aquaculture

Cover Image, Volume 73, Issue 9

Sea lice infestation levels decrease with deeper ‘snorkel’ barriers in Atlantic salmon sea‐cages

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