Effect of pancreas disease (PD) on quality attributes of raw and smoked fillets of Atlantic salmon (Salmo salar L.)

Lerfall, Jørgen; Larsson, Thomas; Birkeland, Sveinung; Taksdal, T; Dalgaard, Paw; Afanasyev, Sergey; Bjerke, Målfrid Tofteberg; Mørkøre, Turid

doi:10.1016/j.aquaculture.2011.11.003

Cited by 30 publications

(34 citation statements)

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“…1B). The contents of dry matter, total fat, protein and astaxanthin were measured, as earlier described by Lerfall et al (2012). Dry matter was estimated gravimetrically after drying at 105°C for 24 h (ISO., 1983), total fat was extracted and calculated by the method of Bligh and Dyer (1959), with slight modifications, nitrogen content was measured on a Tecator Kjeltec system (Model 2020 Digestor and 1026 Distilling unit, Tecator, Höganäs, Sweden) (NCFA., 2003) and the protein content was calculated from nitrogen measurements, using the formula: %protein = %nitrogen Â 6.25.…”

Section: Chemical Composition Astaxanthin and Surface Colourmentioning

confidence: 99%

Pre-mortem stress and the subsequent effect on flesh quality of pre-rigor filleted Atlantic salmon (Salmo salar L.) during ice storage

et al. 2015

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Section: Chemical Composition Astaxanthin and Surface Colourmentioning

confidence: 99%

Pre-mortem stress and the subsequent effect on flesh quality of pre-rigor filleted Atlantic salmon (Salmo salar L.) during ice storage

et al. 2015

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“…Mortality rates can reach up to 63% for sites that are severely affected by PD and among surviving fish, subsequent failure to grow may cause thin fish with poor condition (runts) and high number of discarded fish at slaughter (reviewed by Jansen et al., ). Several studies have found that PD may also impair the fillet quality of slaughter sized salmon (Larsson et al., ; Lerfall et al., ; Taksdal, Wiik‐Nielsen, Birkeland, Dalgaard, & Mørkøre, ). A newly published economic simulation showed that PD caused a total direct cost for Norwegian fish farmers in 2015 of 2,366–2,775 million NOK (Vedeler, ).…”

Section: Introductionmentioning

confidence: 99%

Increased dietary protein‐to‐lipid ratio improves survival during naturally occurring pancreas disease in Atlantic salmon, Salmo salar L.

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et al. 2018

Journal of Fish Diseases

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This study demonstrated that increased dietary protein‐to‐lipid ratio (P/L‐ratio) improved survival of farmed Atlantic salmon naturally affected by pancreas disease (PD). In addition to diet, body weight (BW) and delousing mortality prior to the PD outbreak also contributed significantly (p < 0.05) to explain the observed variation in PD‐associated mortality. Subsequent to the PD outbreak, large amount of fish failed to grow and caused thin fish with poor condition (runts). At the end of the trial, significantly (p < 0.05) lower amounts of runt fish and increased amount of superior graded fish where detected among fish fed increased P/L‐ratio and within the fish with the largest BWs prior to PD. Diet, BW and delousing mortality contributed significantly (p < 0.05) to explain the variation in the amount of superior graded fish, whereas BW and diet explained the variation in the amount of runt fish. A significant (p < 0.01) negative linear relationship was observed between the amount of superior graded fish and the total mortality, whereas a positive linear relationship was detected between percentage of fillets with melanin and the total mortality. Thus, increased dietary P/L‐ratio seem to reduce the mortality and impaired slaughter quality associated with PD.

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“…SAV infections may result in growth retardation, muscle myopathy, lower fillet quality and up to 48% mortality. Therefore, SAV infections pose a major burden on aquaculture of these high value fish species (Hodneland et al, 2005;Lerfall et al, 2012;McLoughlin and Graham, 2007). Vaccination of young salmon parr with a commercial inactivated whole virus vaccine provides effective protection against SAV infection.…”

Section: Introductionmentioning

confidence: 99%

“…At present, at least six different SAV subtypes have been distinguished based on genotype and geographic distribution (Fringuelli et al, 2008;Graham et al, 2012;Graham et al, 2011). Infections may lead up to 48% mortality and deteriorated fillet quality (Lerfall et al, 2012). Salmonid alphavirus 3 (SAV3) is originally found in Norway and infection of salmon results in loss of appetite, impaired swimming behaviour and myopathy of heart and skeletal muscles (Hodneland et al, 2005).…”

Section: Introductionmentioning

confidence: 99%

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Next-generation salmonid alphavirus vaccine development

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Aquaculture is essential to meet the current and future demands for seafood to feed the world population. Atlantic salmon and rainbow trout are two of the most cultured aquaculture species. A pathogen that threatens these species is salmonid alphavirus (SAV). A current inactivated virus vaccine against SAV provides cross-protection against all SAV subtypes in salmonids and reduces mortality amongst infected fish. However, protection is not 100% and due to virus growth at low temperature, the vaccine production process is time consuming. In addition, the vaccine needs to be injected into the fish, which is a cumbersome process. The work described in this thesis aimed to increase the general knowledge of SAV and to assess current vaccine technologies, and to use this knowledge in designing next-generation vaccines for salmonid aquaculture.An alternative cell line to support SAV proliferation was identified, however, the virus production time could not yet outcompete the current SAV production system. Making use of the baculovirus insect cell expression system, multiple enveloped virus-like particle (eVLP), and core-like particle (CLP) prototype vaccines were produced in insect cells at high temperature. An in vivo vaccination study showed, however, that these vaccines could not readily protect Atlantic salmon against SAV. The low temperaturedependent replication of SAV was attributed to the glycoprotein E2, and it was found that E2 only correctly travelled to the cell surface at low temperature, and in the presence of glycoprotein E1. The biological impact of this finding was confirmed in the development and in vivo testing of a DNA-launched replicon vaccine. The effective DNAlaunched replicon vaccine was extended by delivery of the capsid protein in trans. It was hypothesized that viral replicon particles (VRP) were formed in vivo, which would cause an additional single round of infection and might further elevate the immune response in comparison to the replicon vaccine. A second animal trial indicated that the inclusion of capsid did not yet improve vaccine efficacy. This trial however did show that a DNA vaccine transiently expressing the SAV structural proteins provided superior protection over both replicon vaccines (with and without capsid).In this thesis, some virus characteristics, such as the cause of temperature-dependency of SAV replication, of an unique aquatic virus were further explored. The production and in vivo testing of multiple next-generation vaccines defined the prerequisites for induction of a potent immune response in Atlantic salmon. A prototype DNA-launched replicon vaccine has shown potential for further development. The research described in this thesis contributes to the development of next-generation vaccines in the challenging area of fish vaccinology. (European Commission, 2015). Aquaculture is indispensable, as wild-catch of seafood cannot meet the growing human consumption demands. In addition, aquaculture may allow the recovery of those wild fish stocks that have been ...

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Effect of pancreas disease (PD) on quality attributes of raw and smoked fillets of Atlantic salmon (Salmo salar L.)

Cited by 30 publications

References 36 publications

Pre-mortem stress and the subsequent effect on flesh quality of pre-rigor filleted Atlantic salmon (Salmo salar L.) during ice storage

Pre-mortem stress and the subsequent effect on flesh quality of pre-rigor filleted Atlantic salmon (Salmo salar L.) during ice storage

Increased dietary protein‐to‐lipid ratio improves survival during naturally occurring pancreas disease in Atlantic salmon, Salmo salar L.

Next-generation salmonid alphavirus vaccine development

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