Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene
Atlantic salmon, Salmo salar, interact with humans during recreational and commercial activities, in both freshwater and marine environments. This involves routine hand netting, with a modest body of literature proving that handling techniques which reduce abrasion also minimises scale loss and like...
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ftunivstirling:oai:dspace.stir.ac.uk:1893/33680 2023-05-15T15:32:59+02:00 Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene Powell, Adam Universities Federation for Animal Welfare (UFAW) Universities Federation for Animal Welfare Machrihanish 2021 application/pdf http://hdl.handle.net/1893/33680 http://dspace.stir.ac.uk/retrieve/73a51158-740e-4617-b292-3b5f6118626d/Salmon%20mesh%202.%20UFAW%20grant%20report.%2025.20.21.pdf en eng Powell A (2021) Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene. UFAW. http://hdl.handle.net/1893/33680 1762975 http://dspace.stir.ac.uk/retrieve/73a51158-740e-4617-b292-3b5f6118626d/Salmon%20mesh%202.%20UFAW%20grant%20report.%2025.20.21.pdf Proper attribution of authorship and correct citation details should be given. animal welfare salmonid microbiology mesh skin damage aquaculture Project Report VoR - Version of Record 2021 ftunivstirling 2022-06-13T18:42:11Z Atlantic salmon, Salmo salar, interact with humans during recreational and commercial activities, in both freshwater and marine environments. This involves routine hand netting, with a modest body of literature proving that handling techniques which reduce abrasion also minimises scale loss and likely improves fish welfare. In a recent study, the use of a rubber mesh, compared to a knotless equivalent, was shown to reduce scale loss in two size cohorts of the study species during routine movement between tanks. The current study aimed to investigate this further via a Fluroscein dye technique, now commonly used to visualise cryptic damage to the mucus membranes of fish (eyes and more recently, skin). Although the technique was shown to work using easily available and cost-effective consumables, negligible damage was observed in any of the individually handled salmon regardless of mesh type. Previous studies have shown that the extent of observable skin damage is influenced by species, behaviour and anaesthetic technique. Although encouraging for this particular stock, it is unknown if higher net capture densities (i.e. more than one fish per net) or stock undergoing smoltification would be so robust. Scale loss data collected simultaneously proved a link between fish size and the extent of scale loss. A positive correlation was of individual smolts netted with knotless mesh. This was not significant for rubber mesh which showed low scale loss regardless of fish size, suggesting a further benefit of using the latter mesh type and supporting the findings of previous studies. Finally, in vitro microbiological study exposed sterile mesh fragments to effluent tank water allowing absorbance and adherence of bacteria to the mesh matrix. Subsequent incubation in sterile saline then permitted estimation of bacterial transfer between the exposed mesh to a further medium. Knotless mesh transferred more Vibrio spp. than rubber mesh, and this was significantly greater for total heterotrophic bacteria. This is likely due to ... Report Atlantic salmon Salmo salar University of Stirling: Stirling Digital Research Repository |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
topic |
animal welfare salmonid microbiology mesh skin damage aquaculture |
spellingShingle |
animal welfare salmonid microbiology mesh skin damage aquaculture Powell, Adam Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene |
topic_facet |
animal welfare salmonid microbiology mesh skin damage aquaculture |
description |
Atlantic salmon, Salmo salar, interact with humans during recreational and commercial activities, in both freshwater and marine environments. This involves routine hand netting, with a modest body of literature proving that handling techniques which reduce abrasion also minimises scale loss and likely improves fish welfare. In a recent study, the use of a rubber mesh, compared to a knotless equivalent, was shown to reduce scale loss in two size cohorts of the study species during routine movement between tanks. The current study aimed to investigate this further via a Fluroscein dye technique, now commonly used to visualise cryptic damage to the mucus membranes of fish (eyes and more recently, skin). Although the technique was shown to work using easily available and cost-effective consumables, negligible damage was observed in any of the individually handled salmon regardless of mesh type. Previous studies have shown that the extent of observable skin damage is influenced by species, behaviour and anaesthetic technique. Although encouraging for this particular stock, it is unknown if higher net capture densities (i.e. more than one fish per net) or stock undergoing smoltification would be so robust. Scale loss data collected simultaneously proved a link between fish size and the extent of scale loss. A positive correlation was of individual smolts netted with knotless mesh. This was not significant for rubber mesh which showed low scale loss regardless of fish size, suggesting a further benefit of using the latter mesh type and supporting the findings of previous studies. Finally, in vitro microbiological study exposed sterile mesh fragments to effluent tank water allowing absorbance and adherence of bacteria to the mesh matrix. Subsequent incubation in sterile saline then permitted estimation of bacterial transfer between the exposed mesh to a further medium. Knotless mesh transferred more Vibrio spp. than rubber mesh, and this was significantly greater for total heterotrophic bacteria. This is likely due to ... |
author2 |
Universities Federation for Animal Welfare (UFAW) Universities Federation for Animal Welfare Machrihanish |
format |
Report |
author |
Powell, Adam |
author_facet |
Powell, Adam |
author_sort |
Powell, Adam |
title |
Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene |
title_short |
Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene |
title_full |
Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene |
title_fullStr |
Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene |
title_full_unstemmed |
Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene |
title_sort |
optimising handling in salmon aquaculture (2): the effect of mesh type on cryptic lesions and hygiene |
publishDate |
2021 |
url |
http://hdl.handle.net/1893/33680 http://dspace.stir.ac.uk/retrieve/73a51158-740e-4617-b292-3b5f6118626d/Salmon%20mesh%202.%20UFAW%20grant%20report.%2025.20.21.pdf |
genre |
Atlantic salmon Salmo salar |
genre_facet |
Atlantic salmon Salmo salar |
op_relation |
Powell A (2021) Optimising handling in salmon aquaculture (2): The effect of mesh type on cryptic lesions and hygiene. UFAW. http://hdl.handle.net/1893/33680 1762975 http://dspace.stir.ac.uk/retrieve/73a51158-740e-4617-b292-3b5f6118626d/Salmon%20mesh%202.%20UFAW%20grant%20report.%2025.20.21.pdf |
op_rights |
Proper attribution of authorship and correct citation details should be given. |
_version_ |
1766363460779638784 |