Site Details: Westerbister

Orkney Regional Office
Scapa
Orkney
KW15 1SD
Operator: Scottish Sea Farms Ltd
Water type: Seawater

Average female lice per fish

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Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Westerbister Production cycle end date: May 2018
Total losses: 5.3 %

Westerbister Production cycle end date: Apr 2020
Total losses: 10.2 %

Westerbister Production cycle end date: Mar 2022
Total losses: 23.7 %

Westerbister Production cycle end date: May 2024
Total losses: 24.6 %

Source

Fish Health Inspectorate mortality

Date:
24/07/23-30/07/23
Mortality:
6,703
Mortality Rate:
1.40%
Reason given: Gill Health
Gill Health
CGD; post plankton insult to gills; business contacted environmental insutl in Scappa Flow,no planned fallow yet
FHI visit scheduled.
Date:
21/08/23-27/08/23
Mortality:
18,415
Mortality Rate:
3.90%
Reason given: Environmental; Gill Health
Environmental; Gill Health
CGD; low DO
FHI visit carried out on 15/08/2023 (case number: 2023-0352). No clinical signs of disease observed so no samples taken for diagnostic analysis. Poor gill health was reported to be exacerbated by low DO and the presence of microjelly fish. Company biologist has been in attendance routinely to take histology and blood samples. Fish appeared in good health during inspection. Fish removed for routine residue samples appeared healthy externally and internally.
Date:
04/12/23-10/12/23
Mortality:
9,661
Mortality Rate:
2.60%
Reason given: Gill Health related
Gill Health related
CGD; Destocking through harvest
1st report since WK34. FHI to monitor.
Date:
18/12/23-24/12/23
Mortality:
3,549
Mortality Rate:
1.1%
Reason given: Gill Health related; bacterial disease
Gill Health related; bacterial disease
CGD; Destocking through harvest
Mortalities decreased since start of month, now just over 1%, FHI to monitor.
Date:
01/04/24-07/04/24
Mortality:
3,258
Mortality Rate:
1.20%
Reason given: Gill Health related
Gill Health related
CGD; Destocking through harvest. Business contacted: Site expected to fallow in May, weather permitting.
FHI to monitor.
Date:
22/04/24-28/04/24
Mortality:
1,558
Mortality Rate:
1.1%
Reason given: Virus disease
Virus disease
CMS; Harvesting to fallow
FHI to monitor.
Date:
29/04/24-05/05/24
Mortality:
598
Mortality Rate:
1.10%
Reason given: Virus disease
Virus disease
CMS; Harvesting to fallow. Business contacted: site now confirmed to be fallow.
Business contacted for information on sites fallowing. FHI to monitor.

Source

Inspection reports

Case Number: 2021-0356


Download Stock on site inputted in July 2020 from Barcaldine
Risk assessment in place to support the case of non-synchronous fallow of the area
Slice treatments in fish which went to Hunda for caligus and in summer for Leps
Average female leps - 1.39 week 37; 1.34 week 36; 1.80 week 35; 1.34 week 34
Site to stock wrasse (local wild caught from Orkney) to help combat rising sea lice levels. Stock due in 8 October 2021.
Reported loss of stock upon input - captured through supplier mortality records.
Paperwork inspection by virtual meeting - Thursday 30 September 2021 - and
Site inspection by and . Samples from fish 1, fish 2 and fish 3 - pools 1 and 2 taken by . Samples from fish 4 and
5 - pool 3, and VMD samples from fish 6 and 7 taken by under the supervision of
Oxygen levels satisfactory on site and temperature beginning to drop. It is hoped that this will help to alleviate mortality issues.
Several moribund, lethargic and dead fish observed across the site. [Original PDF]

Case Number: 2023-0352


Download Salmon on site originated from Stofinfisker and came on from Barcaldine Smolt Unit (FS1328). Salmon have been suffering from poor gill health during the last few weeks with pale, bleeding and necrotic gills being observed.
Company biologist attends the site every month as a minimum to collect routine histology and blood samples. Body condition is also scored and gills are checked.
Slice was completed end of june/beginning of july. Since input, the site has also done an Azasure treatment (Dec 22), peroxide
(Dec 22), thermolicer (Feb 23), freshwater treatments (May 23) and a hydrolicer (July 23).
FMA not fallowed synchronously, but RA available and found to be adequate.
Fish on site appeared in good health and were actively shoaling in the cages. 2 moribunds were observed across the site but were runts with no clinical signs of disease so were not removed for sampling.
Fish sampled for VMD appeared healthy externally and upon internal examination. [Original PDF]

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