Site Details: West of Burwick

Gremista
Lerwick
ZE1 0PX
Operator: Scottish Sea Farms Ltd
Water type: Seawater

Average female lice per fish

Source

Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

West of Burwick Production cycle end date: Sep 2019
Total losses: 35.8 %

West of Burwick Production cycle end date: Jun 2021
Total losses: 13.9 %

West of Burwick Production cycle end date: Aug 2023
Total losses: 37.1 %

Source

Fish Health Inspectorate mortality

Date:
24/10/22-30/10/22
Mortality:
2,440
Mortality Rate:
1.10%
Reason given: Gill Health Related
Gill Health Related
CGD; post FW wellboat treatment
Site contacted for further information. Post treatment mortality following a FW treatment which was conducted during a transfer from North Papa to West of Burwick on 25/10/2022. FHI to monitor.
Date:
09/01/23-15/01/23
Mortality:
4,390
Mortality Rate:
1.30%
Reason given: Gill health related
Gill health related
CGD, post wellboat paramove treatment
Historical mortaility event picked up during inspection. No further action
Date:
16/01/23-22/01/23
Mortality:
8,945
Mortality Rate:
2.60%
Reason given: Gill health related
Gill health related
CGD, post wellboat paramove treatment
Historical mortaility event picked up during inspection. No further action
Date:
13/02/23-19/02/23
Mortality:
3,787
Mortality Rate:
1.10%
Reason given: Gill Health related
Gill Health related
CGD
Business correspondent contacted. Mortality appears to be below threshold in week 8. FHI to monitor.
Date:
06/03/23-12/03/23
Mortality:
3,774
Mortality Rate:
1.20%
Reason given: Virus disease
Virus disease
CMS; destocking through harvest
FHI to monitor
Date:
22/05/23-28/05/23
Mortality:
2,470
Mortality Rate:
1.10%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD, CMS; Destocking through harvest
Site is currently reducing stock numbers on site via harvesting. FHI to monitor
Date:
26/06/23-02/07/23
Mortality:
2,654
Mortality Rate:
1.7%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest; Business contacted: Site planned fallow August/September 2023.
Business contacted for additional information. FHI to monitor.
Date:
03/07/23-09/07/23
Mortality:
6,948
Mortality Rate:
4.50%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest
Site contacted for further information, FHI to monitor.
Date:
10/07/23-16/07/23
Mortality:
3,037
Mortality Rate:
2.10%
Reason given: Virus disease, Sea lice related
Virus disease, Sea lice related
CMS, post wellboat FW treatment
Historical mortaility event picked up during inspection. No further action
Date:
17/07/23-23/07/23
Mortality:
4,132
Mortality Rate:
2.9%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest
Business contacted for additional information. FHI to monitor.
Date:
24/07/23-30/07/23
Mortality:
6,157
Mortality Rate:
4.40%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest; business contacted - possible fallow by End of August
FHI to monitor.
Date:
31/07/23-06/08/23
Mortality:
8,579
Mortality Rate:
6.40%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest
FHI to monitor - Site due to fallow by end of August
Date:
07/08/23-13/08/23
Mortality:
5,433
Mortality Rate:
4.30%
Reason given: Virus Disease
Virus Disease
CMS; Destocking through harvest
FHI to monitor - Site due to fallow by end of week 34
Date:
14/08/23-20/08/23
Mortality:
5,420
Mortality Rate:
5.60%
Reason given: Virus Disease
Virus Disease
CMS; Destocking through harvest
Site due to fallow end of August. FHI to monitor.
Date:
21/08/23-27/08/23
Mortality:
1,160
Mortality Rate:
1.70%
Reason given: Virus Disease
Virus Disease
CMS; Destocking through harvest
Site fallow.

Source

Inspection reports

Case Number: 2020-0338


Download Mortalities have been very low throughout cycle since stocking. Monitored daily by camera.
Sea lice counts very low. Sea lice skirts were in place prior to stocking and just recently removed. Two slice treatments administered one in April and one in July - July treatment due to slight rise in Caligus numbers observed. A wellboat bath treatment with salmosan also conducted for gill health and sea lice, a few leps observed and caligus. 100% clearance after treatment and improvement in gill health. Company generally favour freshwater for sea lice treatments, however other methods are available - chemotherapeutants and optilicer. Details of decision making process for choosing intervention not written into sea lice management plan - to look further into this.
Predator nets and top nets in place - no predator issues.
All records except movement records inspected by remotely.
Site inspection and sampling by
Fish sampled for VMD appeared healthy, site manager reported that gill health had imporved on previous so far. Fish reportedly growing well. FW treatments have been working well and site have been conducting these at lower stocking densities. [Original PDF]

Case Number: 2022-0568


Download Last transfer of fish onto site was on 13/11/2022 from Setter Voe.
Half of site is stocked from Setter Voe and the other half from Migdale.
Only a couple or moribunds across whole site.
Mortalities are usually ensiled on site. Small, amounts picked up by SEM, larger mortalities are handled by Pelagia.
Site inspection and paperwork conducted by , supervised by . VMD samples taken by [Original PDF]

Case Number: 2024-0422


Download After input of Salmon onto site, stock was observed to have fungal and bacterial gill issues. This elevated mortalities but was not above the reporting threshold.
Currently onsite the stock have been observed to have low to moderate background levels of AGD (pharmaq health reports confirmed this in report date 05/11/2024 4/10 fish tested positive with AGD and 25/10/2024 5/10 fish test positive for AGD).
This has not caused mortalities to be elevated. Site representative suggested potentially conducting a FW treatment for AGD soon as a preventative measure.
SLICE treatments were conducted on 26/10/2024 and 09/09/2024.
Wrasse mortalities in the last 4 weeks - wk45 1 (0.01%), wk44 1 (0.01%), wk43 0 (0.0%), wk42 1 (0.01%).
Salmon mortalities in the last 4 weeks - wk45 0.2%, wk44 1 0.2%, wk43 0.4%, wk42 0.2%.
Salmon stock on site were shoaling well deep in the water column and had a good feed response, this was observed whilst onsite and the use of site feeding cameras. Wrasse stock were in good condition and were feeding/ swimming well, this was observed whilst onsite and the use of site feeding cameras. 12 fish were sampled for VMD and were dispatched via Tricaine.
Sampled VMD fish had good body condition and internally were observed to be in good condition.
EC inspection and paperwork was conducted onsite by whilst supervised by . VMD fish was sampled by whilst supervised by .
Wrasse and salmon mortality and sea lice records inspected remotely on 18/11/2024 by whilst supervised by .
Mortality information received regarding issues raised on 18/11/2024. Inspected on 19/11/2024 by whilst supervised by
and was found to be satisfactory.
CNA inspection and paperwork was partially conducted on site on 12/11 and completed remotely on 21/11/2024 by whilst shadowed by
Following issues raised during the inspection, records were received from the site operator on 18/11/2024, 02/12/2024 and
21/01/2025 and were inspected by whilst supervised by and found to be satisfactory. [Original PDF]

Source