Site Details: Calva Bay (Calbha Beag)

Badcall Salmon House
Scourie, Lairg
Sutherland
IV27 4TH
Operator: Loch Duart Ltd
Water type: Seawater

Average female lice per fish

Source

Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Calbha Bay Production cycle end date: Apr 2018
Total losses: 39.6 %

Calbha Bay Production cycle end date: May 2020
Total losses: 41.2 %

Calbha Bay Production cycle end date: Jul 2024
Total losses: 11.8 %

Calbha Bay Production cycle end date: Apr 2026
Total losses: 24.6 %

Source

Fish Health Inspectorate mortality

Date:
07/02/22-13/02/22
Mortality:
2,134
Mortality Rate:
1.54%
Reason given: Predation
Predation
Spoke with business correspondant. The site is still experiancing some predation loss. They are managing the morts daily. FHI to monitor.
Date:
04/08/25-10/08/25
Mortality:
3,531
Mortality Rate:
1.43%
Reason given: Treatment losses with secondary environmental issues (gills compromised by jelly fish)
Treatment losses with secondary environmental issues (gills compromised by jelly fish)
Freshwater/FLS treatments ongoing
FHI to monitor
Date:
18/08/25-24/08/25
Mortality:
2,769
Mortality Rate:
1.18%
Reason given: Treatment losses with secondary environmental issues (gills compromised by jelly fish) and predation
Treatment losses with secondary environmental issues (gills compromised by jelly fish) and predation
Treatments completed 18/8/25. Site fitted with HDPE pen nets & predator net. No further notifications expected from the site opperator at this point
FHI to monitor.
Date:
08/09/25-14/09/25
Mortality:
2,750
Mortality Rate:
1.2%
Reason given: Seal Predation and CGD
Seal Predation and CGD
Predator nets deployed
FHI to monitor.
Date:
13/10/25-19/10/25
Mortality:
2,972
Mortality Rate:
1.34%
Reason given: CGD/Sea Lice Treatment/AGD
CGD/Sea Lice Treatment/AGD
Site treating with salmosan FW Bath Planned
FHI visited 22/10/25 (case number 2025-0401), no diagnostic samples collected. FHI to monitor.
Date:
20/10/25-26/10/25
Mortality:
4,992
Mortality Rate:
2.29%
Reason given: CGD/Sea Lice Treatment/AGD
CGD/Sea Lice Treatment/AGD
Salmosan treatments complete. FW Bath Planned
FHI visited 22/10/25 (case number 2025-0401), no diagnostic samples collected. FHI to monitor.
Date:
27/10/25-02/11/25
Mortality:
2,394
Mortality Rate:
1.12%
Reason given: CGD/Sea Lice Treatment/AGD
CGD/Sea Lice Treatment/AGD
FW Bath with FLS Planned
FHI visited 22/10/25 (case number 2025-0401), no diagnostic samples collected. FHI to monitor.
Date:
03/11/25-09/11/25
Mortality:
2,240
Mortality Rate:
1.06%
Reason given: CGD/AGD
CGD/AGD
FW/FLS Treatment Planned End week 47
FHI visited 22/10/25 (case number 2025-0401), no diagnostic samples collected. FHI to monitor.
Date:
10/11/25-16/11/25
Mortality:
2,372
Mortality Rate:
1.14%
Reason given: CGD/AGD
CGD/AGD
FW/FLS Treatment Planned to commence end of week 47
FHI visited 22/10/25 (case number 2025-0401), no diagnostic samples collected. FHI to monitor.
Date:
17/11/25-23/11/25
Mortality:
3,455
Mortality Rate:
1.68%
Reason given: CGD/AGD
CGD/AGD
FW FLS treatment commenced
FHI visited 22/10/25 (case number 2025-0401), no diagnostic samples collected. FHI to monitor.
Date:
24/11/25-30/11/25
Mortality:
2,523
Mortality Rate:
1.24%
Reason given: CGD/AGD/Post Handling
CGD/AGD/Post Handling
FW FLS completed
FHI visited 22/10/25 (case number 2025-0401), no diagnostic samples collected. FHI to monitor.
Date:
30/03/26-05/04/26
Mortality:
595
Mortality Rate:
3.02%
Reason given: Seal damage
Seal damage
Sped up Harvesting. Site Fallowed Week 15
Site fallow. No further action.
Date:
06/04/26-12/04/26
Mortality:
213
Mortality Rate:
6.16%
Reason given: Seal damage
Seal damage
Seal damage, 1 Pen of fish left on site being tagerted.
Site fallow. No further action.

Source

Inspection reports

Case Number: 2021-0168


Download Remote inspection done on the 28/05/21 by , supervised by . Physical inspection done on 02/06/2021 by supervised by .
Mortality event wk 34 2019 to wk 8 2020 - reported - gill health issues
2020 wk 10 - 665 fish (1.04%) wk 17 490 fish (1.06%) - not reported at the time, report received 28/05/2021
Freshwater treatments 28 - 30 April and 1 - 7 May 2021 for AGD
Paramove 50 treatments in Nov and Dec 2020 for AGD
No issues on site. Fish looked healthy when sampled for by for VMD (observed by ). [Original PDF]

Case Number: 2024-0007


Download Paperwork completed remotely on 25/01/2024 by , observing. Physical inspection lead by on 07/02/2024, observed by .
Primary cause for mortality is predation
Apr, Jun, Aug 2023: freshwater treatments. Jan 2023 and Mar 2023: Paramove 50 treatments. Both treatments used to combat gill health issues. All cages treated within the same week. Area treated synchronously.
Mostly wild origin wrasse on site caught off coast of Skye, Sutherland and Cornwall. Some WRS from Otter Ferry
Optomease used to anaesthetize closer to harvest time.
ADDs on site licensed by NatureScot as they company hold a research license. The license allows the company to use an
ADD to deter cetaceans in exchange for information.
In the process of replacing all nylon nets with anti-predator nets. At the time of the inspection two cages had already had the anti-predator nets installed, the others will be installed in due course.
Approx 6 fish observed with signs of predator attack.
Fish sampled for VMD appeared clinically healthy and no signs of disease internally.
Hides for wrasse in place.
Calibrated site thermometer used to take temperature. Due to sub-zero temperature, temperature was not displayed on inspectors field thermometer. FHI 045 Thermometer fail sheet completed. [Original PDF]

Case Number: 2025-0401


Download Input Oct/Nov 2024 from Badcall Bay (FS0067).
Salmosan treatment weeks 42/43.
Recent mortalities:
SAL Week 42: 1.34%; Week 41: 0.87%; Week 40: 0.33%; Week 39: 0.62%
WRA Week 42: 0.02%; Week 41: 0.05%; Week 40: 0.02%; Week 39: 0.02%
Cleanerfish stocked week 36/37. Cleanerfish delivery was supposed to be earlier, however other Loch Duart Plc sites were prioritised instead as sea lice numbers were higher elsewhere at the time. Sea lice numbers became elevated on site in week 37 (4.67 adult females/fish), by then the cleanerfish delivery had been completed and the company decided to allow 2 weeks for the cleanerfish to have an effect on the lice load. By week 39 the sea lice counts had risen to 7.52 so a Salmosan treatment was planned for week 40. This could not be completed due to weather, and was therefore postponed to week 42 (other sites in the area are also currently affected by high lice loads and therefore treatments need to be prioritised among farms).
Ongoing strategy for the prevention, control and reduction of lice:Salmosan, freshwater and FLS treatments will be ongoing to establish and maintain control over lice numbers on site. Cleaner fish stocking strategies will also be maintained. The Kvaloy is now chartered full time to Loch Duart Plc and an adjustable grader is to be fitted to facilitate the easier removal of cleaner fish from pens (so cleaner fish and FW treatments can be used simultaneously). Currently only fish above an average size of 2.8kg can be removed. The Aqua Viking will also be available full time for treatments from the 28/10/25. Tarp treatments will also be available but as a last resort dependent on weather and tidal conditions.
The main population appeared in good condition, shoaling deep in the water column and with a good feeding response. A small number of lethargic fish were observed and 2 dead fish were seen on site. The lethargic fish appeared to be mostly runts. Skin abrasions along the flanks and head damage could be observed on these fish and on a small amount of the main population. No fish with red heads observed. Some of the fish removed for the sea lice counts had evidence of skin damage, especially between the anal and pelvic fin, however there was evidence of treatment/cleanerfish clearance as most of these areas were clear of parasites. [Original PDF]

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