Site Details: Sgian Dubh

Toward
Argyll
Argyll
PA23 7UJ
Operator: Bakkafrost Scotland
Water type: Seawater

Average female lice per fish

Source

Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Sgian Dubh Production cycle end date: Oct 2018
Total losses: 16.3 %

Sgian Dubh Production cycle end date: Sep 2020
Total losses: 39.4 %

Sgian Dubh Production cycle end date: Aug 2022
Total losses: 7.5 %

Sgian Dubh Production cycle end date: Jun 2024
Total losses: 32.9 %

Source

Fish Health Inspectorate mortality

Date:
04/07/22-10/07/22
Mortality:
2,411
Mortality Rate:
1.06%
Reason given: Gill Health Related
Gill Health Related
Harvests
Site has been harvesting since mid-June. Most recent harvests commenced in wk28 and site is expected to be fallow end of wk30. NFA.
Date:
11/07/22-17/07/22
Mortality:
2,578
Mortality Rate:
1.14%
Reason given: Gill Health Related
Gill Health Related
Harvests - to be fallow wk 30
Site fallow
Date:
18/07/22-24/07/22
Mortality:
2,587
Mortality Rate:
2.08%
Reason given: Gill Health Related
Gill Health Related
Harvests - to be fallow wk 30
Now fallow. No further action.
Date:
28/08/23-03/09/23
Mortality:
26,878
Mortality Rate:
2.58%
Reason given: Bacterial Disease; Gill Health Related
Bacterial Disease; Gill Health Related
FW wk 36. Positive for SRS and furunculosis but gill health is the primary factor in mortality.
First report this cycle. FHI to monitor following FW treatment.
Date:
04/09/23-10/09/23
Mortality:
31,704
Mortality Rate:
3.12%
Reason given: Bacterial Disease; Gill Health Related
Bacterial Disease; Gill Health Related
FW wk 36
Contacted business for more info - started as quite pen specific mortality but seeing more across site. Poor water quality and gill health main cause but also bacterial challenges with SRS. Week 37 mortality looking similar to what was reported in wk 36. Likely another FW treatment will be planned. Routine visit due and has been brought forward to week 40
Date:
11/09/23-17/09/23
Mortality:
34,181
Mortality Rate:
3.47%
Reason given: Bacterial Disease; Gill Health Related
Bacterial Disease; Gill Health Related
Business contacted: FW and FLS treatment to be carried out this week, from cages treated so far clearance reportedly seems to be good with low levels of mortality. Water temperature has dropped recently. SRS and AGD diagnosed on site. FHI inspection scheduled. FHI to monitor
Date:
18/09/23-24/09/23
Mortality:
21,593
Mortality Rate:
2.27%
Reason given: Bacterial Disease; Gill Health Related
Bacterial Disease; Gill Health Related
FW treatment week 39/40 (25/09-08/10/2023)
FHI to visit
Date:
25/09/23-01/10/23
Mortality:
14,932
Mortality Rate:
1.61%
Reason given: Bacterial Disease; Gill Health Related
Bacterial Disease; Gill Health Related
FW week 40
FHI to visit
Date:
02/10/23-08/10/23
Mortality:
14,119
Mortality Rate:
1.54%
Reason given: Bacterial Disease; Gill Health Related
Bacterial Disease; Gill Health Related
Site contacted for further information. Gill health issued have occured due to a recent jellyfish insult on the gills. SRS has also been confirmed onsite. The site treated with FW in week 40, post treatment, lesions present on some of the stocks are showing signs of healing and gill health appears to be improving along with an increased feeding response.
FHI to monitor.
Date:
09/10/23-15/10/23
Mortality:
11,046
Mortality Rate:
1.23%
Reason given: Bacterial disease; Gill health related
Bacterial disease; Gill health related
FW week 40; FW schedules wk 43
FHI visited 4/10/23.
Date:
23/10/23-29/10/23
Mortality:
11,726
Mortality Rate:
1.33%
Reason given: Gill Health Related; Bacterial Disease
Gill Health Related; Bacterial Disease
Targeted FW wk 43/44
FHI visited 4/10/23. To monitor

Source

Inspection reports

Case Number: 2020-0342


Download Mortality information (last 4 weeks)
Week 33 - 102344 - 39.55%
Week 32 - 11582 - 2.12%
Week 31 - 5107 - 1.46%
Week 30 - 7464 - 1.82%
Week 49 (2019) - 13048 - 1.58%
Week 46 (2019) - 15895 - 1.76%
Sgian dbhu has been one of the worst affected sites in loch striven due to historic levels of PD and AGD levels, higher biomass may have exacerbated effects of environmental insult, site is also closest to the freshwater run off and therefore would have been the most exposed to suspended solids in the loch after the extreme recent downpour.
Dinoflagellate combined with solids in water after heavy rainfall resulted in environmental insult. Mortality is now back at normal levels and appetite are doing well.
Fish have been doing really well but have succumbed to an environmental insult caused by a multitude of factors in the loch.
Environmental event lasted only a few days and mortality levels are back to normal. Harvesting procedures have commenced and fallow is expected within the month. Environmental insult combined with historic PGD is thought to have been the main source of high mortality. [Original PDF]

Case Number: 2021-0245


Download Fished sampled for VMD looked in good condition. Fish were feeding very deep.
Water temperature was found to be above 14 degrees Celsius. So full ECI could not be completed. Case type changed to
REG [Original PDF]

Case Number: 2021-0451


Download Inspection conducted by , observed by .
The main population looked healthy, feeding deep in the water column. One dead fish and a small number of lethargic fish observed. One moribund seen in pen 8 and taken out for diagnostic sampling.
The site has been inspected on the 15/07/2021 but the water temperature was found to be above 14 degrees Celsius. So full
ECI could not be completed. Case type changed to REG, CNI, SLI. Biosecurity, containment and sea lice records were found to be adequately maintained and therefore they have not been inspected again. [Original PDF]

Case Number: 2023-0460


Download Salmon came march this year, wrasse in June
Stock on site have come from - Applecross, Kinlochmoidart, Harris Lochs, Hebridean Smolt (Clachen Hatchery) and
Couldoran - Most stock are native Hebridian.
Wrasse mortalities - Wk38 - 2.48% (1,321), Wk37 - 2.92% (1,600), Wk36 - 2.98% (1,470), Wk35 - 2.88% (1,250). Wrasse mortality attributed to environmental reasons - jellyfish, possible pollution from forestry upstream (wrasse don't like suspended solids in the water).
Freshwater treatments last week and the rest of the site is being treated tonight.
Latest health report - systemic bacterial infection. Furunculosis, suspected Tenacibaculum sp., mixed gill infections with AGD,
Branchiomonas-like epitheliocysts and lamellar pathology suspicious of infection with Desmozoon lepeophtherii. Waterborne environmental damage to gills - possibly jellyfish or stinging cell contact.
Health team including head vet are on site today to collect samples for general health screening.
Sealice - SLICE was a precautionary measure.
During physical inspection of the site, 4 out of 16 pens had a couple of mortalities observed on the surface of the water. No moribund fish were observed on site. A handful of lethargic fish were observed across the whole site but when approached all fish swam off quickly. Water visibility on site was poor due to the large volume of freshwater input from the recent wet weather.
Fish that were observed were shoaling a few feet below the water surface.
Fish for VMD samples were collected from pens 1, 4 and 10. Fish sampled for VMD appeared healthy both externally and internally with no lice observed on any fish collected. [Original PDF]

Source