Site Details: Sconser Quarry

Caol Mhor, Maol Ban
Sconser
IV48 8TD
Operator: Mowi Scotland Ltd
Water type: Seawater

Average female lice per fish

Source

Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Sconser Production cycle end date: Sep 2019
Total losses: 21 %

Sconser Quarry Production cycle end date: Nov 2019
Total losses: 2.1 %

Sconser Quarry Production cycle end date: May 2021
Total losses: 25.8 %

Sconser Production cycle end date: Sep 2021
Total losses: 7.8 %

Sconser Quarry Production cycle end date: Dec 2021
Total losses: 19.6 %

Sconser Quarry Production cycle end date: Feb 2024
Total losses: 20.1 %

Sconser Quarry Production cycle end date: Apr 2025
Total losses: 12.3 %

Sconser Quarry Production cycle end date: Jan 2026
Total losses: 15.5 %

Source

Fish Health Inspectorate mortality

Date:
21/11/22-27/11/22
Mortality:
16,154
Mortality Rate:
1.64%
Reason given: Gill Health Related
Gill Health Related
AGD
Mortality figures for wk48 indicate mortality is currently increasing. FHI to monitor.
Date:
28/11/22-04/12/22
Mortality:
41,907
Mortality Rate:
4.32%
Reason given: Gill infections
Gill infections
Mortality figures for wk49 indicate mortality is currently decreasing. FHI to monitor.
Date:
05/12/22-11/12/22
Mortality:
17,304
Mortality Rate:
1.87%
Reason given: Treatment Loss (Freshwater in wellboat)
Treatment Loss (Freshwater in wellboat)
Business correspondent contacted for further info. CGD on site, wellboat freshwater treatments completed week 50. Mortality reduced in week 50 but still above threshold. FHI to monitor.
Date:
12/12/22-18/12/22
Mortality:
12,974
Mortality Rate:
1.43%
Reason given: Treatment Loss (Freshwater in wellboat)
Treatment Loss (Freshwater in wellboat)
CGD on site, wellboat freshwater treatments completed week 50. FHI to monitor.
Date:
20/03/23-26/03/23
Mortality:
14,293
Mortality Rate:
2.24%
Reason given: Moritella
Moritella
Spoke to business. Moritella main cause but HSMI has also been detected on site. Site to reducing biomass by passive grading. FHI to monitor.
Date:
27/03/23-02/04/23
Mortality:
9,762
Mortality Rate:
1.57%
Reason given: Moritella
Moritella
Business contacted. Currently harvesting the worst affected pens and continuing to harvest. Freshwater treatment planned for calligus.
Date:
27/03/23-02/04/23
Mortality:
6,761
Mortality Rate:
1.18%
Reason given: Moritella
Moritella
Moritella and PGD are currently the main issues affecting mortality. The site treated with Alpha Max last week.
Site contacted for further information. FHI to monitor.
Date:
17/04/23-23/04/23
Mortality:
6,700
Mortality Rate:
1.41%
Reason given: Moritella and FW wellboat treatment
Moritella and FW wellboat treatment
Continuation of disease issues that have been an issue on site, numbers had reduced since the 2/4/23. FHI to monitor.
Date:
28/08/23-03/09/23
Mortality:
3,652
Mortality Rate:
1.54%
Reason given: Grilse
Grilse
First report since April 2023. FHI to monitor
Date:
04/09/23-10/09/23
Mortality:
2,727
Mortality Rate:
1.47%
Reason given: Grilse
Grilse
Slight decrease in mortalities for wk 36. Update 18/09/2023: Fallow late Sept/early Oct. Affected fish have been harvested out.
Second report of the year. FHI to monitor
Date:
02/10/23-08/10/23
Mortality:
4,513
Mortality Rate:
1.37%
Reason given: Bacterial
Bacterial
Contact operator to query stocking size/input
Date:
09/10/23-15/10/23
Mortality:
8,321
Mortality Rate:
2.56%
Reason given: Gills, aneamia and bacterial
Gills, aneamia and bacterial
Contacted health manager and he confirmed fish on site are 2022 Q4. Pasteurella has been detected on site and there are clinical signs of bacterial infection.
Health manager contacted for details of bacterial infection, FHI to monitor
Date:
16/10/23-22/10/23
Mortality:
6,613
Mortality Rate:
2.09%
Reason given: Gills, aneamia and bacterial
Gills, aneamia and bacterial
Contacted health manager and he confirmed fish on site are 2022 Q4. Pasteurella has been detected on site and there are clinical signs of bacterial infection.
Health manager contacted for details of bacterial infection, FHI to monitor
Date:
23/10/23-29/10/23
Mortality:
5,592
Mortality Rate:
1.8%
Reason given: Gills, aneamia and bacterial
Gills, aneamia and bacterial
Numbers are reducing FHI to monitor,
Date:
13/11/23-19/11/23
Mortality:
5,218
Mortality Rate:
1.0%
Reason given: Gill infection/Bacterial
Gill infection/Bacterial
Numbers are reducing, at 1%. FHI to monitor
Date:
20/11/23-26/11/23
Mortality:
6,717
Mortality Rate:
1.36%
Reason given: Bacterial
Bacterial
FHI to monitor
Date:
27/11/23-03/12/23
Mortality:
7,204
Mortality Rate:
1.48%
Reason given: Bacterial
Bacterial
FHI to monitor
Date:
04/12/23-10/12/23
Mortality:
4,878
Mortality Rate:
1.01%
Reason given: Bacterial
Bacterial
FHI to monitor.
Date:
12/02/24-18/02/24
Mortality:
5,142
Mortality Rate:
2.86%
Reason given: Treatment Loss
Treatment Loss
Business contacted: Salmosan treatment 14-15 February 2024, low level of underlying bacterial infection showing signs of Pasteurella skyensis (fish have been vaccinated for P. skyensis) but no actual outbreak of it on site. Fish showing signs of bacterial infection are the ones impacted by mortality.
Business contacted for additonal information. FHI to monitor.
Date:
30/12/24-05/01/25
Mortality:
4,583
Mortality Rate:
1.07%
Reason given: Treatment loss (FW in wellboat) / Gill infections
Treatment loss (FW in wellboat) / Gill infections
First report this cycle. FHI to monitor.
Date:
10/02/25-16/02/25
Mortality:
4,818
Mortality Rate:
1.32%
Reason given: Treatment loss (thermolicer)
Treatment loss (thermolicer)
Second report for this cycle. FHI to monitor.
Date:
27/10/25-02/11/25
Mortality:
9,110
Mortality Rate:
1.7%
Reason given: Gill infections
Gill infections
First report this cycle. FHI to monitor.
Date:
03/11/25-09/11/25
Mortality:
15,650
Mortality Rate:
2.97%
Reason given: Gill infections
Gill infections
Business contacted for additional information (received 14/11/25): FW treatment started on 08/11.
Second consecutive week. Business contacted for additional information. Mortality count and % updated following inspection of records on 29/5/2026. Minor discrepancy due to date report was initially submitted.
Date:
10/11/25-16/11/25
Mortality:
6,970
Mortality Rate:
1.75%
Reason given: Treatment Loss (FW in wellboat) / complex gill disease
Treatment Loss (FW in wellboat) / complex gill disease
Business previously contacted for additional information (received 14/11/25): FW treatment started on 08/11.Update 24/11 FW treatment completed on 15/11
Date:
24/11/25-30/11/25
Mortality:
7,169
Mortality Rate:
2.16%
Reason given: Gill infections
Gill infections
FHI to monitor.
Date:
01/12/25-07/12/25
Mortality:
4,795
Mortality Rate:
2.04%
Reason given: Gill infections
Gill infections
Business contacted for additional information: Site is harvesting and site is currently planned to fallow by the end of the month, subject to change.
Second consecutive week. Business contacted for additional information. FHI to monitor.
Date:
08/12/25-14/12/25
Mortality:
5,981
Mortality Rate:
2.09%
Reason given: Gill infections
Gill infections
Harvesting. Site predicted to fallow by end of December.
Third consecutive report. FHI to monitor.
Date:
15/12/25-21/12/25
Mortality:
3,366
Mortality Rate:
1.16%
Reason given: Gill infections
Gill infections
Fourth consecutive report. Mortalities have decreased from previous weeks. Business contacted for additional information. FHI to monitor.
Date:
29/12/25-04/01/26
Mortality:
750
Mortality Rate:
1.21%
Reason given: Harvesting
Harvesting
Site being harvested out.
FHI to monitor.
Date:
05/01/26-11/01/26
Mortality:
971
Mortality Rate:
1.58%
Reason given: Gill infections
Gill infections
Harvesting
Harvesting ongoing, actual number of fish on site low, resulting higher percentage mortality. FHI to monitor

Source

Inspection reports

Case Number: 2020-0462


Download Records inspected remotely on 30/10/2020.
Lumpfish from Ireland stocked on site during March, July, August and October. Majority coming on site in October. Cumulative mortality for lumpfish prior to October input 21%, significant proportion attributed to post treatment losses.
Salmosan treatment carried out 28/07 - 05/08
Thermolicer treatment 24-25/09
Freshwater treatment carried out 14-21/10 for treatment of AGD
Average adult female lice numbers rose above CoGP criteria for treatment but below FHI reporting levels w/b 06/07/20 and w/b 21/09/20. Subsequent treatments (shown above) reduced numbers significantly on both occasions.
Site thermometer used due to battery failure in FHI thermometer
2 mortalities observed across site, these were removed by site staff. No moribund or lethargic fish observed.
Fish sampled for VMD appeared healthy [Original PDF]

Case Number: 2021-0530


Download Remote inspection and physical inspection conducted by , observed by . Site thermometer used as inspector's thermometer not available. Only two cages stocked on site at the time of inspection due to harvesting. The site had experienced some mortality in October due to a previous gill insult/anaemia. The site was treated with freshwater in late
October followed by a Salmosan treatment in early November. From the inspection the fish appear healthy with no visible signs of disease observed. [Original PDF]

Case Number: 2023-0041


Download No issues observed on site, Salmosan treatment was being conducted at time of inspection. Fish sampled for VMD appeared in good condition. 2 dead observed across site, not fresh dead, therefore not sampled. Site staff removed these for disposal at time of inspection.
Site consists of 7 x 160m pens, all pens have pole supports for top nets rather than the central support. The use of the pole supports was reported to have removed the potential for losses due to concussion on the central net support.
Sites operated from Maol Ban shorebase are numbered sequentially from north to south - Sconser Quarry - Cages 1 - 7, Maol
Ban - Cages 8 - 12 and Cairidh -Cages 13 -17
Weather conditions very changeable during the inspection.
Sea lice numbers have been increasing, but still below the increased monitoring level. Targeted treatments were being conducted. [Original PDF]

Case Number: 2025-0089


Download Wild wrasse from around the shores of Skye.
Lumpfish stocked at 20g in Spring 2024. Unsure of the average weight at the date of the inspection
Erisort fish to be input this year in May already part grown.
Unlikely to use LUM in the next cycle.
Site almost completely harvested, just two cages remaining. The entire site will be fallow by the week after the inspection. [Original PDF]

Case Number: 2026-0193


Download Wrasse peaks in mortality, wk 42 815 (1.92%), wk 45 1091 (2.84%), wk 46 1329 (3.56%) all recorded as wounds/fin damage. wk 49 874 (3.12%), wk 51 1096 (4.09%) all recorded as atypical furunculosis
Wrasse peaks in mortality 2026 wk 2 2059 (8.05%) atypical furunculosis
Lumpfish mortalities were recorded in early 2025 but not elevated.
Peaks in salmon mortality 2025: wk 44 9110 (1.7%) gill health bacterial infection, wk 45 15650 (2.97%), wk 46 6970 (1.75%) mainly gill health but some well boat FW treatment losses, wk 48 (7169 (2.16%), wk 49 4795 (2.04%), wk 50 5981 (2.09%) Gill health, wk 51 3365 (1.16%) Gill health, HSMI and some pasteurella.
Peaks in salmon mortality 2026: wk 1 750 (1.21%), wk 2 971 (1.58%) gill health..
A treatment with SLICE administered in April, FW wellboat/FLS was used in late May early June 2025 and also November
2025. Alphamax was used in July and August.
Mortalities last four weeks: Wk 23 (to date of inspection) 96 (0.01%) Wk 22 441 (0.02%), wk 21 358 (0.02%), wk 20 142
(0.01%), wk 19 192 (0.01%). No cleaner fish on site.
Some sea water to sea water transfers from Cairidh and Tabhaigh (risk assessment in place).
Due to algal bloom at the time of the inspection feeding was restricted.
Very low levels of lice, zero observed on the fish sampled for VMD. [Original PDF]

Source