Site Details: Groatay

Hoebeg Cheesebay
Loch Maddy
North Uist
HS6 5AT
Operator: Mowi Scotland Ltd
Water type: Seawater

Average female lice per fish

Source

Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Production cycle end date: Feb 2019
Total losses: 29.7 %

Production cycle end date: Oct 2020
Total losses: 30.3 %

Production cycle end date: Jan 2023
Total losses: 9.4 %

Source

Fish Health Inspectorate mortality

Date:
20/06/22-26/06/22
Mortality:
9,660
Mortality Rate:
1.76%
Reason given: Treatment Loss (Freshwater in wellboat)
Treatment Loss (Freshwater in wellboat)
First week report. Post treatment. Following week (Mon&Tues only) 0.71% so far. FHI to monitor.
Date:
27/06/22-03/07/22
Mortality:
6,078
Mortality Rate:
1.22%
Reason given: Predator
Predator
Business correspondent contacted for further info. Post treatment moribunds are being targeted by seals. Mortalities seem to be decreasing. FHI to mornitor.
Date:
04/07/22-10/07/22
Mortality:
15,280
Mortality Rate:
2.63%
Reason given: CMS/ Gill Infections
CMS/ Gill Infections
Business correspondent contacted. Harvesting has commenced and most affected pens are being targeted over the next 3 weeks. CMS and AGD confirmed on site. FHI to consider inspection in w/b 25/07/2022.
Date:
11/07/22-17/07/22
Mortality:
19,127
Mortality Rate:
3.09%
Reason given: Gill infections
Gill infections
Stocks due to be harvested out w/e 7th August
The stocks that have been affected are being harvested out by the 7th August. Unaffected stock will remain on the site. FHI to monitor.
Date:
18/07/22-24/07/22
Mortality:
10,912
Mortality Rate:
1.82%
Reason given: Gill infections
Gill infections
Affected populations being harvested out by 5th August
Site inspected 26/07/2022. Diagnostic samples taken.
Date:
26/09/22-02/10/22
Mortality:
2,978
Mortality Rate:
1.25%
Reason given: Predator - Seal
Predator - Seal
First report this cycle for the Q4 fish. FHI to monitor.
Date:
03/10/22-09/10/22
Mortality:
5,145
Mortality Rate:
2.19%
Reason given: Predator - Seal
Predator - Seal
FHI visited 26/7/22 and conducted a diagnostic investigation. Salmon gill poxvirus, SAV, IPN, ERM CMS, Paranucleospora and AGD positive.
Date:
10/10/22-16/10/22
Mortality:
4,766
Mortality Rate:
2.07%
Reason given: Predator
Predator
Historic event - NFA
Date:
24/10/22-30/10/22
Mortality:
1,361
Mortality Rate:
1.15%
Reason given: Pasteurella
Pasteurella
Site inspected 26/07/22. Currently increasing harvesting. FHI to monitor.
Date:
31/10/22-06/11/22
Mortality:
1,304
Mortality Rate:
1.36%
Reason given: Pasteurella
Pasteurella
Site inspected 26/07/22. Currently increasing harvesting. FHI to monitor.
Date:
07/11/22-13/11/22
Mortality:
1,013
Mortality Rate:
1.07%
Reason given: Pasteurella / Seal predation
Pasteurella / Seal predation
Site harvesting out
Business correspondent contacted. Increasing harvest on site. FHI to monitor.
Date:
21/11/22-27/11/22
Mortality:
3,801
Mortality Rate:
8.52%
Reason given: Predator
Predator
Mortality figures for wk48 indicate mortality is currently decreasing. FHI to monitor. Business correspondant contacted for more information and will update in due course.
Date:
28/11/22-04/12/22
Mortality:
940
Mortality Rate:
2.30%
Reason given: Pasteurella / Predator
Pasteurella / Predator
Mortality figures for wk49 indicate mortality is currently decreasing. FHI to monitor.
Date:
05/12/22-11/12/22
Mortality:
606
Mortality Rate:
1.52%
Reason given: Pasteurella
Pasteurella
Harvesting ongoing. FHI to monitor.
Date:
12/12/22-18/12/22
Mortality:
558
Mortality Rate:
1.42%
Reason given: Pasteurella
Pasteurella
Harvesting ongoing. FHI to monitor.
Date:
19/12/22-25/12/22
Mortality:
895
Mortality Rate:
2.31%
Reason given: Pasteurella
Pasteurella
Site fallow, no further action.
Date:
26/12/22-01/01/23
Mortality:
790
Mortality Rate:
7.91%
Reason given: Pasteurella
Pasteurella
Site fallow, no further action.
Date:
02/10/23-08/10/23
Mortality:
17,625
Mortality Rate:
1.94%
Reason given: AGD
AGD
AGD treatment planend for this weekend
First report of cycle, FHI to monitor post treatment.
Date:
09/10/23-15/10/23
Mortality:
32,901
Mortality Rate:
3.7%
Reason given: AGD
AGD
2nd report this cycle. Increase on previous week. FHI to monitor
Date:
16/10/23-22/10/23
Mortality:
40,777
Mortality Rate:
4.76%
Reason given: AGD
AGD
3rd report this cycle. Increase on previous 2 weeks. Inspection scheduled
Date:
23/10/23-29/10/23
Mortality:
14,795
Mortality Rate:
1.81%
Reason given: AGD
AGD
Large reduction from previous weeks mortlity rate, Inspection has been scheduled FHI to monitor.
Date:
30/10/23-05/11/23
Mortality:
15,330
Mortality Rate:
1.69%
Reason given: AGD
AGD
FW treating currently underway.
FHI visit scheduled.
Date:
06/11/23-12/11/23
Mortality:
28,688
Mortality Rate:
3.22%
Reason given: AGD
AGD
FW treating currently underway.
FHI visited site w/b 13/11. Diagnositc samples taken, awaiting results.
Date:
13/11/23-19/11/23
Mortality:
13,329
Mortality Rate:
1.54%
Reason given: AGD/bacterial
AGD/bacterial
FHI visited site w/b 13/11. Diagnositc samples taken, awaiting results.
Date:
20/11/23-26/11/23
Mortality:
12,018
Mortality Rate:
1.41%
Reason given: Bacterial
Bacterial
Site inspected 14/11 (2023-0518). Diagnostic samples taken. AGD, Salmon gill poxvirus and Paranucleospora theridion identified. FHI to monitor.
Date:
27/11/23-03/12/23
Mortality:
9,091
Mortality Rate:
1.08%
Reason given: Bacterial
Bacterial
Site inspected 14/11 (2023-0518). Diagnostic samples taken. AGD, Salmon gill poxvirus and Paranucleospora theridion identified. FHI to monitor.

Source

Inspection reports

Case Number: 2021-0311


Download Site disposes morts at whiteshore cockles.
4 pens are being transferred to West Loch Tarbert in the next couple of weeks. Reason is due to previous problems with disease at West Loch Tarbert. Smolts failed often there due to temperature fluctuations. Growing them to a specific size at
Groatay and then transferring to West Loch Tarbert.
Cleanerfish are planned to come on site in first week of November after pens have been thinned down (6%-10% lumpfish)
Stock on site is from Loch Arkaig and Glenfinnan.
Remote inspection conducted by , supervised by on 01/10/2021.
Site inspection conducted by and supervised by 05/10/2021.
Samples taken for VMD on 05/10/2021 by and supervised by [Original PDF]

Case Number: 2022-0280


Download Physical site inspection and paper work conducted by , observed by .
Sampling conducted by & , F1 and F2 by and F3 by .
The site was visited in response to sustained elevated levels of mortality above the reporting criteria. CMS and AGD confirmed onsite.
11 cages currently stocked, 6 pens of ex Stulaigh stock and 5 pens of ex Grey Horse Channel Outer Stofnfiskur stock.
Visibility on the date of inspection was good, fish were observed feeding deep. Numbers of lethargic and moribund fish were observed in pens 33, 31 and 30, 3 fish were sampled for a diagnostic.
The site recently treated with freshwater on 08/07/2022.
Multiple sightings of seals near the cages during the inspection on site at Groatay. Nylon nets currently in use, the site have plans in place to put in seal pro nets. Seal colony nearby. Site is experiencing seal predation.
During physical inspection of the site, a loose bullet casing was found on the walkway of pen 32. The casing was removed from the site and passed onto Marine Scotland Compliance. [Original PDF]

Case Number: 2023-0518


Download Salmon peaks in mortalities 2022, wk 39 2,978 (1.25%), wk 40 5,145 (2.19%), wk 41 4,766 (2.07%), wk 43 1,361 (1.15%), wk
44 1,304 (1.36%), wk 45 1,013 (1.07%), wk 47 3,801 (8.52%), Mainly seal predation and pasteurella but some poor doers,
CMS and gill health.
Salmon peaks in mortality 2023, wk 39 13,475 (1.46%), wk 40 17,625 (1.94%), wk 41 32,901 (3.70%), wk 42 40,777 (4.76%), wk 43 14,795 (1.81%), wk 44 15,330 (1.69%), AGD the main issue some poor doers in wk 39 also.
Lumpfish peaks in mortality 2023 wk 28 10,280 (8.15%), wk 29 21,970 (18.97%), wk 30 3,913 (4.17%), mainly tenacibaculum.
Wrasse peaks in mortality 2023, wk 39 494 (2.11%), wk 41 687 (3.05%), transport losses and without diagnosis.
Wrasse mortalities last four weeks, wk 44 146 (0.66%) wk 43 297 (1.29%), wk 42 456 (1.95%), wk 41 687 (3.05%).
Lumpfish mortalities last four weeks, wk 44 104 (0.12%), wk 43 111 (0.13%), wk 42 391 (0.46%), wk 41 161 (0.19%).
Paramove 50 was administered in mid August, September and October and freshwater in September and November to treat
AGD.
Pisckiricketsia recently identified, anti-biotic to be administered.
A number of moribunds observed in all cages inspected. [Original PDF]

Case Number: 2024-0155


Download Organic production at site.
Main causes of salmon mortalities on site at the moment are poor performers and seal predation. Mortalities due to AGD have reduced significantly since late 2023/early 2024. Main cause of mortality in lumpfish is Tenacibaculum.
Freshwater treatments (4 hour) throughout January to April on specific pens as treatment for AGD. Plan precautionary freshwater treatment for AGD in June. Hydrogen peroxide treatment on 2 pens in December. Site also stocked with lumpfish from Ocean Matters and wild caught wrasse.
Monitor for plankton and jellyfish, but have stayed below trigger levels for placing fish on starve. Small jellyfish (<1cm diameter) seen in and around pens during inspection.
Fish split down to Grey Horse Channel and Grey Horse Channel Outer during this cycle.
A few poor performers seen in pens with small grade and a couple of lethargic salmon were caught and removed. One had an extremely distended abdomen and the other several small lesions along abdomen. One feeding, healthy fish also removed for
VMD sample. All three included in diagnostic sample. [Original PDF]

Source