Site Details: Trilleachan Mor

The Old Ruin
Maaruig
HS3 3AG
Operator: Mowi Scotland Ltd
Water type: Seawater

Average female lice per fish

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Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Production cycle end date: Apr 2018
Total losses: 7.5 %

Production cycle end date: Nov 2020
Total losses: 28.9 %

Production cycle end date: Sep 2022
Total losses: 2.6 %

Source

Fish Health Inspectorate mortality

Date:
01/08/22-07/08/22
Mortality:
4,058
Mortality Rate:
2.38%
Reason given: Treatment mortality (Thermolicer) / CMS
Treatment mortality (Thermolicer) / CMS
week 8/8/22 Mon to Thurs 1.06%
First report this cycle. FHI to monitor.
Date:
08/08/22-14/08/22
Mortality:
3,402
Mortality Rate:
2.04%
Reason given: CMS
CMS
week15/8/22 Mon to Wed 1.05%
2nd report this cycle. Morts down slightly from last week, FHI to monitor.
Date:
15/08/22-21/08/22
Mortality:
3,635
Mortality Rate:
2.22%
Reason given: CMS
CMS
Mortality rate has increased in following week to 3.52%.
Harvesting ongoing, site due to be fallow by 8th Sept.
Date:
22/08/22-28/08/22
Mortality:
4,428
Mortality Rate:
3.52%
Reason given: CMS
CMS
Mortality is currently 1.42% for the week commencing 29/08/2022.
Harvesting ongoing, site due to be fallow by 8th Sept.
Date:
29/08/22-04/09/22
Mortality:
3,980
Mortality Rate:
3.28%
Reason given: CMS
CMS
Site planned to be fallowed by 10th September
Site due to fallow 10/9/22
Date:
25/09/23-01/10/23
Mortality:
9,850
Mortality Rate:
4.23%
Reason given: Treatment loss
Treatment loss
First report this cycle. FHI to monitor
Date:
16/10/23-22/10/23
Mortality:
9,687
Mortality Rate:
1.67%
Reason given: AGD/'Treatment losses
AGD/'Treatment losses
2nd report this cycle. FHI to monitor.
Date:
23/10/23-29/10/23
Mortality:
7,888
Mortality Rate:
1.39%
Reason given: AGD/Treatment losses
AGD/Treatment losses
Mortality rate has decreased from previous weeks, FHI to monitor.
Date:
30/10/23-05/11/23
Mortality:
9,870
Mortality Rate:
1.76%
Reason given: AGD/Treatment losses/PGD
AGD/Treatment losses/PGD
FW treatments planned to start on Sunday
FHI to monitor
Date:
06/11/23-12/11/23
Mortality:
54,755
Mortality Rate:
9.93%
Reason given: AGD/treatment loss/PGD
AGD/treatment loss/PGD
FW treatments planned to start on Sunday
FHI visit scheduled w/b 20/11.
Date:
13/11/23-19/11/23
Mortality:
77,987
Mortality Rate:
15.70%
Reason given: AGD treatment loss/bacterial
AGD treatment loss/bacterial
Site visited wb 20/11/2023 and DIA taken. Awaiting results. FHI to monitor
Date:
20/11/23-26/11/23
Mortality:
41,386
Mortality Rate:
11.56%
Reason given: Treatment loss/bacterial
Treatment loss/bacterial
Site inspected 21/11 (2023-0530). AGD, Salmon gill poxvirus and Paranucleospora theridion identified. Awaiting bacteriology results. FHI to monitor.
Date:
27/11/23-03/12/23
Mortality:
14,700
Mortality Rate:
4.64%
Reason given: Treatment loss/bacterial
Treatment loss/bacterial
Site inspected 21/11 (2023-0530). AGD, Salmon gill poxvirus and Paranucleospora theridion identified. Awaiting bacteriology results. FHI to monitor.
Date:
04/12/23-10/12/23
Mortality:
11,175
Mortality Rate:
6.25%
Reason given: Treatment loss/bacterial
Treatment loss/bacterial
FHI visited 27/11/23, case number 2023-0530. Diagnostic samples collected, report outstanding. Email from health manager received 23/12, fish health challenging due to AGD, piscirickettsia and pasteurella and increasing sea lice pressure. All fish have been treated with antibiotics and FW. Reported that health is improving following treatments and reducing temperatures.
Date:
11/12/23-17/12/23
Mortality:
13,539
Mortality Rate:
8.08%
Reason given: Treatment loss/bacterial
Treatment loss/bacterial
FHI visited 27/11/23, case number 2023-0530. Diagnostic samples collected, report outstanding. Email from health manager received 23/12, fish health challenging due to AGD, piscirickettsia and pasteurella and increasing sea lice pressure. All fish have been treated with antibiotics and FW. Reported that health is improving following treatments and reducing temperatures.
Date:
18/12/23-24/12/23
Mortality:
2,197
Mortality Rate:
1.63%
Reason given: Bacterial
Bacterial
FHI visited 27/11/23, case number 2023-0530 and diagnostic samples taken. Mortality rate has reduced to a around a quarter of the previous week.
Date:
19/02/24-25/02/24
Mortality:
2,115
Mortality Rate:
1.15%
Reason given: Treatment Loss (Thermolicer)
Treatment Loss (Thermolicer)
FHI visited 07/02/24, case number 2024-0024, diagnsotic samples collected. Results pending. FHI to monitor.

Source

Inspection reports

Case Number: 2020-0150


Download 55000 fish came from mowis seaforth site, October @1kg
Mechanical treatment started on 18th of February- Sea lice levels required treatment. Fish were dying in the crowd and post treatment with Hydrolicer. Site got good clearance of lice on the fish but sustained heavy mortality post treatment.
Cages 1, 3 and 6 were worst affected.
Mortality has dropped back down to normal levels.
CMS confirmed on site - had been detected at low levels up until week 6, then started to see it at higher levels. Mortality has dropped back down and CMS is at low levels. Site is being monitored closely and target harvesting could be used if mortality becomes an issue.
Mortality last 4 weeks.
Week 14 - 777 fish and 0.16%
Week 13 - 3186 - 0.66% week 12 - 4136 - 0.86% week 11 - 14529 - 2.92%
Little bit of mortality as result of freshwater, but most attributed to CMS, company biologists conducted diagnostics and found clinical signs of CMS as well as confirmation via PCR
Due to Covid-19 outbreak a passive surveillance inspection was conducted remotely instead of a site visit. [Original PDF]

Case Number: 2022-0173


Download Records only available from wk 14 2022 as this is the first cycle of fish to be grown at the site since it was taken over by Mowi.
Some assessments on SLI is based on submissions made by TSSC to FHI.
Stock on site a thin down from Seaforth, historic AGD on site.
Seven day treatment of Slice administered on the 24th April to the 30th April, site records indicate withdrawal but standard treatment.
A high number of lethargic/moribund fish evident in all cages, some lice grazing damage and evidence of net abrasion noted.
These fish were all high in the pens and the general population appeared in reasonable condition although they were deep in the water column. Advised that focus on moribund removal should be prioritised.
Five fish were removed for diagnostic sampling. [Original PDF]

Case Number: 2023-0530


Download Site inspected in response to rapid increased mortality. Week 45 (54,755, 9.93%) and Week 46 (77,987, 15.7%) attributed to a combination of issues including AGD, PGD, treatment losses and bacterial infection.
Due to time constraints imposed by poor weather on the date of inspection, only 2 pens were inspected for clinical signs of disease. 5 fish were removed for diagnostic sampling from the two pens inspected, sampling was conducted in a rough sea state in wet and windy weather on the floor of the sites voe boat.
From inspection of the stock, approximately 50 fish in each pen were observed as moribund and lethargic. A healthy population of fish was observed shoaling in each pen.
The most recent results reported from the site company vet was on 21/11/2023 which showed positives for PRV, P.Skyensis,
Piscirickettsia, Yersinia and Tenacibaculum.
Site planning to treat Aquatet (Oxtetracycline) antibiotics, 10 - 14 day treatment started Friday 24th.
Slice treatment 16/11/2023, Tricaine, 14/11/2023 Freshwater FLS, 3 hour treatments.
Cleanerfish mortality (Wrasse) - Wk 47 (217, 1.03%), Wk 46 (36, 0.17%), Wk 45 (70, 0.33%), Wk 44 (98, 0.46%).
Cleanerfish mortality (Lumpfish) - Wk47 (615, 0.73%), Wk46 (138, 0.16%), Wk45 (1,144, 1.33%), Wk 44 (525, 0.61%) [Original PDF]

Case Number: 2024-0024


Download Site inspected during a spell of heavy snow fall, sea state was calm.
A strong healthy population of fish were observed in each stocked facility, shoaling well. Approximately 10 - 20 moribund were observed in each pen. The site are currently clearing moribund following a prolonged spell of increased mortality earlier this production cycle. Of the moribunds observed, lesions to the flanks and heads were present. Lice levels appeared low.
This production cycle of fish at Trilleachan Mor sustained a severe and prolonged spell of mortality In October and November of 2023. Mortality on site was attributed to a range of factors including environmental damage, AGD, bacterial infection and treatment loss. Mortality on site in December and January has significantly improved and the site has seen a great feeding response from the fish.
The most recent company fish health visit reported some signology suggestive of moritella and CMS.
3 fish were removed for diagnostic sampling, the site was previously inspected and diagnostic samples taken on 21/11/2023.
Fish sampled for VMD appeared health both internally and externally.
Cleanerfish mortality : Lumpfish - Week 5 (373, 0.4%), Week 4 (72, 0.09%), Week 3 (253, 0.33%), Week 2 (596, 0.77%).
Cleanerfish mortality : Wrasse - Week 5 (243, 1.26%), Week 4 (38, 0.2%), Week 3 (147, 0.75%), Week 2 (190, 0.97%). [Original PDF]

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