Site Details: Maragay Mor
Grimsay
North Uist
HS6 5HY
Water type: Seawater
Cumulative mortality over full production cycle
Production cycle end date: Oct 2019
Total losses: 27.1 %
Production cycle end date: Oct 2021
Total losses: 29.5 %
Production cycle end date: Aug 2023
Total losses: 33.5 %
Fish Health Inspectorate mortality
31/10/22-06/11/22
7,829
1.32%
07/11/22-13/11/22
6,280
1.07%
14/11/22-20/11/22
18,598
3.20%
21/11/22-27/11/22
9,471
1.68%
29/05/23-04/06/23
7,396
1.46%
05/06/23-11/06/23
9,319
1.88%
12/06/23-18/06/23
5,632
1.16%
03/07/23-09/07/23
5,027
1.74%
10/07/23-17/07/23
7,073
2.49%
17/07/23-23/07/23
2,824
1.02%
24/07/23-30/07/23
3,426
1.70%
31/07/23-06/08/23
5,604
2.94%
07/08/23-13/08/23
21,524
12.58%
14/08/23-20/08/23
13,609
12.80%
21/08/23-27/08/23
5,921
7.07%
Inspection reports
Case Number: 2022-0162
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Remote inspection carried out 19/05/2022.
The site experiences a challenge with Caligus during the summer, managed with Slice at input and freshwater treatments are now also available since last summer. Adult female counts are currently 0 but the site has been above 2 in previous cycles - this data was shared with the FHI at the time.
During the site inspection no moribund or dead fish were observed, with the main population of fish in the pens looking healthy and with a good feeding response. The fish sampled for the VMD also looked healthy internally and externally, with very low numbers of Caligus observed. The site is currently treating with Slice to address this issue. [Original PDF]
Case Number: 2024-0189
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Came onto site with frunculosis from the hatchery.
Health report - 21/05/2024 - Frunculosis is in the background at lower levels (considered inactive)
Mortality: Peaks - 2022 - Week 46 3.2% (18,598) due to freshwater treatment, 2023 - Weeks 32 and 33 12.58% and 12.80% just before harvesting due to CMS. New cycle mortality has been low since input - apart from initial input losses.
Treatments: Last cycle freshwater treatments and FLS treatment. This cycle - SLICE 25th April - 2nd May 2024. Syncaine
(active ingredient Tricaine methanesulfonate) for health treatments but going back to using Tricaine once they have used up the supply of Syncaine until fish are 2.5kg. When fish are above 2.5kg the site will then use Optomease.
Lice: Highest this cycle has been 0.05 and last cycle 0.73 adult females. Lice levels this cycle have been 0.01 or below.
During physical inspection of the site no mortality was seen. Fish were observed shoaling and had good feed responses.
Fish for VMD samples were taken from pens 7 and 9 - all fish were clear of lice and appeared healthy both externally and internally. [Original PDF]