Site Details: Scotasay
Scalpay
Isle of Harris
HS4 3YD
Water type: Seawater
Cumulative mortality over full production cycle
Production cycle end date: Mar 2019
Total losses: 28.1 %
Production cycle end date: Feb 2023
Total losses: 28.2 %
Production cycle end date: Jun 2024
Total losses: 17.7 %
Fish Health Inspectorate mortality
14/04/22-20/03/22
7,652
1.36%
27/06/22-03/07/22
6,841
1.29%
04/07/22-10/07/22
7,427
1.41%
11/07/22-17/07/22
11,019
2.13%
18/07/22-24/07/22
9,155
1.81%
25/07/22-31/07/22
26,858
5.41%
01/08/22-07/08/22
29,022
6.18%
08/08/22-14/08/22
26,251
5.97%
15/08/22-21/08/22
14,021
3.39%
22/08/22-28/08/22
8,173
2.05%
29/08/22-04/09/22
6,832
1.75%
05/09/22-11/09/22
6,797
1.77%
12/09/22-18/09/22
7,385
1.96%
19/09/22-25/09/22
7,039
1.91%
26/09/22-02/10/22
27,506
7.64%
03/10/22-09/10/22
5,158
1.55%
31/10/22-06/11/22
5,859
1.44%
07/11/22-13/11/22
9,047
2.26%
14/11/22-20/11/22
4,845
1.24%
21/11/22-27/11/22
4,132
1.30%
28/11/22-04/12/22
6,426
2.77%
05/12/22-11/12/22
2,495
1.65%
12/12/22-18/12/22
1,334
1.43%
02/01/23-08/01/23
823
1.58%
09/01/23-15/01/23
1,057
2.06%
16/01/23-22/01/23
561
1.12%
23/01/23-29/01/23
642
1.29%
30/01/23-05/02/23
1,014
2.07%
06/02/23-12/02/23
820
1.71%
13/02/23-19/02/23
732
1.56%
25/03/24-31/03/24
6,578
1.21%
08/04/24-14/04/24
6,142
1.21%
13/05/24-19/05/24
4,663
1.44%
20/05/24-26/05/24
4,422
1.55%
27/05/24-02/06/24
4,970
1.99%
03/06/24-09/06/24
3,085
1.42%
17/06/24-23/06/24
655
1.08%
Inspection reports
Case Number: 2021-0563
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Stock: Geocrab and Heb Smolt (Mingarry Hatchery)
Management transferred from Mowi to TSSC in 2021. Fish input was on 13/10/2021.
Visibility of the fish was poor, due to the fish feeding deeply. Fish sampled for VMD were healthy and in good condition.
Recent Treatment:
Slice: 23/11 - 29/11/2021
Remote inspection conducted by supervised by on 01/12/2021.
Site inspection conducted by , and supervised by on 08/12/2021. VMD samples taken by and supervised by
on 08/12/2021. [Original PDF]
Case Number: 2022-0456
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Mortality events commenced from wk 26 2022. Gill health issues were attributed to cause of mortality on site, with PGD being main issue following increased plankton episode. Aeration increased to manage plankton burden as well as reduction in handling.
Slight anaemia also observed on site. Mechanical treatments planned were cancelled due to the fish not tolerating mechanical treatment. FW treatments commenced in WK 31 to aid gill issues experienced on site. From health screening, initial results were positive for AGD, Brachiomonas cysticola and paranucleospora theridion. Functional feed scheduled for Wk32. mortalities remained high and constant following second round of FW treatments in Wk36.
Mortality events 2022 (all attributed to gill health and bacterial disease as described in recent disease problems):
Wk37, 7385, 1.96%
WK36, 6797,1.77%
Wk35, 6832, 1.75%
Wk34, 8137, 2.05%
Wk33, 14021, 3.30%
Wk32, 26251, 5.97%
Wk31, 29022, 6.18%
Wk30, 26868, 5.41%
Wk29, 9155, 1.81%
Wk28, 11019, 2.13%
Wk27, 7427, 1.41%
Wk26, 6841, 1.29%
Five fish were removed during the site inspection for diagnostic sampling purposes. All fish were observed to have liver colours of 2/3 as well as no food and yellow pseudofaeces present on examination. In addition, some hearts were observed to be pale and slightly enlarged. Pen two and three were observed to have an increased amount of moribund and lethargic fish on inspection. During site inspection, pen 8 was being treated with freshwater with a new wellboat- Ronja Star - as lice were increasing on site.
Cleanerfish mortality (wrasse and lumpfish) 2022:
Wk18, 8405, 14.80% (FW treatment)
Wk19, 17029, 35.18% (black losses)
WK23, 4990,16.56% (black losses)
Wk24, 4687, 18.65 (black losses) [Original PDF]
Case Number: 2022-0456
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Mortality events commenced from wk 26 2022. Gill health issues were attributed to cause of mortality on site, with PGD being main issue following increased plankton episode. Aeration increased to manage plankton burden as well as reduction in handling.
Slight anaemia also observed on site. Mechanical treatments planned were cancelled due to the fish not tolerating mechanical treatment. FW treatments commenced in WK 31 to aid gill issues experienced on site. From health screening, initial results were positive for AGD, Brachiomonas cysticola and paranucleospora theridion. Functional feed scheduled for Wk32. mortalities remained high and constant following second round of FW treatments in Wk36.
Mortality events 2022 (all attributed to gill health and bacterial disease as described in recent disease problems):
Wk37, 7385, 1.96%
WK36, 6797,1.77%
Wk35, 6832, 1.75%
Wk34, 8137, 2.05%
Wk33, 14021, 3.30%
Wk32, 26251, 5.97%
Wk31, 29022, 6.18%
Wk30, 26868, 5.41%
Wk29, 9155, 1.81%
Wk28, 11019, 2.13%
Wk27, 7427, 1.41%
Wk26, 6841, 1.29%
Five fish were removed during the site inspection for diagnostic sampling purposes. All fish were observed to have liver colours of 2/3 as well as no food and yellow pseudofaeces present on examination. In addition, some hearts were observed to be pale and slightly enlarged. Pen two and three were observed to have an increased amount of moribund and lethargic fish on inspection. During site inspection, pen 8 was being treated with freshwater with a new wellboat- Ronja Star - as lice were increasing on site.
Cleanerfish mortality (wrasse and lumpfish) 2022:
Wk18, 8405, 14.80% (FW treatment)
Wk19, 17029, 35.18% (black losses)
WK23, 4990,16.56% (black losses)
Wk24, 4687, 18.65 (black losses) [Original PDF]
Case Number: 2023-0449
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Scotasay is currently stocked with fish from Applecross, Barcaldine and Landcatch. So far, they have had a good start to the cycle, mortality on site has remained low since input. In mid August of this year the site experienced a bloom of micro jellyfish which has lead to some environmental damage to the gills. Pens 6 and 8 were worst affected and are displaying some elevated scores for PGD. The site treated with freshwater on 27/08/2023 (Ronja Star) and again on 18/09/23 (Ronja Fisk) which has had a successful impact on treating the gills. Sea lice infestations have remained below the treatment threshold for the duration of this cycle thus far, the site conducted a precautionary SLICE treatment from 28//08/23 - 04/09/23.
The site has been continually stocking with wild caught ballan wrasse between 16/09/23 - 22/09/23. Two cleanerfish mortality events were observed occurring during the inspection of the sites records for this production cycle. These mortality events occurred during the two freshwater treatments the site has conducted this cycle, the first being on 27/08/23, 1766 (26.07%) and 3,521 (49.63%). For 24 hours prior to each FW treatment the site deployed 3 - 4 baited creels into each stocked pen in attempt to remove cleanerfish prior to treatment. The site also tried to separate the salmon stock from the cleaner fish stock using the well boats however this proved difficult due to the wrasse being of similar size to the salmon stocks.
Upon the physical inspection of the stock, fish were observed shoaling well and responding positively to routine feeding regimes. No clinical signs of disease were observed during the inspection of the stocks.
Fish removed for VMD sampling appeared healthy, with no gross pathology observed.
Cleanerfish : Week 39 (32, 0.90%), Week 38 (3,521, 49.63%), Week 37 (21, 0.35%), Week 36 (80, 1.31%). [Original PDF]
Case Number: 2024-0156
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IDN placed on site as it is within 1 tidal excursion of site confirmed with clinical BKD- Seaforth
Site visit arranged [Original PDF]
Case Number: 2024-0165
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Wrasse - wild caught
Pen 6,7, 8 initally stocked at the start of cycle with wrasse but due to harvests and FW treatments no wrasse remain on site.
No wrasse were seen during site inspection. livehaul harvests
Stock origins of fish on site: stofinfiskur- scottish sea farms (barcaldine) stofinfiskur - applecross native hebs - landcatch (ormsary)
Increased Mortality 2024:
Wk13 - 1.21%, 6578 wk15 - 1.21%, 6142
Wrasse mortality:
2023, Wk52, 1096, 44.4% (post treatment, freshwater/FLS)
2024, Wk1, 893, 65.09% (post treatment, freshwater/FLS)
Treatment- last Slice treatment conducted 13/12/2023 - fish no longer in withdrawal
A statutory inspection was conducted following the confirmation of clinical BKD at a site within the 1 tidal excursion from
Scotasay. An initial designation notice was placed on the site, and therefore this inspection aimed to determine whether clinicals signs for BKD can be observed.
During the site inspection, all stocked pens were inspected with pen 8 and 2 noted as pens with elevated mortality compared to the rest of the site. Targeted harvests were planned for 28/05/2024 and 29/05/2024, with plans to empty pen 1 on
28/05/2024 and destock pen 8 from 29/05/2024 onwards, following submission of movement request on 28/05/2024. ~4-6 lethargic and moribund fish were observed per pen, and upon removal and inspection no clinical signs of BKD were observed.
Due to furunculosis being highlighted as an health issue on site, and lesions were seen in some of the fish, two fish were sampled for diagnostic purposes. [Original PDF]