Site Details: Easter Score Holms

Gremista
Lerwick
ZE1 0PX
Operator: Scottish Sea Farms Ltd
Water type: Seawater

Average female lice per fish

Source

Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Production cycle end date: Jul 2019
Total losses: 29.5 %

Production cycle end date: Jul 2021
Total losses: 10 %

Production cycle end date: Sep 2023
Total losses: 57.6 %

Source

Fish Health Inspectorate mortality

Date:
28/11/22-04/12/22
Mortality:
55,944
Mortality Rate:
6.80%
Reason given: Gill Health Related
Gill Health Related
CGD; AGD FW wellboat treatment scheduled
To look at possibility of Shetland trip to visit. FHI to monitor.

Date:
05/12/22-11/12/22
Mortality:
58,269
Mortality Rate:
7.70%
Reason given: Gill Health Related
Gill Health Related
CGD; AGD; high mortality in one pen during FW wellboat treatment, reverted to paramove tarp treatments with lower mortality for other pens.
Mortality remains high. Weather and airport strikes preventing vist. FHI to monitor and visit early 2023 if issues continue. PSI conducted 20/12/22.

Date:
19/12/22-25/12/22
Mortality:
12,404
Mortality Rate:
1.80%
Reason given: Gill Health Related
Gill Health Related
CGD; AGD; post FW wellboat treatment
Site contacted for further information. Source of gill issues is thought to have been from a jelly fish bloom which occured late last year. The site are planning to thin out stock in the worst affected cage and start treating the site with peroxide in week 2. FHI to monitor.

Date:
26/12/22-01/01/23
Mortality:
13,470
Mortality Rate:
2.00%
Reason given: Gill Health Related
Gill Health Related
CGD; AGD; post FW wellboat treatment
Site contacted for further information. Source of gill issues is thought to have been from a jelly fish bloom which occured late last year. The site are planning to thin out stock in the worst affected cage and start treating the site with peroxide from the start of next week. FHI to monitor.

Date:
02/01/23-08/01/23
Mortality:
26,320
Mortality Rate:
3.90%
Reason given: Gill Health Related
Gill Health Related
CGD; AGD treatment scheduled
Business correspondent contacted for further information. Peroxide treatment in tarps scheduled from next week Wk 3. One pen has removed from site through harvest. Site situation reviewed week by week. FHI to monitor and potential for site to be visited in w/b 30/01/2023.

Date:
09/01/23-15/01/23
Mortality:
43,880
Mortality Rate:
6.80%
Reason given: Gill health related
Gill health related
CGD, AGD treatment scheduled
On-going mortality event. FHI planned visit w/b 23/1/23. FHI to monitor in meantime.

Date:
16/01/23-22/01/23
Mortality:
14,300
Mortality Rate:
2.40%
Reason given: Gill Health Related
Gill Health Related
CGD; Secondary bacterial; FW wellboat treatment scheduled
Site inspected 25/01/23. Diagnostic samples taken. FHI to monitor

Date:
23/01/23-29/01/23
Mortality:
15,672
Mortality Rate:
2.80%
Reason given: Gill Health Related
Gill Health Related
CGD; Secondary bacterial; FW wellboat treatment scheduled, CMS
Site inspected 25/01/23. Diagnostic samples taken. Site are planning to harvest the worst affected cage. FHI to monitor

Date:
30/01/23-05/02/23
Mortality:
13,432
Mortality Rate:
2.50%
Reason given: Gill Health Related
Gill Health Related
CGD; FW wellboat treatment scheduled
Mortality has slightly reduced from previous week. Diagnostic samples taken 25/01/2023. Business correspondent contacted for planned treatment dates. FHI to monitor.

Date:
06/02/23-12/02/23
Mortality:
5,634
Mortality Rate:
1.10%
Reason given: Gill Health Related; Bacterial disease
Gill Health Related; Bacterial disease
CGD; Secondary bacterial; Tarp AGD treatments & FW wellboat treatment scheduled
Mortality decreasing from previous week. Diagnostic samples taken 25/01/2023. FHI to monitor.

Date:
13/02/23-19/02/23
Mortality:
13,057
Mortality Rate:
2.50%
Reason given: Gill Health Related; Bacterial disease
Gill Health Related; Bacterial disease
CGD; Secondary bacterial; Tarp AGD treatments & FW wellboat treatment underway
Diagnostic samples taken 25/01/2023. Business correspondent contacted. Destocking through harvest. FHI to monitor.

Date:
20/02/23-26/02/23
Mortality:
17,705
Mortality Rate:
3.50%
Reason given: Gill Health Related; Virus disease; Bacterial disease
Gill Health Related; Virus disease; Bacterial disease
CGD; CMS; Secondary bacterial; destocking through harvest
Diagnostic samples taken 25/01/2023. FHI to monitor.

Date:
27/02/23-05/03/23
Mortality:
20,465
Mortality Rate:
4.20%
Reason given: Gill Health Related; Virus disease; Bacterial disease
Gill Health Related; Virus disease; Bacterial disease
CGD; CMS; Secondary bacterial; FW wellboat treatment scheduled
Diagnostic samples taken 25/01/2023; CMS, CGD, Moritella viscosa. Business contacted for further detail on bacteria detailed as reason.Update 15/3/23 Moritella.

Date:
06/03/23-12/03/23
Mortality:
19,250
Mortality Rate:
4.10%
Reason given: Gill Health Related; Virus disease; Bacterial disease
Gill Health Related; Virus disease; Bacterial disease
FW wellboat treatment completed, and destocked through harvest of affected pens.
Diagnostic samples taken 25/01/2023; CMS, CGD, Moritella viscosa. FHI to monitor

Date:
13/03/23-19/03/23
Mortality:
18,757
Mortality Rate:
4.50%
Reason given: Gill Health Related; Virus disease; Bacterial disease
Gill Health Related; Virus disease; Bacterial disease
Post FW wellboat treatment.
Diagnostic samples taken, 20230009 - AGD, CGD, CMS, Moritella viscosa identified. FHI to monitor.

Date:
20/03/23-26/03/23
Mortality:
13,205
Mortality Rate:
3.40%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD, CMS, increased FH surveilance
Site inspected 25/01/23, diagnostic samples taken, 20230009 - AGD, CGD, CMS, Moritella viscosa identified. Mortalities reducing from previous week. FHI to monitor.

Date:
27/03/23-02/04/23
Mortality:
14,064
Mortality Rate:
3.7%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD, CMS, destocking through harvest
Site contacted for further information. FHI to monitor.

Date:
03/04/23-09/04/23
Mortality:
21,657
Mortality Rate:
6.10%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD, CMS, destocking through harvest
Site contacted for further information, FHI to monitor.

Date:
10/04/23-16/04/23
Mortality:
14,186
Mortality Rate:
4.3%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD, CMS, destocking through harvest
Site correspondent contacted for further information. Mortality has reduced from previous week. From eleven pens, four pens are currently still on the harvest plan and three have already harvested out. CGD and CMS main issues. Site was inspected and diagnostic samples taken 25/01/2023 with Moritella, CMS and CGD identified. FHI to monitor.

Date:
17/04/23-23/04/23
Mortality:
15,817
Mortality Rate:
5.5%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD, CMS, destocking through harvest
Targeted harvesting is ongoing, it is expected that the majority of the pens will be emptied but that few pens will remain site depending on fish health. The situation is being routinely assessed. FHI to monitor.

Date:
24/04/23-30/04/23
Mortality:
6,271
Mortality Rate:
2.90%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD, CMS, destocked through harvest
Targeted harvesting has temporarily stopped as the worst affected fish have been harvested. Currently 3 pens still on site containing 82,000 fish. Freshwater treatment conducted on 20/04/23 to reduce gill issues and was successful. FHI to monitor.

Date:
08/05/23-14/05/23
Mortality:
1,022
Mortality Rate:
1.30%
Reason given: Virus disease
Virus disease
CMS

Date:
26/06/23-02/07/23
Mortality:
726
Mortality Rate:
1.5%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest; Business contacted: Site planned fallow 2023wk32.
Business contacted for additional information. FHI to monitor.

Date:
03/07/23-09/07/23
Mortality:
509
Mortality Rate:
1.10%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest, only two cages left onsite. FW treatment has just been completed. Site plans to fallow by the middle of August.
Site contacted for further information, FHI to monitor.

Date:
10/07/23-16/07/23
Mortality:
748
Mortality Rate:
1.6%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest; Site plans to be fallow in wk 30. Two pens are left on site.
Business correspondent contacted for further information. FHI to monitor.

Date:
17/07/23-23/07/23
Mortality:
843
Mortality Rate:
1.8%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest
Business correspondent contacted for further information. FHI to monitor.

Date:
31/07/23-06/08/23
Mortality:
381
Mortality Rate:
1.30%
Reason given: Virus disease
Virus disease
CMS; Destocking through harvest
FHI to monitor - Site due to fallow Wk 32

Date:
07/08/23-13/08/23
Mortality:
368
Mortality Rate:
1.30%
Reason given: Virus Disease
Virus Disease
CMS; Destocking through harvest
Site fallow, no further action.

Date:
21/08/23-27/08/23
Mortality:
377
Mortality Rate:
1.30%
Reason given: Virus Disease
Virus Disease
CMS; Harvesting to fallow
Site fallow

Date:
28/08/23-03/09/23
Mortality:
464
Mortality Rate:
1.70%
Reason given: Virus Disease
Virus Disease
CMS; Harvesting to fallow
Falllow date to be confirmed with business contact. Update7/9/23 - site is still stocked. reason provied for detail that it had been fallowed;" Easter Score holms is still stocked, but in the final stage of harvesting to fallow, only ~27k fish left. Perhaps the info was based on a telephone call to the site when they may have been expecting to go fallow within that week, but we may have had to reprioritise harvesting other sites. It is on our harvest schedule to empty as soon as we have a window".

Date:
04/09/23-10/09/23
Mortality:
325
Mortality Rate:
1.20%
Reason given: Virus Disease
Virus Disease
CMS; Harvesting to fallow
Business correspondent contacted. Site to be fallow by Wk 38. FHI to monitor.

Date:
11/09/23-17/09/23
Mortality:
721
Mortality Rate:
2.7%
Reason given: Virus Disease
Virus Disease
CMS; Harvesting to fallow
High percentage due to low numbers on site, fallow soon.

Date:
18/09/23-24/09/23
Mortality:
767
Mortality Rate:
2.90%
Reason given: Virus Disease
Virus Disease
Site fallow in wk 39
Site now fallow. No further action.

Source

Inspection reports

Case Number: 2020-0079


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Mortalities have been very low throughout cycle since stocking. Monitored daily by camera. First fish likely to be harvested in the next few months.
Sea lice counts very low. Sea lice skirts were in place prior to stocking and just recently removed. Two slice treatments administered one in April and one in July - July treatment due to slight rise in Caligus numbers observed. No other treatments conducted, company generally favour freshwater for sea lice treatments, however other methods are available - chemotherapeutants and optilicer. Details of decision making process for choosing intervention not written into sea lice management plan - to look further into this.
Top nets and predator nets in place - no issues with predation except some bird pecking earlier in cycle which was prevented by tightening sagging top nets.
All records except movement records inspected by remotely.
Site Inspection and sampling by
Stock on site appeared in good condition, site manager reported that gill health had been good this year and lice numbers are low. Fish sampled for VMD appeared healthy. During FW treatments, the site have been splitting the fish over two wells to reduce stocking density during treatment. Site reported very low mortalities attributed to treatments.
Restructuring within the MA with three new site managers (one looks after Score Holms and West of Burwick, one looks after
Langa Isle (East) and North Papa and the third looks after Setter Voe, which is operating out of old Skretting shed in
Scalloway.
FW treatment due to be conducted beginning of week 39. [Original PDF]

Case Number: 2022-0529


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Site inspection and paper work conducted by , observed by .
Site inspected in rough weather, visibility was poor and fish were residing deep within the pen. No moribund or lethargic fish observed during the physical inspection of the site.
Routine sea lice counts were being conducted during the time of visit, externally no clinical signs of disease was observed.
Moderate to severe gill damage was observed in most fish checked during the lice counts with most fish checked scoring high for PGD. There was a bloom of muggiaea atlantica (micro jellyfish) confirmed at the site in early October which has compromised gill health along with a touch of seasonal AGD. Staff have been monitoring the site daily for plankton levels and has confirmed that jellyfish counts in recent weeks have decreased. With the water temperature on site decreasing the site is hopeful to see an improvement in gill health in the coming weeks. Mortality has remained low and below reporting threshold for this production cycle.
The site treated with FW in week 42, Pen 3 suffered a treatment loss of 5,904 fish resulting from a handling error. Site still below reporting threshold for the week despite this loss.
Fish sampled for VMD appeared healthy from internal examination with the execption of the gills. [Original PDF]

Case Number: 2022-0585


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Last site inspection conducted on 26/10/2022.
Additional inspection carried out due to high mortalities reported to the FHI in weeks 48 and 49 2022 attributed to CGD, AGD, and treatment loss. This had to be done remotely because of weather issues and airport strikes.
Week 48 - 6.8% 55,944 fish
Week 49 - 7.7% 58,269 fish
A bloom of Muggiaea atlantica (micro jellyfish) compromised gill health in early October, along with seasonal AGD. Mortalities began to increase in week 47 and a wellboat freshwater treatment was carried out on 6/12 as mitigation. This however, resulted in higher mortality numbers. The site switched to hydrogen peroxyde treatments in the following days (12, 13, 16, 18,
19/12), which have been more successful. All affected cages have now been treated, and will be retreated in the coming weeks.
Only one cage on site is not being treated as it's not displaying gill issues/mortalities. The fish are Aquagen stock rather than
Stofnfiskur.
Company veterinarian currently out on site. [Original PDF]

Case Number: 2023-0009


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Following consecutive reports of mortality, a site visit was planned for the 24/01/2023. Weather did not permit the inspection of the site on the 24/01 and was rescheduled for the 25/01. Paperwork was inspected on 25/01/2023.
A bloom of Muggiaea atlantica (micro jellyfish) compromised gill health in early October, along with seasonal AGD and most recently diagnosed with CMS. PGD however is the main cause of mortality (24/01/2023). Following a passive surveillance inspection on the 20/12/2022, mortalities continued to be above the reporting threshold. The site conducted its last hydrogen peroxide treatment on 19/12/2022, which was found to be successful. No further chemical treatments have been conducted on site since 19/12/2022. FW is planned to be the next treatment and if weather permits begins w/b 30/01/2023. The FW treatments will target pens believed to cope with handling and attempts will lastly be made in pens 1, 2, 10, 11 (worst affected).
Harvest of worst affected pens is an option. Due to weather and prioritising mortality removal from site, fish health visits have been limited since 20/12/2022, however next scheduled visit along with routine histology, bacteriology and PCR is planned for the 26/01/2023.
The stock origins are from Girlsta Hatchery and Barcaldine Smolt Unit; with primary input of fish from Langa Isle (East) in
September and one pen stocked with transferred fish from Holms Geo in November, respectively.
Mortality (recent weeks):
20/12/2022-26/12/2022: 1.17%, 8074
27/12/2022-02/01/2022: 1.97%, 13470
03/01/2023-09/01/2023: 6.37%, 42780; pen 10, 4, 2, 1 most affected
10/01/2023-16/01/2023: 4.59%, 28820; pen 11, 10, 1 and 4 most affected
17/01/2023-23/01/2023: 2.82%, 16430; pen 10, 1, 5 most affected
White circular lesions were observed on the fish as well as some 'boils'/raised scales on a few fish both observed on site and during sampling. Bacteriology plates of the lesions were taken on F2, F3 and F4.
Last lice count was conducted on 29/12/2022. Weather and mortality removal have not permitted lice counts on site. Last lice counts were conducted using Optimease (only 7 day withdrawal compared to TMS). Fish are currently off feed.
FW treatment boat is planned to arrive on 30/01/2023 and plan is to prioritise to treat those with least mortality.
No cleanerfish held on site. [Original PDF]

Case Number: 2024-0213


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Wrasse were wild caught and sourced locally. Wrasse morts - 4 morts since first input on 21/06/2024.
Slightly elevated morts that were below reporting threshold were observed in Pens 9, 8, 10 during April 2024. This was attributed to previous fungal/ bacterial lesions before input - 14/05/2024 2766 (1%), 22/04/2024 3452 (1.3%), 29/04/2024 3954
(0.6%), 06/05/2024 5316 (0.8%). Morts decreased after this period.
Slice treatments w/c -22/06/2024 & 02/05/2024
Site has observed increase in jellyfish numbers.
General stock population was sitting deep in the water column shoaling well and had good feed response. During inspection it was observed that an average of 2 fish per cage had physical lesions on caudal fins, site noted it was attributed to bacterial infection but has not increased mortaility levels. Very low numbers of slender fish and spinal deformities were observed across site. At the time of inspection site had divers on site for mort removal.
Inspection and paperwork was conducted by whilst supervised by . [Original PDF]

Source