Site Details: Swarta Skerry, Dury Voe

Swarta Skerry
Dury Voe, Laxo
ZE2 9QD
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: May 2021
Total losses: 17.8 %

Production cycle end date: Dec 2022
Total losses: 41.5 %

Source

Fish Health Inspectorate mortality

Date:
22/08/22-28/08/22
Mortality:
6,316
Mortality Rate:
1.4%
Reason given: Gill Health Related
Gill Health Related
CGD, FW treatment scheduled
Freshwater treatment currently underway. FHI to monitor.
Date:
29/08/22-04/09/22
Mortality:
8,765
Mortality Rate:
2.00%
Reason given: Gill Health Related
Gill Health Related
CGD, FW treatment in wk 36
Second week of increased mortality. FW treated week 36 FHI to monitor if figures impove post treatment.
Date:
05/09/22-11/09/22
Mortality:
6,798
Mortality Rate:
1.60%
Reason given: Gill Health Related
Gill Health Related
CGD, FW treatment in wk 36
Numbers reducing post FW treatment. FHI to monitor.
Date:
12/09/22-18/09/22
Mortality:
4,832
Mortality Rate:
1.20%
Reason given: Gill Health Related
Gill Health Related
CGD, FW treatment in week.
Numbers reducing post FW treatment. FHI to monitor.
Date:
02/10/22-09/10/22
Mortality:
4,184
Mortality Rate:
1.1%
Reason given: Environment; Gill health Related
Environment; Gill health Related
CGD; diagnostics confirmed elevated PGD
Site contacted for further information and explained 'Late generation PGD from a recent enviromental insult, destocking through harvest to commence over next few weeks'. FHI to monitor.
Date:
10/10/22-16/10/22
Mortality:
9,207
Mortality Rate:
2.50%
Reason given: Environment; Gill health Related
Environment; Gill health Related
CGD
PGD from a recent enviromental insult, destocking through harvest to commence over next few weeks. FW treatments ongoing. FHI to monitor.
Date:
17/10/22-23/10/22
Mortality:
6,453
Mortality Rate:
1.80%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD; CMS confirmed
Numbers decreasing destocking through harvest to commence over next few weeks. FW treatments ongoing. FHI to monitor.
Date:
24/10/22-30/10/22
Mortality:
7,835
Mortality Rate:
1.90%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD; CMS
Site contacted for further information. CMS confirmed onsite, gill health is improving following FW treatment. Harvesting due to commence soon with a targeted fallow date towards the end of December. FHI to monitor.
Date:
31/10/22-06/11/22
Mortality:
9,375
Mortality Rate:
2.50%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD; CMS; post physical delicing
Harvesting to commence soon with a targeted fallow date towards the end of December. FHI to monitor.
Date:
07/11/22-13/11/22
Mortality:
13,617
Mortality Rate:
3.70%
Reason given: Gill Health Related; Virus disease
Gill Health Related; Virus disease
CGD; CMS; post physical delicing
Harvesting to commence soon with a targeted fallow date towards the end of December. Mortality increase due to treatment. FHI to monitor.
Date:
21/11/22-27/11/22
Mortality:
42,629
Mortality Rate:
12.20%
Reason given: Virus disease
Virus disease
CMS; harvesting to fallow
CMS related mortality, site being harvested out started 22/11/22 seven pens left on site, should be empty shortly. FHI to monitor.
Date:
28/11/22-04/12/22
Mortality:
32,742
Mortality Rate:
14.90%
Reason given: Virus disease
Virus disease
CMS; harvesting to fallow
Mortalities increasing. Contacted business for a fallow date and look at possibility of Shetland trip to visit. Update 13/12/2;2 Fallow date set for 3/1/23. Site already well destocked. Unannounced inspection carried out 23/11/22 but unable to access site due to weather.
Date:
05/12/22-11/12/22
Mortality:
3,807
Mortality Rate:
3.30%
Reason given: Virus disease
Virus disease
CMS; harvesting to fallow
Big decrease in reported mortalities from previous week, Unannounced inspection carried out 23/11/22 but unable to access site due to weather. Fallow date planned for 3/1/23
Date:
12/12/22-18/12/22
Mortality:
3,001
Mortality Rate:
5.20%
Reason given: Virus disease
Virus disease
CMS; harvesting to fallow
Unannounced inspection carried out 23/11/22 but unable to access site due to weather. Fallow planned for 03/01/23. FHI to monitor.
Date:
19/12/22-25/12/22
Mortality:
4,810
Mortality Rate:
12.80%
Reason given: Virus disease
Virus disease
CMS; harvesting to fallow
Site fallow, no further action.
Date:
26/12/22-01/01/23
Mortality:
628
Mortality Rate:
6.10%
Reason given: Virus disease
Virus disease
CMS;site fallow in week
Site fallow, no further action
Date:
15/01/24-21/01/24
Mortality:
2,580
Mortality Rate:
1.20%
Reason given: Environmental
Environmental
Post storm/weather
First report this cycle. FHI to monitor.
Date:
22/01/24-28/01/24
Mortality:
5,474
Mortality Rate:
1.1%
Reason given: Environmental
Environmental
Post storm/ weather
FHI to monitor.

Source

Inspection reports

Case Number: 2020-0062


Download Recent mortalities due to physical damage from bad weather and seals scaring fish, making them burrow. On inspection of stock on site, could see mild physical damage on the heads and on the flanks, but vast majority of the fish appeared in good condition. One to two moribund fish close to the surface per pen but were swimming away on closer inspection.
Morts disposed of by Pelagia Shetland Ltd. Allowed to use Waste to Energy incinerator in Lerwick if less than 1 tonne/week.
Arrangements and storage of dead fish not in FMS but is in waste management plan. Nothing in FMS regarding sensitivity testing but is in VHP. Biological controls are in FMS but doesn't include under what circumstances they will be used under. Site manager says that they are planned to be used as a routine prevention measure and will be introduced at the start of each cycle. [Original PDF]

Case Number: 2022-0109


Download Remote inspection 19/04/22 by , observed by
Site inspection and VMD sampling 26/04/22 by , observed by
Site had experienced low level AGD from PCR screening, not causing issues on site and levels from recent samples have decreased.
Very good visibility at time of inspection. Fish were shoaling deeper in the water. Fish sampled for VMD appeared healthy.
Site were conducting sea lice counts at time of inspection, 10 fish per cage. Physical treatments recently undertaken on site for sea lice, thermolicer and two cages with the hydrolicer. There were 1 to 2 lethargic fish in the cages treated with the
Thermolicer, but noticeably more lethargic fish observed in cages recently treated with the hydrolicer, some with varying degrees of physical damage. The Thermolicer treatments were conducted using the new purpose built Inverlussa boat, which was reported to be very effective and had capacity to treat a cage quicker than previous thermolicers used.
All cages have double nets installed
T304 used, however not in drop down list therefore left blank. [Original PDF]

Case Number: 2022-0598


Download Fish are taken whole by Henderson and transported to Pelagia for biogas generation.
Mortality has been ongoing since WK 34. It has been attributed to CMS and CGD.
Freshwater has been used to treat gills and lice, however recently the hydrolicer has been used to treat for sealice as the gills are compromised. Cages 6, 10 are worst affected by sealice (average across the site was ~2.71 WK 46) and have been scheduled to be harvested WK47, although this is dependant on weather.
WK43 - HydrL
WK45 - HydrL
WK34 Peroxide treatment, one cage was done, but aborted after 1 cage as fish suffered high mortality.
WK35 - FW treatment
WK40 - Hydrolicer treatment
WK41 HL
Site is currently harvesting - worst affected cages (sea lice) are being harvested out first and will be emptied this week, followed by cage 10.
Physical inspection of cages could not be undertaken due to weather.
Inspection completed by observed by [Original PDF]

Source