Site Details: Swarta Skerry, Dury Voe
Dury Voe, Laxo
ZE2 9QD
Water type: Seawater
Cumulative mortality over full production cycle
Swarta Skerry Production cycle end date: May 2021
Total losses: 17.8 %
Swarta Skerry Production cycle end date: Dec 2022
Total losses: 41.5 %
Fish Health Inspectorate mortality
22/08/22-28/08/22
6,316
1.4%
29/08/22-04/09/22
8,765
2.00%
05/09/22-11/09/22
6,798
1.60%
12/09/22-18/09/22
4,832
1.20%
02/10/22-09/10/22
4,184
1.1%
10/10/22-16/10/22
9,207
2.50%
17/10/22-23/10/22
6,453
1.80%
24/10/22-30/10/22
7,835
1.90%
31/10/22-06/11/22
9,375
2.50%
07/11/22-13/11/22
13,617
3.70%
21/11/22-27/11/22
42,629
12.20%
28/11/22-04/12/22
32,742
14.90%
05/12/22-11/12/22
3,807
3.30%
12/12/22-18/12/22
3,001
5.20%
19/12/22-25/12/22
4,810
12.80%
26/12/22-01/01/23
628
6.10%
15/01/24-21/01/24
2,580
1.20%
22/01/24-28/01/24
5,474
1.1%
Inspection reports
Case Number: 2020-0062
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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
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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
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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]
Case Number: 2024-0080
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Site inspected in overcast conditions with a flat sea state, visibility of the stocks was good. Fish were observed shoaling well and responding positively to hand feeding. 5 moribunds (pens 2, 4, 10) were observed during the inspection of the site. 2 fish displaying an abnormal swim behaviour was also observed in pen 10. Site staff were conducting lice counts during the time of inspection, fish appeared healthily with clean gills and good body condition.
3 fish were removed for VMD sampling, 1 fish from pen 1 and 2 from pen 5, the fish appeared healthy both internally and externally.
Lice counts in recent weeks have been elevated and above suggested criteria for treatment advised by the CoGP. the Most recent treatments conducted was a thermolicer treatment on 17/05/24 and prior to that a Salmosan treatment commencing on
05/04/2024. The site are planning to treat again with Salmosan commencing on 28/05/2024. The site are currently using MS-
222 for anesthetization. No physical damage was observed on any of the stocks during the physical inspection of the site. [Original PDF]