Average female lice per fish

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Salmon Scotland mortality

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Cumulative mortality over full production cycle

Toyness Production cycle end date: May 2018
Total losses: 6.2 %

Toyness Production cycle end date: Jul 2020
Total losses: 8 %

Toyness Production cycle end date: May 2022
Total losses: 32.1 %

Toyness Production cycle end date: May 2024
Total losses: 24.5 %

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Inspection reports

Case Number: 2021-0452

Download Fish came on from Barcaldine Smolt Unit (FS1328) over 3 inputs during September, October and Novemeber 2020.
Mortality event w/b 20/09 -
Sudden increase in mortality in cages 3,4,5,6,7,9 and 10, low ambient and in-cage dissolved oxygen. No signs of physical damage were observed on the fish (internal and external). Feeding rate also reduced during this time.
Mortality the week before was 0.25%. Cages 1,2 and 3 had a hydrolicer treatment and the mortality was attributed to this handling event and acounted for the majority of mortalities that week. IN general, mortalities at the site have been low since input with mortalities being attributed to planned handling events.
Fish have reportedly been in good physical health, with a low lice burden that was treated. AGD treatment shortly after input and recent swabs have returned moderate AGD positive. Treatment options are currently being arranged. Fish were feeding well prior to the mortality event and have had a demonstrated a high conversion rate.
Dissolved oxygen at the site dropped from >10mg/l down to <6mg/l during the week of the mortality event.
Current working diagnosis of the mortality event has been attributed to heart failure due to impaired respiration associated with
CGD during a period of hypoxia.
Site emergency harvested the worst affected cages.
First cycle of stocking wildcaught wrasse. 12,187 wrasse were input to the site on 16/09/2021. 5,765 (47.3%) fish were removed at the same time the Salmon were harvested from the worst affected cages following the mortality event on 26/10/21.
No other mortality has been recorded since input in September. Site manager reported that the wrasse were having a positive effect on reducing the lice count across the site. Albeit, sea lice counts have been low this cycle.
Weather was very poor on day of inspection. Inspector walked round 2/5 cages before the large swell was compromising safety. The remaining cages were inspected from the boat.
The fish were difficult to see as they were sitting deep in the water and were not surfacing for feed. No moribunds observed in any of the cages and only 1 mortality was noted across the site, although not fresh dead so not sampled.
Fish sampled for VMD appeared healthy. [Original PDF]

Case Number: 2023-0426

Download - ECI/SLA Paper work completed 09/09/2023. Site inspection carried/VMD sampling carried out on 24/10/2023 by , observed by
Toyness is a nursery site for Bring Head
2020: 16/09/2021 - wrasse. Wild caught Orkney wrasse.
Site stocked from Stofnfiskur and Aquagen eggs, from Knock and Barcaldine.
29/07/2023 to 07/08/2023 - florfenicol treatment
Mechanical treatment - Hydrolicer 10/08/2023 27/08/23
Thermolicer - 16-18 june wk 24 all pens
Salmosan treatment 08/06, too warm so only pens 1 and 3 done
Slice 09-15 may 23, wk 19, all
Fish input to site 1/09/2022 wk 36.
All harvests are live haul.
Furunc (type 1) had been identified back in June 2023 and picked up during routine gill samples. Antibiotic sensitivity testing conducted and anitibiotic administered prior to hydolicer treatmemt. Hydrolicer was very effective for the lice control.
Optoscale camera system is used on site to estimate biomass. System can also detect skin damage and takes 50,000 photos per day.
Mortalities for the last four weeks mainly attributed to environmental gill insults and some physical damage. Oxygen levels have been reported to be low in scappa flow
Site will begin harvesting next week, in order to maintain stocking density.
Inspection conducted by (observed by ). Follow-up inspection carried out on 24/10/2023 as site inspection/sea lice count could not be carried during previous inspection. Inspection took place directly after stormy weather. Due to the exposed nature of the site, four pens were inspected to witness sea lice counts. Directly before this inspection an escapes notification was recieved from the site, as a seal was found in a pen. An escapes investigation was conducted and an enhanced containment audit is scheduled wb 04/12/2023.
SLA report checked by 22/05/2025. [Original PDF]

Case Number: 2023-0520

Download No fish health issues in the last four weeks. Passive grading just completed some physical damage. Furunc had been identified on site but no issues in the last four weeks.
Last inspection 13/9/2023.
Escapes information: 22/10/2023 a seal was observed in pen 10, divers were on site to conduct a site containment check due to three continuous days of poor weather. Some time given to see if the seal would leave by itself but this did not occur so divers entered the cage and patched the hole which was 5 or 6 meters down and was 40 x 40 cm. It took 1 hour, from the first observation of the seal to the pen being made secure. The fish were shoaling well and no escapees observed so not thought that any escapes would have occurred. No subsequent decrease in appetite noted for the pen.
Newly serviced nets have been ordered and a complete replacement will occur when boats are available. The nets are sapphire nets. The site is to have 120m pens installed at the end of this cycle which is why brand new nets are not being
Movement records were to be inspected in the office following the offshore part of the CNA but issues with a rope snagging the prop of the work boat delayed the return to shore, copies have been requested to be emailed.
Issues raised, movement records were provided 19/1/2024. [Original PDF]

Case Number: 2025-0239

Download Fish input onto site in Nov 2024 from Girlsta Hatchery, with last stocking date occurring on 21/11/2024. The last crop were transferred off site in week 23 2024. In the next ~4 weeks, wrasse will be input to site; wild caught ballan wrasse from Orkney.
The site has recently undergone a full grid/equipment change (planning permission granted in 2021). Site now has 12 pens at
120m. Seal pro nets are being used as well.
Slice treatment cleared on 13/05/2025; fish are no longer in withdrawal.
2024: wk 15, 1.01%,1538; wk16, 1.99%, 3006; Wk17, 1.76%, 2376; wk18, 1.60%,1815; wk19, 1.16%, 1297; wk20, 1.19%,
1036; wk21, 1.43%, 624; 1.80%, 235 (all CMS related)
The FMA has ceased at the start of this production cycle, and replaced with a FMS as businesses within the management area do not fallow synchronously.
Paperwork except for movement & transport records inspected remotely on 24/06/2025. Some slight discrepancies in the reported sea lice figures were observed during the remote paperwork inspection. A request was made to resubmit these to match the figures held by the business and an issue was raised. Issue was resolved on 29/07/2025 following receival of records which were found to be adequate.
During site visit, only 2 moribund/dead fish were observed. Fish were seen shoaling and feeding well. Site was conducting lice/gill checks and observed fish were in good condition, with few shortened opercula. Fish sampled for VMD appeared in good condition and healthy, internally and externally. [Original PDF]

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