Average female lice per fish

Source

Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Vidlin Production cycle end date: Oct 2018
Total losses: 20.9 %

Vidlin Production cycle end date: Aug 2020
Total losses: 17.3 %

Vidlin Production cycle end date: Jun 2022
Total losses: 18.8 %

Source

Inspection reports

Case Number: 2020-0060

Download Excellent visibility on site at time of inspection, >6m. Fish observed shoaling well and showed good feeding response. Fish sampled for VMD in excellent condition. Sea lice numbers had been elevated, a thermolicer treatment was completed near the end of wk 7, there was an issue with the thermolicer and the treatment in cage 8 was stopped.
Site has been experiencing an increased problem with seal predation which began in August 2019, the site has Sapphire seal pro nets on all cages, weighted nets and an OTAQ ADD, they also have an Airmar ADD available. The cages are due to be replaced before next cycle and plan to have sinker tubes next cycle. Seal predation accounts for 32.5% of mortalities this cycle, this has not been an issue previous generations of fish.
Site was stocked, 7 out 12 cages, with lumpfish in December from Otterferry, lumpfish mortaity is currently 13% since input.
No moribund fish observed during inspection, 2 dead, both with predation damage were removed during the inspection. Some lethargic fish were observed in the cages that had recently finished physical treatment, however they looked in good condition and were shoaling.
Site has 6m sea lice sheilds installed on all cages. Only bath treatment this cycle has been a hydrogen peroxide treatment for
AGD, only other theraputant treatment has been SLICE. Site had been due to receive an additional input of lumpfish to stock the remaining cages.
Stock was also observed on camera system at shorebase, showing excellent shoaling behaviour. [Original PDF]

Case Number: 2022-0113

Download Remote inspection 19/04/22 by , observed by .
Site inspection and VMD sampling by , observed by
Site has been experiencing some CMS, the worst affected cages have been harvested. Other reported cause of mortality on site is seal predation, it was thought that this was likely masking mortalities that should have been attributed to CMS.
Site underwent a Thermolicer treatment at the start of April 2022, reported to have given good clearance.
Fish shoaling well and were deeper in the water. Approximately 7 seals observed in close proximity to the site and this had and affect on the salmon, with increased jumping. No equipment damage report on site and all cages have Seal Pro nets installed, all nets are fully tied to the handrail. There have been occasions where a seal has accessed a cage either over the hand rail or over the top of the net. The seals have waited for site staff to lower part of the net to the water line and the seal leaves the cage. No damaged to nets has been recorded or was reported. The seal issue has reportedly worsened this cycle, since the introduction of double nets to Dury Voe sites and the removal of ADD's. For next cycle the site plans to install double nets to all cages.
Thermometer No T304 used, option not available on case sheet
Site staff reported that O2 levels have been lower over winter than would be expected, new environmental monitoring system in use at site.
Daily water samples taken at site, no recent issues noted.
SSF are modelling for potential new site at the end of the Voe, which would be more exposed. [Original PDF]

Case Number: 2024-0212

Download General population of fish were shoaling as expected, responded to external stimuli and had a good feed response. On average 2 runts were observed per pen, but responded to stimuli. There were 4 morts removed across site at time of inspection. It was observed at the 4 most exposed pens at site, slightly increased presence of fish showing physical damage but were healing well. The observed physical damage was contributed by environmental events including extreme weather, low O2 and increased algae. Fish have since had numerous bath treatments.
2 healthy fish were removed from 2 different pens for VMD sampling. During VMD sampling visual inspection was conducted on the fish, fish were observed to be healthy. Sampled VMD fish in withdrawal from Optomease.
Inspection and paperwork was conducted by whilst supervised by . VMD sampled by . [Original PDF]

Case Number: 2024-0433

Download Site was inspected following reports to the FHI of mortalities above the reporting threshold. The mortalities reported were attributed to environmental and CGD/ gill health issues. Reported mortality events to the FHI - 07/10/2024; 1.2%(3860) environmental, gill health, CGD. 14/10/2024; 2.3%(7352) environmental, gill health, CGD, harvest. 21/10/2024; 2.3%(6736) environmental, gill health, CGD, harvest.
During the summer months the site was experiencing high numbers of jellyfish and low oxygen levels. Site had conducted net washing of the inner and outer nets on all pens to help increase oxygen levels.
Site had conducted FW/ FLS treatments between 17/09/2024 to 23/09/2024 and 25/10/2024 to 08/10/2024. FW/ FLS treatments was conducted over 12hrs per cage. Site representative suggested the length of treatment has attributed to some of the mortalities across site.
Cages 8, 10 and 18 had the highest mortalities across the site. Wk40; cage 8- 530 (1.82%) - due to this high mortality site started with FW/ FLS treatment. Wk41; cage 10- 642 (2.63%). Wk42; cage 8- 884 (3.13%), cage 10- 6891 (3.75%), cage 6-
885 (2.76%). wk43; cage 8- 736 (2.69%), cage 10- 1253 (5.48%). wk44; this all cages were being treated with FW/ FLS during this week all cages had low mortalities. wk45; cage 8- 1155 (4.34%), cage 10- 440 (2.04%), pen 18- 361 (1.44%)
The site was preparing to harvest pen 8 on the day of the inspection. Site is currently reducing stock on site through harvest to relieve stocking density pressures to help with mortalities. Stock is live haul via well boat to Lerwick processing plant to be harvested.
Company vet has advised site to be on starve for 10 days starting from 12/11/2024 whilst site is being harvested. Although, due to pen 8 experiencing the highest mortalities they have been on starve for approximately a week at time of inspection.
Health surveillance report conducted by company vet on 12/11/2024 observed some stock to have damage from sea lice but is healing well, although sea lice levels are low. No external signs of disease or infection were observed. Haemorrhaging in the swim bladder and very occasional signs of AGD in the gills were observed. Some Aeromonas sp was also observed. In the report there was suggestions of furunculosis and Yersinia ruckeri (bacterial infection). Histology and PCR samples were taken and awaiting results. Histology results from 19/10/2024 found no significant results - it was observed in the histology samples moderate levels of liver necrosis and moderate gill necrosis and haemorrhaging/ inflammation.
General population were swimming and shoaling and were observed to be in good body condition. It was observed that some of the general population had physical damage that was healing. In the observed cages there were a high number of lethargic fish hanging close to the net. 3 moribund and 1 runt was observed across the inspected cages. In pen 10 it was observed that there was a moderate number of fish with sea lice damage on their heads but healing well - note no sea lice was observed on sampled fish. 3 fish were removed for diagnostic sampling (2 moribund and 1 healthy fish (healthy fish was also sampled for
VMD). The 3 fish sampled internally were observed to have no clinical signs, note there was strong adhesions around the spleen and fish 2 had haemorrhaging on the swim bladder.
Inspection and paperwork was conducted on site by whilst supervised by . Diagnostic sampling and VMD sampling conducted by whilst supervised by [Original PDF]

Source