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Average female lice per fish

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Salmon Scotland mortality

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Cumulative mortality over full production cycle

Gob na Hoe Production cycle end date: May 2019
Total losses: 17 %

Gob na Hoe Production cycle end date: Apr 2021
Total losses: 14.1 %

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Inspection reports

Case Number: 2024-0205

Download Wrasse mortality last four weeks: 53 (1.97%).
Sal mortalities last four weeks: wk 26 4470 (1.53%) mainly post treatment, wk 25 1510 (0.51%) mainly post treatment, wk 24
342 (0.11%), wk 23 262 (0.09%).
Salmosan treatment administered during transfer onto site with discharge occurring at Leinish.
Only sea lice medicine available is hydrogen peroxide. FW and wrasse are the main sea lice treatments but mechanical treatments could be administered if required.
On inspection of the site a number of lethargic fish were observed with physical damage, three were removed for further examination but no gross pathology was noted. There was an issue with a FW treatment the week before which resulted in some abrasion. Site staff have been removing moribunds on a daily basis. The general population appeared in good general health and were shoaling and feeding well.
Site was stocked with a sw to sw transfer from two separate management areas (Stock from Loch A Chairn Bhain (FS0621)
(known by the company as Reintrad) and Loch Maddy (FS0853). Risk assessment for these movements was available however these types of movement are not in compliance with the CoGP.
Records were inspected remotely on the 27th, 28th June and also the 1st and 2nd July. Records were also inspected on the day of inspection.
Issues raised: information was provided on the 2/9/2024 to clear the issues raised. [Original PDF]

Case Number: 2025-0424

Download Next input will be cleaner fish: ballan wrasse. Wild caught most likely from around Skye.
Micro jellyfish were reported as the primary cause of the mortality, specifically Muggia atlantica.
Routine mortality is usually disposed of using ensiler on the barge. Mass mortality is being disposed of via dead haul to Pelagia
(in the Shetland Islands) and Whiteshore.
Barbed wire jelly fish observed visually with the naked eye on site (they cannot be collected using the plankton sweeps due to size).
First mention of barbs in log was 30/08. These were observed on and off until late Sept. Muggia were first observed in late Aug
2025 and have been the only species present in plankton samples since early Oct. Of recent Muggia has been at levels of 22-
80 jellyfish per m3 (since 09/10). Barbs peaked at 92 jellyfish per metre in August (30/08)
AGD was first picked up in wk 14 at low levels from clinical signs, although PCR tests were negative at this time. First picked up via PCR from gill swabs in wk 26 at low levels. Wk 27 the AGD was becoming more of a problem.
Vet report from Pharmaq on 14/10/2025: moderate levels of AGD reported. Biologist told verbally that the jellyfish damage must heal before treating AGD with freshwater.
AGD scores were at 2 (0= perfect, 5= very poor) in week 41 and remained high at 1.26 last week. Treatment started on
Monday before inspection. Treatment to last until this weekend (08/11-09/11).
Wk 35 AGD score was 1.65 which decreased to 0.53 following treatment in wk 35.
At the time of the inspection a treatment vessel was on site that had treated 5 of the 8 stocked cages. Cages 1,3 and 8 not treated yet as they were least effected. 142,845 morts this week. Mostly from cage 8 with 106,880.
Mortality worst in cages 4 and 6. Cages were treated by prioritising cages with highest mortality.
SLICE treatments carried out in weeks 33+34. Lice levels before treatments were 1.96 caligus and 0.15 for gravid leps. These figures dropped to 0.16 and 0.06 respectively.
SLICE treatment in mid-July wk 28+29. Lice levels before 0.97 for caligus and 0.28 for female leps. Before figures dropped to
0.38 and 0.08 respectively.
Lice levels very low the week before the inspection. Female leps 0.09 and caligus at 0.06 [Original PDF]

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