Average female lice per fish

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Salmon Scotland mortality

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Cumulative mortality over full production cycle

Balta Isle Production cycle end date: Aug 2019
Total losses: 6.1 %

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Inspection reports

Case Number: 2021-0224

Download Remote inspection carried out by , observed by , on 16/07/2021. Physical inspection carried out by , observed by
on 20/07/2021.
VMD sampled by , observed by .
Q14 SLI - If fish are held without treatment for sea lice during harvest then welfare of fish is prioritised. Any pens that have an increase in lice numbers will be harvested first, or harvest will be postponed to treat to prevent part populations being held without treatment. [Original PDF]

Case Number: 2023-0239

Download Site inspected in a calm sea sate with good visibility. Fish were observed shoaling and responding positively to routine feeding regimes. No clinical signs of disease were observed during the inspection, fish sampled for VMD appeared healthy both externally and internally.
Fish at Balta Isle tested positive for PD in December 2023 and have been subject to reduced apatite until recent weeks. During the inspection of the site, a larger than normal range in fish sizes was observed in the worst affected pens for PD (Pens 1 & 2).
Despite the PD diagnosis, mortality onsite has remained very low throughout the duration of the current production cycle.
The site treated with freshwater from 27th April to 20th May 2023.
Balta Isle operates souly within its own disease management and acts as a nursery site supplying stock for further ongrowing at Cooke Aquaculture sites in Shetland. [Original PDF]

Case Number: 2025-0138

Download Site is used as a nursery site
Mortality: Wk21 2024 4.73% (58,787 fish) attributed to transport and handling during a treatment. Had not been reported to
FHI at the time and has now been reported.
Treatments: This cycle: SLICE Dec 2024, Antibiotics for bacterial disease Nov 2024 (prescription). Last cycle: SLICE March
2024 and Dec 2023
Prescription seen for Veterin treatment - dated 29th October 2024.
Health surveillance: Dated 25th March 2025 - nothing significant, low numbers of lethargic fish. Gills - some AGD lesions.
Remote inspection carried out on 24/04/2025. Physical inspection carried out 29/04/2025. Fish were observed shoaling deep in the water column. While on site, 13 pens were observed feeding and all had good feed responses. Two moribund fish were seen on site as well as one lethargic fish.
VMD sampled from pen 10. The fish taken for VMD appeared healthy externally and internally with no sea lice observed [Original PDF]

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