Salmon Scotland mortality

Source

Cumulative mortality over full production cycle

Production cycle end date: May 2019
Total losses: 23.3 %

Production cycle end date: Sep 2020
Total losses: 78.3 %

Production cycle end date: Feb 2021
Total losses: 4.5 %

Source

Inspection reports

Case Number: 2020-0249

Download PSI conducted in response to mortality report submitted by company on 02/07/2020.
Site was treated with Salmosan during WK23 and WK24. Mortality figures are as follows:
WK24 - 2028 (0.47%)
WK25 - 5751 (1.33%)
WK26 - 11,197 (2.62%)
WK27 - 2769 (0.67%)
Mortality has been attributed to sea lice treatments and has returned below the reporting threshold.
Two other mortalities over 1% had occurred at the site (WK14, WK15) both of which were reported to the Inspectorate.
Current lice levels on site were 2.07 AF and another Salmosan treatment is planned for WK28.
Sea lice levels on site were -
WK25, 1.5, WK 24, 4.1, WK23 2.4. WK22 1.37, WK 21 1.64, WK20 1.1 [Original PDF]

Case Number: 2020-0335

Download Week 33 - 107700 - 27.65%
Week 32 - 5400 - 1.37% - Not reported.
Week 31 - 3726 - 0.93% -
Week 30 - 3124 - 0.78%
Mortalities attributed to CGD and jellyfish.
Planning to go in with freshwater next week to treat gills, had previously been treating with peroxide and salmosan.
The vet is on site today (21st August) waiting for histo results, and then a vet report will be sent out in the next few days regarding the current on site mortality.
Fish were observed shoaling well deeper in the water. Although a lot of fish were observed which appeared lethargic, these fish were very reactive and swam off quickly. 8 dead observed across site, with exception of cage 8 where 20 dead were observed on surface, not fresh dead, these were removed by site staff at the time of inspection. The site staff that usually operate at this site were assisting with a FW treatment at Gob na Hoe, and were due to return to site in the afternoon to do daily checks.
Jellyfish numbers increased quickly over a short period of time, resulting in the high losses week 33, mortality numbers were decreasing, but still elevated. A FW treatment was due to be conducted during week 34/35, it was hoped that this would help alleviate some of the losses due to gill issues. If the FW treatment isn't successful, the Norwegian Gannet is booked for early
September and will harvest the whole site over a few days.
Uncertain of future stocking of sites within the DMA.
DELAY IN ISSUING REPORT, SITE HAS BEEN TRANSFERRED TO A DIFFERENT APB,
APB AT TIME OF INSPECTION NOW DEREGISTERED. NO REPORT ISSUED
Paperwork by
Site inspection and sampling by accompanied by APHA [Original PDF]

Source