Free Salmon - Ouseness

Site Details: Ouseness

Unit 3 Quarry Road
Pierowall Westray
KW17 2DH

Operator: Cooke Aquaculture Scotland Ltd
Water type: Seawater

Average female lice per fish

Salmon Scotland mortality

Cumulative mortality over full production cycle

Production cycle end date: Aug 2018
Total losses: 13.7 %

Production cycle end date: Dec 2019
Total losses: 2.2 %

Production cycle end date: Nov 2020
Total losses: 0.7 %

Production cycle end date: Oct 2021
Total losses: 12.3 %

Fish Health Inspectorate mortality

Date:
04/04/22-10/04/22

Mortality:
20,954

Mortality Rate:
5.86%

Reason given: Transfer & Bacterial Morts

Transfer & Bacterial Morts

Site manager contacted. Fish have been transferred onto site 6-7 weeks ago from Loch Garasdale. Fish were noted to be soft and with fungus on gills and fins. Transferred at an average weight of 200-250g. When fish mortality began to increase, histology was sent away to be analysed. Histology report was inconclusive; a multitude of bacteria was found, with no specific pathogen identified. In addition, fish were keeling over in pens, which was attributed to the lice skirts. Site was noted to be shallow and lice skirts may be hindering adequate flow and reducing oxygen. These skirts were removed and mortality has been found to decrease; ~3% w/b 11/04. A second sample was sent for histology analysis. Antibiotic treatment via in-feed method will be used if results from second histology are significant. FHI to visit w/b 17/05/2022. FHI to monitor.

Date:
11/04/22-17/04/22

Mortality:
10,717

Mortality Rate:
3.25%

Reason given: Transfer & Bacterial Morts

Transfer & Bacterial Morts

Second consecutive week above reporting level. Further information with MRT0918. Site manager contacted the results of the second batch of histology samples are still outstanding. FHI to visit w/b 17/05/2022. FHI to monitor. APHA informed.

Date:
18/04/22-24/04/22

Mortality:
17,495

Mortality Rate:
5.48%

Reason given: Transfer & Bacterial Morts

Transfer & Bacterial Morts

See previous weeks entries. Site manager contacted to request update and results from further histo samples. APHA informed by FHI last week. FHI to visit w/b 17/05/2022. FHI to monitor.

Date:
25/04/22-01/05/22

Mortality:
14,606

Mortality Rate:
4.84%

Reason given: Transfer & Bacterial Morts

Transfer & Bacterial Morts

From further histology samples it has been reported that the pathology appears most likely to indicate primary skin trauma, with secondary bacterial ulceration and penetrating infection. Histology report has been requested. APHA informed and FHI to visit w/b 17/05/2022. FHI to monitor.

Date:
02/05/22-08/05/22

Mortality:
7,245

Mortality Rate:
2.52%

Reason given: Transfer & Bacterial Morts

Transfer & Bacterial Morts

See previous entry - FHI to visit WB 17/05/2022

Date:
09/05/22-15/05/22

Mortality:
6,078

Mortality Rate:
1.97%

Reason given: Transfer & Bacterial Morts

Transfer & Bacterial Morts

Numbers expected to reduce, FHI to monitor. FHI site visit conducted WB 16/05/2022 and DIA samples taken.

Date:
14/11/22-20/11/22

Mortality:
3,943

Mortality Rate:
3.02%

Reason given: Gill Damage/Other

Gill Damage/Other

Mainly gill damage due to plankton. No treatments planned but will moniitor the situation. Early maturation also reported. FHI to monitor.

Date:
28/11/22-04/12/22

Mortality:
3,632

Mortality Rate:
3.18%

Reason given: Gill Damage/Other

Gill Damage/Other

Mainly gill damage due to plankton. Early maturation also reported. FHI to monitor.

Date:
05/12/22-11/12/22

Mortality:
1,801

Mortality Rate:
1.63%

Reason given: Gill Damage/Other

Gill Damage/Other

Gill issues are improving with the colder weather. Mortality decreasing from previous week. FHI to monitor.

Date:
12/12/22-18/12/22

Mortality:
3,580

Mortality Rate:
3.29%

Reason given: Gill damage/Other

Gill damage/Other

Area manager contacted. Increased mortality attributed to gill issues and fish maturing early. Fish went onto site in March 2022 and have had very few problems. However, fish started maturing a lot earlier than usual and consequently dying. Lights have since been installed on site and maturation rate and mortality are falling. FHI to monitor.

Date:
19/12/22-25/12/22

Mortality:
2,396

Mortality Rate:
2.28%

Reason given: Gill Damage/Other

Gill Damage/Other

Site contacted for further information. Mortality has reduced from previous week. Gill health issues is the main cause for mortality, primarily AGD. The site has also experianced some die off of mature fish. The site plans to treat with freshwater over the coming weeks. FHI to monitor.

Date:
26/12/22-01/01/23

Mortality:
1,760

Mortality Rate:
1.71%

Reason given: Gill Damage/Other

Gill Damage/Other

Mortality has reduced from previous week. AGD is the primary cause of mortality. FW treatment commenced Wk 1 2023 and will be completed Wk 2 2023. Mortality has decreased below threshold for following week. FHI to monitor.

Date:
09/01/23-15/01/23

Mortality:
3,528

Mortality Rate:
3.51%

Reason given: Gill Health/Environmental

Gill Health/Environmental

Primary cause is AGD. Mortality did reduce below reporting level for wk 1, 2023 but has gone back above for week 2. Business correspondant contacted and mortality levels have dropped below reporting levels for wk 3. FHI to monitor.

Inspection reports

Case Number: 2022-0101

Download 2022 S1: Wk 14, 27501, 7.70% (includes mortality that is related to post transfer mortality and is within 6 weeks). Most affected pens on site are pen 9,10 and 11.
Stock from Loch Garasdale. Only transferred onto site Wk 7 of 2022. Mortality has been above 1% even after 6 weeks post transfer. Stock was transferred onto site at 200-250g due to site having experienced a delay in fallowing and fish were ready for ongrowing. Ouseness is conducting organic production with no cleanerfish present on site.
Prior to transfer, fungus was observed in fish at Loch Garasdale. Fish are transferred on site by Migdale wellboats.
Site has access to ROV and conducts a yearly survey of the nets on site. In addition, mortality is removed/uplifted and checked with the 'Foover'.
Transfer of the fish occurred during stormy weather, including a long journey in the wellboat. This resulted in scrubbing of flanks of the fish into the pens. Fungus increased on these scaled areas. Mortalities began to increase and were attributed to the transfer journey. Further increases in mortality occurred and health visit on the 22/03/2022 from company vet team was conducted with histology and PCR samples sent for analysis. Histology returned with conclusion that primary skin trauma, with secondary bacterial ulceration and penetrating infection were the cause of mortalities. PCR samples came back negative. As mortalities continued to increase, most recent screening has been conducted (PCR) and samples were positive for moritella and Tenacibaculum maritimum. FHI conducted a diagnostic test on 17/05/2022.
4 fish were sampled during diagnostic test. All fish were found to possess lesions on flanks.
Remote inspection conducted by on 13/05/2022, supervised by .
Site inspection conducted by on 17/05/2022, supervised by . Diagnostic samples also taken on this date. Company vet accompanied the inspection. In addition, VMD samples were taken on 17/05/2022 by . [Original PDF]