Site Details: Muck
Isle of Muck
Inverness-shire
PH41 2RP
Water type: Seawater
Cumulative mortality over full production cycle
Muck Production cycle end date: Apr 2018
Total losses: 2.6 %
Muck Production cycle end date: Feb 2020
Total losses: 39 %
Muck Production cycle end date: Jun 2022
Total losses: 2 %
Muck Production cycle end date: Aug 2023
Total losses: 8.1 %
Muck Production cycle end date: May 2024
Total losses: 9 %
Fish Health Inspectorate mortality
03/01/22-09/01/22
934
1.68%
29/08/22-04/09/22
16,009
2.18%
05/09/22-11/09/22
98,953
13.79%
12/09/22-18/09/22
64,473
15.54%
19/09/22-25/09/22
1,225
2.11%
10/07/23-16/07/23
2,896
1.37%
17/07/23-23/07/23
4,215
2.69%
24/07/23-30/07/23
2,021
1.42%
31/07/23-06/08/23
2,092
2.17%
07/08/23-13/08/23
1,502
2.60%
06/11/23-12/11/23
8,039
1.00%
27/11/23-03/12/23
9,703
1.31%
23/09/24-29/09/24
10,223
1.60%
30/09/24-06/10/24
22,330
2.40%
07/10/24-13/10/24
34,818
2.67%
14/10/24-20/10/24
64,152
5.06%
21/10/24-27/10/24
52,932
4.39%
28/10/24-03/11/24
52,934
4.60%
04/11/24-10/11/24
22,578
2.05%
11/11/24-17/11/24
12,761
1.19%
Inspection reports
Case Number: 2021-0431
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Targeted harvesting on-going on site. Pen 1 being harvested currently, pen 12 next. Likelihood that whole site will be harvested out will be quite high, but restricted with availability and weather.
Weather significant factor with harvesting, treatments and morting.
Operator fed through jellyfish bloom, July/August. Caused significant damage to gills.
Potential for whole site to be harvested.
Boat brought in to help with mortality disposal, being taken to Shetland.
Fresh water treatments concluded 14th of September. Fish took treatments fairly well considering poor gill health.
Lumpfish deployed to help with higher lice counts.
Mortality had reduced significantly in week 42, so far. But data for this week not complete.
Mortality ( last 4 weeks)
Week 41 - 2.26% - 10365 week 40 - 1.85% - 10304 week 39 - 1.07% - 6017 week 38 - 5.94% - 37008 [Original PDF]
Case Number: 2022-0096
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Remote inspection carried out on 19/04/2022 by supervised by . Site inspection carried out on 26/04/2022 by and . VMD samples taken by .
Site has its own ROV for net inspections. There are regular dive checks. Seal PRO nets are to be installed for next cycle.
Fish observed all shoaling as in normal behaviour and fish sampled for VMD appeared in healthy upon closer examination both externally and internally with no signs of disease.
Site currently passive grading and harvesting almost every second day.
During inspection, 2 fish in pen 7 were seen to have possible seal damage and were caught and humanely killed.
Site currently stocked with fish moved from Cheesebay (moved onto site between 02/02/022 - 19/03/22) due to fish welfare considerations and risk of biomass exceedance at their host site (Grey Horse Channel and Groatay). Muck was fallow for 17 days before Cheesebay fish arrived and will be fallow after Cheesebay stock are harvested in June until restocking at the end of August.
A seal was discovered in one pen on 22/10/2021, divers were called out same day and found a hole (122mm x 36mm) at a depth of 19m and repaired it. It was judged at the time that no escape or circumstances which gave rise to a significant risk of escape had occurred, therefore it was considered that the FHI was not required to be informed. Recommendations were made to review escapes reporting procedure including staff training, and a retrospective escapes notification has been submitted to the FHI.
Closing counts indicated that no escapes occurred as a result of this incident and the site now has double mesh nets on all pens along with seal blinds to aid containment. [Original PDF]
Case Number: 2024-0436
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Fish were moved on from Etive 6 in September (from DMA 15b to 15e). A RA for the SW to SW movement was available.
SRS has been identified on site (particularly liver lesions, rather than external lesions). Antibiotic treatment successfully completed end of October and bacterial load has lessoned. Jellyfish (Apolemia) on site are now the main cause of mortality.
Gill damage consistent with PGD but mild. HSMI has also been observed with blood clots around the heart noted. PCRs positive for HSMI, Teancibaculosis and Pisciricettsiosis. Fish have been vaccinated with Alphaject Micro6, PD1 and against
Yersinia and Pasteurella.
FW treatments since input with FLS have had good clearance rates.
Although site does not fall within a CoGP MA and so is not required to maintain a FMS, one has been created and was available for inspection. Fallow dates are synchronised on a single year class basis with the sites nearest neighbour, Rum
FS1317.
Several moribunds were observed in each of the cages, with more observed in cages 1, 2, 5 and 8. Five fish were removed from across the site for diagnostic sampling. The general population on site appeared in good body condition and were active in the cages with lots of jumping behaviour observed. Fish from cage 4 were removed for a lice count which was observed by the inspector. Very few lice were observed on these fish and they were in good physical condition with some minor damage to fins.
Site manager was informed that the cleanerfish at Etive were culled prior to transfer of salmon to Muck. However, the VHWP and RA stated that wrasse would be transferred with the salmon. Wrasse were observed across the site in several cages and this was raised with the site manager at the time of the inspection. The movement records were updated to include the transfer of cleanerfish to the site and the site manager was reminded that any mortalities must be recorded going forward.
Updated movement records including the transfer of wrasse to site were received 05/12/24. [Original PDF]