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The Salmon Ledger
NOEN

Dyrholmen

Site 21415 · Stavanger municipality · Production area 2, Ryfylke

Below the lice limit, week 39Operated by Grieg Seafood Farming AS
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0.27Adult female lice per fishLimit 0.50 · below the limitWeek 39, 2026 · Norwegian Food Safety Authority · updated 01 Oct 2026
0Weeks above the limit in 2026of 18 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026
0Lice treatments in 2026None recorded2026 · Norwegian Food Safety Authority · updated 01 Oct 2026
0Active disease casesNone recordedRegister since 26 Nov 2024 · Norwegian Food Safety Authority · updated 01 Oct 2026
8Wellboat visits in 2026by 1 vessel · latest 04 Sep 2026Derived from AIS · Norwegian Coastal Administration (AIS) · updated 01 Oct 2026
0Escapes reportedNone reportedSince 2006 · Directorate of Fisheries · updated 01 Oct 2026

Sea lice against the limit

Weekly average of adult female lice per fish, as reported by the company. For this site the limit is 0.2 in weeks 16–21 and 0.5 for the rest of the year. Hatched weeks have no count and count neither as above nor below.

2026

Source: Norwegian Food Safety Authority, weekly lice counts reported by the companies · Limit: Regulation on sea lice control § 8 · Updated 01 Oct 2026
Show as table
Adult female lice per fish per week, 2026
WeekAdult female lice per fishLice limitStatus
10.330.5Below the limit
20.400.5Near the limit
30.450.5Near the limit
40.400.5Near the limit
50.400.5Near the limit
60.400.5Near the limit
70.300.5Below the limit
8unknown0.5Not reported
9unknown0.5Not reported
10unknown0.5Not reported
11unknown0.5Not reported
12unknown0.5Not reported
13unknown0.5Not reported
14unknown0.5Not reported
15unknown0.5Not reported
16unknown0.2Not reported
17unknown0.2Not reported
18unknown0.2Not reported
19unknown0.2Not reported
20unknown0.2Not reported
21unknown0.2Not reported
22unknown0.5Not reported
23unknown0.5Not reported
24unknown0.5Not reported
25unknown0.5Not reported
26unknown0.5Not reported
27unknown0.5Not reported
28unknown0.5Not reported
290.000.5Below the limit
300.000.5Below the limit
310.000.5Below the limit
320.000.5Below the limit
330.050.5Below the limit
340.130.5Below the limit
350.110.5Below the limit
360.070.5Below the limit
370.120.5Below the limit
380.290.5Below the limit
390.270.5Below the limit

Earlier years

20250 of 52 weeks with a count above the limit
Source: Norwegian Food Safety Authority, weekly lice counts reported by the companies · Limit: Regulation on sea lice control § 8 · Updated 01 Oct 2026
Show as table
Adult female lice per fish per week, 2025
WeekAdult female lice per fishLice limitStatus
10.300.5Below the limit
20.360.5Below the limit
30.360.5Below the limit
40.330.5Below the limit
50.370.5Below the limit
60.400.5Near the limit
70.390.5Below the limit
80.420.5Near the limit
90.390.5Below the limit
100.450.5Near the limit
110.430.5Near the limit
120.360.5Below the limit
130.360.5Below the limit
140.460.5Near the limit
150.220.5Below the limit
160.180.2Near the limit
170.070.2Below the limit
180.040.2Below the limit
190.080.2Below the limit
200.080.2Below the limit
210.110.2Below the limit
220.210.5Below the limit
230.420.5Near the limit
240.230.5Below the limit
250.140.5Below the limit
260.130.5Below the limit
270.290.5Below the limit
280.450.5Near the limit
290.200.5Below the limit
300.330.5Below the limit
310.170.5Below the limit
320.250.5Below the limit
330.480.5Near the limit
340.480.5Near the limit
350.400.5Near the limit
360.410.5Near the limit
370.430.5Near the limit
380.480.5Near the limit
390.360.5Below the limit
400.380.5Below the limit
410.400.5Near the limit
420.230.5Below the limit
430.460.5Near the limit
440.490.5Near the limit
450.350.5Below the limit
460.320.5Below the limit
470.270.5Below the limit
480.140.5Below the limit
490.170.5Below the limit
500.350.5Below the limit
510.300.5Below the limit
520.300.5Below the limit
20240 of 31 weeks with a count above the limit
Source: Norwegian Food Safety Authority, weekly lice counts reported by the companies · Limit: Regulation on sea lice control § 8 · Updated 01 Oct 2026
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Adult female lice per fish per week, 2024
WeekAdult female lice per fishLice limitStatus
10.440.5Near the limit
20.360.5Below the limit
30.310.5Below the limit
40.390.5Below the limit
50.390.5Below the limit
60.380.5Below the limit
70.380.5Below the limit
80.380.5Below the limit
90.480.5Near the limit
100.300.5Below the limit
11unknown0.5Not reported
12unknown0.5Not reported
13unknown0.5Not reported
14unknown0.5Not reported
15unknown0.5Not reported
16unknown0.2Not reported
17unknown0.2Not reported
18unknown0.2Not reported
19unknown0.2Not reported
20unknown0.2Not reported
21unknown0.2Not reported
22unknown0.5Not reported
23unknown0.5Not reported
24unknown0.5Not reported
25unknown0.5Not reported
26unknown0.5Not reported
27unknown0.5Not reported
28unknown0.5Not reported
29unknown0.5Not reported
30unknown0.5Not reported
31unknown0.5Not reported
320.000.5Below the limit
330.000.5Below the limit
340.000.5Below the limit
350.000.5Below the limit
360.010.5Below the limit
370.000.5Below the limit
380.000.5Below the limit
390.000.5Below the limit
400.030.5Below the limit
410.110.5Below the limit
420.180.5Below the limit
430.200.5Below the limit
440.350.5Below the limit
450.270.5Below the limit
460.290.5Below the limit
470.340.5Below the limit
480.380.5Below the limit
490.270.5Below the limit
500.140.5Below the limit
510.260.5Below the limit
520.310.5Below the limit
20230 of 12 weeks with a count above the limit (data from week 40)
Source: Norwegian Food Safety Authority, weekly lice counts reported by the companies · Limit: Regulation on sea lice control § 8 · Updated 01 Oct 2026
Show as table
Adult female lice per fish per week, 2023
WeekAdult female lice per fishLice limitStatus
400.480.5Near the limit
410.450.5Near the limit
420.490.5Near the limit
430.490.5Near the limit
440.040.5Below the limit
450.010.5Below the limit
46unknown0.5Reported without a count
470.040.5Below the limit
480.410.5Near the limit
490.410.5Near the limit
500.400.5Near the limit
510.410.5Near the limit
520.420.5Near the limit

Treatments

Norwegian Food Safety Authority
  • Week 45, 2025
    Mechanical delousing4 pens
  • Week 39, 2025
    Freshwater treatment1 pen
  • Week 38, 2025
    Freshwater treatment5 pens
  • Week 34, 2025
    Freshwater treatment, Mechanical delousing3 pens
Show all 11
  • Week 28, 2025
    Mechanical delousing8 pens
  • Week 24, 2025
    Freshwater treatment5 pens
  • Week 23, 2025
    Freshwater treatment2 pens
  • Week 16, 2025
    Freshwater treatment6 pens
  • Week 15, 2025
    Freshwater treatment5 pens
  • Week 44, 2023
    Medicinal bath4 pens · Andrelegemidler
  • Week 43, 2023
    Medicinal bath5 pens · Andrelegemidler

Disease

Norwegian Food Safety Authority

No cases in the Food Safety Authority's register of notifiable diseases (since 26 Nov 2024).

Escapes

Directorate of Fisheries

No escapes reported from this site since 2006.

Wellboat visits

8 visits in 2026

Visits are derived by us from the Coastal Administration's AIS positions: a fish carrier stationary within 500 metres of the farm for at least 30 minutes. The AIS archive lags about 17 days. A visit is not proof of infection.

ArrivalVesselPrevious farm (14 days)Duration
04 Sep 2026Ronja AzulTollaksholmen1 h 35 min
03 Sep 2026Ronja AzulTollaksholmen1 h 29 min
25 Aug 2026Ronja AzulOanes Sjø1 h 28 min
24 Aug 2026Ronja AzulOanes Sjø1 h 16 min
05 Feb 2026Ronja AzulPorsvika3 h 1 min
25 Jan 2026Ronja AzulHelgøy2 h 12 min
24 Jan 2026Ronja AzulHelgøy1 h 44 min
24 Jan 2026Ronja AzulKilaneset2 h 3 min
30 Nov 2025Ronja AzulTollaksholmen9 h 18 min
19 Nov 2025Ronja AzulHelgøy1 h 55 min
24 Oct 2025Ronja AzulHelgøy2 h 28 min
21 Oct 2025Ronja AzulRennaren2 h 35 min
Show 56 older visits
ArrivalVesselPrevious farm (14 days)Duration
23 Sep 2025Ronja AzulHelgøy19 h 31 min
22 Sep 2025Ronja AzulHelgøy11 h 17 min
20 Sep 2025Ronja AzulTollaksholmen34 h 19 min
20 Sep 2025Ronja AzulTollaksholmen6 h 0 min
19 Sep 2025Ronja AzulTollaksholmen8 h 17 min
19 Sep 2025Ronja AzulTollaksholmen4 h 39 min
18 Sep 2025Ronja AzulTollaksholmen17 h 41 min
17 Sep 2025Ronja AzulTollaksholmen3 h 2 min
31 Aug 2025Ronja AzulHelgøy3 h 10 min
24 Aug 2025Ronja AzulOanes Sjø4 h 5 min
23 Aug 2025Ronja AzulOanes Sjø17 h 11 min
22 Aug 2025Ronja AzulOanes Sjø3 h 52 min
19 Aug 2025Ronja SuperiorHelgøy56 min
18 Aug 2025Ronja SuperiorHelgøy1 h 30 min
08 Aug 2025Ronja SuperiorHelgøy1 h 2 min
08 Aug 2025Ronja SuperiorHesteneset1 h 53 min
04 Aug 2025Ronja QueenJørstadskjera6 h 23 min
31 Jul 2025Ronja AzulØklandsvågen1 h 21 min
13 Jul 2025Ronja SilverHåvikvågen S9 h 12 min
12 Jul 2025Ronja SilverHåvikvågen S19 h 39 min
11 Jul 2025Ronja SilverHåvikvågen S14 h 3 min
28 May 2025Ronja AzulHelgøy3 h 6 min
27 May 2025Ronja AzulHelgøy1 h 28 min
19 Apr 2025Ronja AzulTollaksholmen20 h 23 min
18 Apr 2025Ronja AzulTollaksholmen9 h 0 min
17 Apr 2025Ronja AzulTollaksholmen19 h 18 min
16 Apr 2025Ronja AzulTollaksholmen4 h 41 min
15 Apr 2025Ronja AzulTollaksholmen33 h 31 min
14 Apr 2025Ronja AzulTollaksholmen13 h 4 min
13 Apr 2025Ronja AzulTollaksholmen20 h 46 min
12 Apr 2025Ronja AzulTollaksholmen10 h 23 min
11 Apr 2025Ronja AzulTollaksholmen3 h 22 min
10 Apr 2025Ronja AzulTollaksholmen18 h 0 min
02 Nov 2024Ronja AzulHestholmen Ø5 h 51 min
18 Sep 2024Ronja MistralKrossholmen2 h 37 min
10 Sep 2024Ronja AzulKjeura1 h 38 min
10 Sep 2024Ronja AzulHelgøy1 h 32 min
05 Sep 2024Ronja AzulTollaksholmen1 h 4 min
05 Sep 2024Ronja AzulTollaksholmen1 h 11 min
04 Aug 2024Ronja MistralNordeimsøyna1 h 53 min
02 Aug 2024Ronja MistralTorangskjeret disease or zone there1 h 52 min
15 Mar 2024Ronja SilverHelgøy1 h 47 min
10 Mar 2024Ronja SilverHelgøy3 h 47 min
07 Mar 2024Ronja SilverHelgøy1 h 31 min
05 Mar 2024Ronja SilverHelgøy2 h 32 min
03 Mar 2024Ronja SilverHelgøy2 h 15 min
28 Feb 2024Ronja SilverHelgøy3 h 46 min
27 Feb 2024Ronja SilverHelgøy1 h 58 min
25 Feb 2024Ronja SilverHelgøy2 h 47 min
21 Feb 2024Ronja SilverHelgøy2 h 30 min
20 Feb 2024Ronja SilverHelgøy1 h 49 min
18 Feb 2024Ronja SilverHelgøy2 h 51 min
14 Feb 2024Norwegian GannetHillersvik3 h 29 min
06 Feb 2024Norwegian GannetAlmurden8 h 56 min
28 Jan 2024Norwegian GannetHillersvik6 h 35 min
21 Jan 2024Norwegian GannetRevøy3 h 21 min

Source: Norwegian Coastal Administration (AIS) · calculated by the Salmon Ledger · updated 01 Oct 2026

Who has reported

The companies that have submitted lice counts for this site, with the first and last week.

CompanyFromTo
Grieg Seafood Rogaland Sjø ASWeek 40, 2023Week 47, 2025
Cermaq Finnmark Farming ASWeek 50, 2024Week 50, 2024
Grieg Seafood Farming ASWeek 48, 2025Week 39, 2026

Source: Norwegian Food Safety Authority (organisation number on each lice report)

Licences

Site MAB: 5,140 tonnes
LicenceTypeCapacityHolder
R B 0001Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS
R B 0003Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS
R B 0005Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS
R B 0013Kommersiell / matfiskSalmon, Rainbow trout, Trout527 tGrieg Seafood Farming AS
R F 0002Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS
R R 0010Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS
R S 0001Forskning / matfiskSalmon, Rainbow trout, Trout780 tSkretting AS
R S 0002Forskning / matfiskSalmon, Rainbow trout, Trout780 tSkretting AS
R SD 0002Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS
R SD 0023Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS
R SS 0010Kommersiell / matfiskSalmon, Rainbow trout, Trout788 tGrieg Seafood Farming AS

Source: Directorate of Fisheries, aquaculture register · updated 01 Oct 2026