Skjerholmen N

Site 20115 · Øygarden municipality · Production area 3, Karmøy til Sotra

Status unknown: not reported in week 39Operated by Sjøtroll Havbruk Sjø AS · group Lerøy Seafood Group

unknownAdult female lice per fishNo count in week 39. Latest: 0.15 in week 16, 2026Week 39, 2026 · Norwegian Food Safety Authority · updated 01 Oct 2026

0Weeks above the limit in 2026of 16 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

1Lice treatments in 2026Latest: Freshwater treatment, week 4, 20262026 · Norwegian Food Safety Authority · updated 01 Oct 2026

0Active disease casesNone recordedRegister since 26 Nov 2024 · Norwegian Food Safety Authority · updated 01 Oct 2026

2Wellboat visits in 2026by 1 vessel · latest 26 Jan 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
Week	Adult female lice per fish	Lice limit	Status
1	0.11	0.5	Below the limit
2	0.29	0.5	Below the limit
3	0.43	0.5	Near the limit
4	0.28	0.5	Below the limit
5	0.35	0.5	Below the limit
6	0.02	0.5	Below the limit
7	0.02	0.5	Below the limit
8	0.03	0.5	Below the limit
9	0.02	0.5	Below the limit
10	0.04	0.5	Below the limit
11	0.03	0.5	Below the limit
12	0.04	0.5	Below the limit
13	0.04	0.5	Below the limit
14	0.07	0.5	Below the limit
15	0.18	0.5	Below the limit
16	0.15	0.2	Below the limit
17	unknown	0.2	Not reported
18	unknown	0.2	Not reported
19	unknown	0.2	Not reported
20	unknown	0.2	Not reported
21	unknown	0.2	Not reported
22	unknown	0.5	Not reported
23	unknown	0.5	Not reported
24	unknown	0.5	Not reported
25	unknown	0.5	Not reported
26	unknown	0.5	Not reported
27	unknown	0.5	Not reported
28	unknown	0.5	Not reported
29	unknown	0.5	Not reported
30	unknown	0.5	Not reported
31	unknown	0.5	Not reported
32	unknown	0.5	Not reported
33	unknown	0.5	Not reported
34	unknown	0.5	Not reported
35	unknown	0.5	Not reported
36	unknown	0.5	Not reported
37	unknown	0.5	Not reported
38	unknown	0.5	Not reported
39	unknown	0.5	Not reported

Earlier years

20257 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
Week	Adult female lice per fish	Lice limit	Status
1	0.11	0.5	Below the limit
2	0.12	0.5	Below the limit
3	0.14	0.5	Below the limit
4	0.23	0.5	Below the limit
5	0.30	0.5	Below the limit
6	0.35	0.5	Below the limit
7	0.40	0.5	Near the limit
8	0.45	0.5	Near the limit
9	0.22	0.5	Below the limit
10	0.27	0.5	Below the limit
11	0.07	0.5	Below the limit
12	0.10	0.5	Below the limit
13	0.04	0.5	Below the limit
14	0.05	0.5	Below the limit
15	0.06	0.5	Below the limit
16	0.08	0.2	Below the limit
17	0.10	0.2	Below the limit
18	0.14	0.2	Below the limit
19	0.18	0.2	Near the limit
20	0.16	0.2	Below the limit
21	0.17	0.2	Near the limit
22	0.18	0.5	Below the limit
23	0.17	0.5	Below the limit
24	0.17	0.5	Below the limit
25	0.18	0.5	Below the limit
26	0.22	0.5	Below the limit
27	0.30	0.5	Below the limit
28	0.49	0.5	Near the limit
29	0.64	0.5	Above the limit
30	0.46	0.5	Near the limit
31	0.39	0.5	Below the limit
32	0.44	0.5	Near the limit
33	0.24	0.5	Below the limit
34	0.54	0.5	Above the limit
35	1.13	0.5	Above the limit
36	0.25	0.5	Below the limit
37	0.11	0.5	Below the limit
38	0.07	0.5	Below the limit
39	0.29	0.5	Below the limit
40	0.69	0.5	Above the limit
41	1.02	0.5	Above the limit
42	0.29	0.5	Below the limit
43	0.10	0.5	Below the limit
44	0.13	0.5	Below the limit
45	0.17	0.5	Below the limit
46	0.40	0.5	Near the limit
47	0.70	0.5	Above the limit
48	1.10	0.5	Above the limit
49	0.28	0.5	Below the limit
50	0.05	0.5	Below the limit
51	0.08	0.5	Below the limit
52	0.09	0.5	Below the limit

20240 of 11 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, 2024
Week	Adult female lice per fish	Lice limit	Status
1	unknown	0.5	Not reported
2	unknown	0.5	Not reported
3	unknown	0.5	Not reported
4	unknown	0.5	Not reported
5	unknown	0.5	Not reported
6	unknown	0.5	Not reported
7	unknown	0.5	Not reported
8	unknown	0.5	Not reported
9	unknown	0.5	Not reported
10	unknown	0.5	Not reported
11	unknown	0.5	Not reported
12	unknown	0.5	Not reported
13	unknown	0.5	Not reported
14	unknown	0.5	Not reported
15	unknown	0.5	Not reported
16	unknown	0.2	Not reported
17	unknown	0.2	Not reported
18	unknown	0.2	Not reported
19	unknown	0.2	Not reported
20	unknown	0.2	Not reported
21	unknown	0.2	Not reported
22	unknown	0.5	Not reported
23	unknown	0.5	Not reported
24	unknown	0.5	Not reported
25	unknown	0.5	Not reported
26	unknown	0.5	Not reported
27	unknown	0.5	Not reported
28	unknown	0.5	Not reported
29	unknown	0.5	Not reported
30	unknown	0.5	Not reported
31	unknown	0.5	Not reported
32	unknown	0.5	Not reported
33	unknown	0.5	Not reported
34	unknown	0.5	Not reported
35	unknown	0.5	Not reported
36	unknown	0.5	Not reported
37	unknown	0.5	Not reported
38	unknown	0.5	Not reported
39	unknown	0.5	Not reported
40	unknown	0.5	Not reported
41	unknown	0.5	Not reported
42	0.00	0.5	Below the limit
43	0.00	0.5	Below the limit
44	0.00	0.5	Below the limit
45	0.01	0.5	Below the limit
46	0.02	0.5	Below the limit
47	0.06	0.5	Below the limit
48	0.08	0.5	Below the limit
49	0.11	0.5	Below the limit
50	0.06	0.5	Below the limit
51	0.08	0.5	Below the limit
52	0.07	0.5	Below the limit

20231 of 13 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
Week	Adult female lice per fish	Lice limit	Status
10	0.08	0.5	Below the limit
11	unknown	0.5	Not reported
12	unknown	0.5	Not reported
13	unknown	0.5	Not reported
14	unknown	0.5	Not reported
15	unknown	0.5	Not reported
16	unknown	0.2	Not reported
17	unknown	0.2	Not reported
18	unknown	0.2	Not reported
19	unknown	0.2	Not reported
20	unknown	0.2	Not reported
21	unknown	0.2	Not reported
22	unknown	0.5	Not reported
23	unknown	0.5	Not reported
24	unknown	0.5	Not reported
25	unknown	0.5	Not reported
26	unknown	0.5	Not reported
27	unknown	0.5	Not reported
28	unknown	0.5	Not reported
29	unknown	0.5	Not reported
30	unknown	0.5	Not reported
31	unknown	0.5	Not reported
32	unknown	0.5	Not reported
33	unknown	0.5	Not reported
34	unknown	0.5	Not reported
35	unknown	0.5	Not reported
36	unknown	0.5	Not reported
37	unknown	0.5	Not reported
38	unknown	0.5	Not reported
39	unknown	0.5	Not reported
40	0.04	0.5	Below the limit
41	0.04	0.5	Below the limit
42	0.13	0.5	Below the limit
43	0.08	0.5	Below the limit
44	0.30	0.5	Below the limit
45	0.23	0.5	Below the limit
46	0.20	0.5	Below the limit
47	0.43	0.5	Near the limit
48	0.55	0.5	Above the limit
49	0.40	0.5	Near the limit
50	0.40	0.5	Near the limit
51	0.40	0.5	Near the limit
52	unknown	0.5	Reported without a count

Treatments

Norwegian Food Safety Authority

Week 4, 2026
Thermal delousing, Freshwater treatment2 pens
Week 49, 2025
Thermal delousing, Freshwater treatmentWhole site
Week 42, 2025
Thermal delousing, Freshwater treatment8 pens
Week 37, 2025
Thermal delousing, Freshwater treatment2 pens

Show all 14

Week 36, 2025
Thermal delousing, Freshwater treatment4 pens
Week 35, 2025
Freshwater treatment, Thermal delousing4 pens
Week 30, 2025
Thermal delousing, Freshwater treatment4 pens
Week 29, 2025
Freshwater treatment, Thermal delousing4 pens
Week 23, 2025
Freshwater treatment, Thermal delousing4 pens
Week 20, 2025
Freshwater treatment, Thermal delousing2 pens
Week 13, 2025
Other treatment1 pen · Kombi - Ferskvann og Termisk
Week 11, 2025
Other treatment1 pen · Kombi - Ferskvann og Termisk
Week 10, 2025
Freshwater treatment, Thermal delousing4 pens
Week 9, 2025
Thermal delousing, Freshwater treatment6 pens

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

2 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.

Arrival	Vessel	Previous farm (14 days)	Duration
26 Jan 2026	Seihav	Sagen 2	1 h 9 min
25 Jan 2026	Seihav	Sagen 2	18 h 16 min
06 Dec 2025	Seigrunn	Sagen 2	20 h 2 min
05 Dec 2025	Seigrunn	Sagen 2	19 h 8 min
04 Dec 2025	Seigrunn	Sagen 2	12 h 0 min
16 Oct 2025	Seigrunn	Sagen 2	15 h 13 min
02 Sep 2025	Seihav	Ramsøy S	2 h 8 min
02 Sep 2025	Seihav	Ramsøy S	12 h 39 min
01 Sep 2025	Seihav	Ramsøy S	20 h 31 min
31 Aug 2025	Seihav	Ramsøy S	11 h 12 min
30 Aug 2025	Seihav	Ramsøy S	15 h 35 min
26 Jul 2025	Seihav	Kyrholmen S disease or zone there	18 h 57 min

Show 17 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
25 Jul 2025	Seihav	Kyrholmen S disease or zone there	6 h 48 min
19 Jul 2025	Seigrunn	Sagen 2	33 h 24 min
18 Jul 2025	Seigrunn	Sagen 2	21 h 1 min
16 May 2025	Seigrunn	Grimsholmen	13 h 45 min
02 May 2025	Tonny	Buarøy	1 h 23 min
10 Mar 2025	Seihav	Kyrholmen S	13 h 20 min
03 Mar 2025	Seihav	Buarøy	1 h 48 min
02 Mar 2025	Seihav	Buarøy	15 h 9 min
01 Mar 2025	Seihav	Buarøy	18 h 30 min
28 Feb 2025	Seihav	Buarøy	20 h 22 min
27 Feb 2025	Seihav	Buarøy	8 h 50 min
13 Dec 2024	Mowi Star	Flatøyflu	8 h 34 min
12 Dec 2024	Mowi Star	Flatøyflu	8 h 17 min
11 Dec 2024	Mowi Star	Flatøyflu	7 h 55 min
13 Oct 2024	Seifjell	Haugsnesvåg	2 h 41 min
12 Oct 2024	Seifjell	Haugsnesvåg	9 h 18 min
10 Oct 2024	Seifjell	Haugsnesvåg	13 h 46 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.

Company	From	To
Sjøtroll Havbruk Sjø AS	Week 10, 2023	Week 16, 2026
Lerøy Vest Sjø AS	Week 37, 2025	Week 37, 2025

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

Licences

Site MAB: 3,120 tonnes

Licence	Type	Capacity	Holder
H B 0023	Kommersiell / matfiskSalmon, Rainbow trout, Trout	689 t	Sjøtroll Havbruk Sjø AS
H FJ 0008	Kommersiell / matfiskSalmon, Rainbow trout, Trout	689 t	Sjøtroll Havbruk Sjø AS
H S 0002	Kommersiell / matfiskSalmon, Rainbow trout, Trout	689 t	Sjøtroll Havbruk Sjø AS
H S 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	689 t	Sjøtroll Havbruk Sjø AS
H S 0004	Kommersiell / matfiskSalmon, Rainbow trout, Trout	689 t	Sjøtroll Havbruk Sjø AS
H S 0014	Kommersiell / matfiskSalmon, Rainbow trout, Trout	689 t	Sjøtroll Havbruk Sjø AS

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