Langholmen N

Site 34637 · Hadsel municipality · Production area 9, Vestfjorden og Vesterålen

Below the lice limit, week 39Operated by Holmøy Havbruk AS

0.04Adult 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 39 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

2Lice treatments in 2026Latest: Mechanical delousing, week 38, 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

0Wellboat visits in 2026Latest visit 03 Nov 2025Derived 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 21–26 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

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Adult female lice per fish per week, 2026
Week	Adult female lice per fish	Lice limit	Status
1	0.01	0.5	Below the limit
2	0.00	0.5	Below the limit
3	0.02	0.5	Below the limit
4	0.00	0.5	Below the limit
5	0.01	0.5	Below the limit
6	0.00	0.5	Below the limit
7	0.01	0.5	Below the limit
8	0.00	0.5	Below the limit
9	0.03	0.5	Below the limit
10	0.02	0.5	Below the limit
11	0.06	0.5	Below the limit
12	0.00	0.5	Below the limit
13	0.05	0.5	Below the limit
14	0.05	0.5	Below the limit
15	0.01	0.5	Below the limit
16	0.03	0.5	Below the limit
17	0.04	0.5	Below the limit
18	0.07	0.5	Below the limit
19	0.00	0.5	Below the limit
20	0.00	0.5	Below the limit
21	0.01	0.2	Below the limit
22	0.01	0.2	Below the limit
23	0.02	0.2	Below the limit
24	0.00	0.2	Below the limit
25	0.04	0.2	Below the limit
26	0.02	0.2	Below the limit
27	0.00	0.5	Below the limit
28	0.00	0.5	Below the limit
29	0.00	0.5	Below the limit
30	0.01	0.5	Below the limit
31	0.01	0.5	Below the limit
32	0.04	0.5	Below the limit
33	0.24	0.5	Below the limit
34	0.23	0.5	Below the limit
35	0.18	0.5	Below the limit
36	0.25	0.5	Below the limit
37	0.31	0.5	Below the limit
38	0.08	0.5	Below the limit
39	0.04	0.5	Below the limit

Earlier years

20250 of 17 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, 2025
Week	Adult female lice per fish	Lice limit	Status
1	0.17	0.5	Below the limit
2	0.13	0.5	Below the limit
3	0.40	0.5	Near the limit
4	0.00	0.5	Below the limit
5	0.05	0.5	Below the limit
6	0.05	0.5	Below the limit
7	0.05	0.5	Below the limit
8	0.05	0.5	Below the limit
9	unknown	0.5	Reported without a count
10	unknown	0.5	Reported without a count
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	0.5	Not reported
17	unknown	0.5	Not reported
18	unknown	0.5	Not reported
19	unknown	0.5	Not reported
20	unknown	0.5	Not reported
21	unknown	0.2	Not reported
22	unknown	0.2	Not reported
23	unknown	0.2	Not reported
24	unknown	0.2	Not reported
25	unknown	0.2	Not reported
26	unknown	0.2	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	unknown	0.5	Not reported
43	unknown	0.5	Not reported
44	0.00	0.5	Below the limit
45	0.00	0.5	Below the limit
46	0.00	0.5	Below the limit
47	0.00	0.5	Below the limit
48	0.00	0.5	Below the limit
49	0.00	0.5	Below the limit
50	0.01	0.5	Below the limit
51	0.00	0.5	Below the limit
52	0.00	0.5	Below the limit

20241 of 47 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
Week	Adult female lice per fish	Lice limit	Status
1	0.16	0.5	Below the limit
2	0.23	0.5	Below the limit
3	0.19	0.5	Below the limit
4	unknown	0.5	Reported without a count
5	0.22	0.5	Below the limit
6	unknown	0.5	Reported without a count
7	0.27	0.5	Below the limit
8	unknown	0.5	Reported without a count
9	0.34	0.5	Below the limit
10	unknown	0.5	Reported without a count
11	0.25	0.5	Below the limit
12	unknown	0.5	Reported without a count
13	0.14	0.5	Below the limit
14	0.15	0.5	Below the limit
15	0.18	0.5	Below the limit
16	0.06	0.5	Below the limit
17	0.20	0.5	Below the limit
18	0.13	0.5	Below the limit
19	0.04	0.5	Below the limit
20	0.14	0.5	Below the limit
21	0.10	0.2	Below the limit
22	0.04	0.2	Below the limit
23	0.04	0.2	Below the limit
24	0.05	0.2	Below the limit
25	0.09	0.2	Below the limit
26	0.14	0.2	Below the limit
27	0.13	0.5	Below the limit
28	0.24	0.5	Below the limit
29	0.02	0.5	Below the limit
30	0.29	0.5	Below the limit
31	0.18	0.5	Below the limit
32	0.41	0.5	Near the limit
33	0.05	0.5	Below the limit
34	0.17	0.5	Below the limit
35	0.21	0.5	Below the limit
36	0.99	0.5	Above the limit
37	0.35	0.5	Below the limit
38	0.29	0.5	Below the limit
39	0.24	0.5	Below the limit
40	0.33	0.5	Below the limit
41	0.49	0.5	Near the limit
42	0.22	0.5	Below the limit
43	0.33	0.5	Below the limit
44	0.27	0.5	Below the limit
45	0.32	0.5	Below the limit
46	0.14	0.5	Below the limit
47	0.11	0.5	Below the limit
48	0.16	0.5	Below the limit
49	0.18	0.5	Below the limit
50	0.05	0.5	Below the limit
51	0.12	0.5	Below the limit
52	0.15	0.5	Below the limit

20230 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

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Adult female lice per fish per week, 2023
Week	Adult female lice per fish	Lice limit	Status
40	0.04	0.5	Below the limit
41	0.05	0.5	Below the limit
42	0.00	0.5	Below the limit
43	0.10	0.5	Below the limit
44	0.13	0.5	Below the limit
45	0.14	0.5	Below the limit
46	0.17	0.5	Below the limit
47	0.21	0.5	Below the limit
48	0.13	0.5	Below the limit
49	0.10	0.5	Below the limit
50	0.16	0.5	Below the limit
51	0.16	0.5	Below the limit
52	0.13	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 38, 2026
Mechanical delousingWhole site
Week 21, 2026
Medicinal feedWhole site · Emamectin benzoat
Week 46, 2024
Thermal delousingWhole site
Week 42, 2024
Medicinal bath6 pens · Azamethiphos

Show all 8

Week 37, 2024
Thermal delousingWhole site
Week 34, 2024
Thermal delousingWhole site
Week 29, 2024
Thermal delousingWhole site
Week 40, 2023
Medicinal feed4 pens · Emamectin benzoat

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

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
03 Nov 2025	Ro Chief	Daljorda	2 h 2 min
28 Oct 2025	Ro Master	Solheim	58 min
08 Mar 2025	Ro Sailor	Holmen	51 min
05 Mar 2025	Ro Sailor	Hestøy	1 h 53 min
03 Feb 2025	Ro Sailor	Skauholmen	2 h 6 min
29 Jan 2025	Ro Sailor	Skjervøy V	2 h 35 min
27 Jan 2025	Ro Sailor	Holmen	2 h 4 min
25 Jan 2025	Ro Sailor	Skauholmen	1 h 58 min
06 Jan 2025	Ro Spirit	Holmen	1 h 26 min
05 Jan 2025	Ro Spirit	Holmen	2 h 25 min
01 Jan 2025	Ro Spirit	Holmen	1 h 41 min
29 Dec 2024	Ro Spirit	Angstauren	1 h 14 min

Show 14 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
08 Dec 2024	Skrova	Hallvardsøya	1 h 32 min
11 Nov 2024	Ro Venture	Holmen	21 h 21 min
09 Nov 2024	Ro Sailor	Holmen	3 h 14 min
07 Nov 2024	Ro Arctic	Hellarvika	2 h 16 min
07 Nov 2024	Ro Arctic	Hellarvika	16 h 17 min
20 Oct 2024	Ro Spirit	Gisløy Nø	2 h 19 min
13 Oct 2024	Ro Spirit	Holmen	1 h 50 min
15 Sep 2024	Ro Arctic	Trolløya SV	7 h 58 min
10 Sep 2024	Ro Arctic	Bremnesøya	34 h 13 min
20 Aug 2024	Ro Arctic	Sjåneset	16 h 7 min
18 Aug 2024	Ro Arctic	Sjåneset	27 h 53 min
17 Aug 2024	Ro Sailor	Holmen	2 h 24 min
17 Jul 2024	Ro Arctic	Trolløya SV	20 h 7 min
16 Jul 2024	Ro Arctic	Trolløya SV	11 h 23 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
Eidsfjord Sjøfarm AS	Week 40, 2023	Week 43, 2023
Holmøy Havbruk AS	Week 44, 2023	Week 39, 2026

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

Licences

Site MAB: 4,680 tonnes

Licence	Type	Capacity	Holder
N H 0020	Kommersiell / matfiskSalmon, Rainbow trout, Trout	1,003 t	Holmøy Havbruk AS
N H 0032	Undervisning / matfiskSalmon, Rainbow trout, Trout	780 t	Nordland Fylkeskommune
N SO 0029	Kommersiell / matfiskSalmon, Rainbow trout, Trout	1,066 t	Holmøy Havbruk AS
N VV 0007	Kommersiell / matfiskSalmon, Rainbow trout, Trout	1,003 t	Holmøy Havbruk AS
N Ø 0006	Kommersiell / matfiskSalmon, Rainbow trout, Trout	1,005 t	Holmøy Havbruk AS

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