Seiskjæret

Site 37857 · Herøy i Nordland municipality · Production area 8, Helgeland til Bodø

Below the lice limit, week 39Operated by Letsea AS · group unknown

0.18Adult 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 21 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

3Lice treatments in 2026Latest: Medicinal feed, week 28, 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

7Wellboat visits in 2026by 5 different vessels · latest 12 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 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	0.15	0.5	Below the limit
2	0.15	0.5	Below the limit
3	0.30	0.5	Below the limit
4	unknown	0.5	Reported without a count
5	unknown	0.5	Reported without a count
6	unknown	0.5	Reported without a count
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	0.5	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	0.00	0.2	Below the limit
23	0.00	0.2	Below the limit
24	0.00	0.2	Below the limit
25	0.00	0.2	Below the limit
26	0.01	0.2	Below the limit
27	0.01	0.5	Below the limit
28	0.05	0.5	Below the limit
29	0.02	0.5	Below the limit
30	0.02	0.5	Below the limit
31	0.03	0.5	Below the limit
32	0.03	0.5	Below the limit
33	0.07	0.5	Below the limit
34	0.04	0.5	Below the limit
35	0.11	0.5	Below the limit
36	0.10	0.5	Below the limit
37	0.15	0.5	Below the limit
38	0.15	0.5	Below the limit
39	0.18	0.5	Below the limit

Earlier years

20251 of 51 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	0.04	0.5	Below the limit
2	0.16	0.5	Below the limit
3	0.10	0.5	Below the limit
4	0.05	0.5	Below the limit
5	0.04	0.5	Below the limit
6	0.05	0.5	Below the limit
7	0.04	0.5	Below the limit
8	0.07	0.5	Below the limit
9	0.09	0.5	Below the limit
10	0.04	0.5	Below the limit
11	0.12	0.5	Below the limit
12	0.00	0.5	Below the limit
13	0.04	0.5	Below the limit
14	0.06	0.5	Below the limit
15	0.08	0.5	Below the limit
16	0.11	0.5	Below the limit
17	0.05	0.5	Below the limit
18	0.08	0.5	Below the limit
19	0.13	0.5	Below the limit
20	0.09	0.5	Below the limit
21	0.12	0.2	Below the limit
22	0.04	0.2	Below the limit
23	0.01	0.2	Below the limit
24	0.01	0.2	Below the limit
25	0.01	0.2	Below the limit
26	0.03	0.2	Below the limit
27	0.06	0.5	Below the limit
28	0.16	0.5	Below the limit
29	0.25	0.5	Below the limit
30	0.12	0.5	Below the limit
31	0.23	0.5	Below the limit
32	0.21	0.5	Below the limit
33	0.13	0.5	Below the limit
34	0.12	0.5	Below the limit
35	0.33	0.5	Below the limit
36	0.47	0.5	Near the limit
37	0.35	0.5	Below the limit
38	1.14	0.5	Above the limit
39	unknown	0.5	Not reported
40	0.08	0.5	Below the limit
41	0.16	0.5	Below the limit
42	0.45	0.5	Near the limit
43	0.44	0.5	Near the limit
44	0.17	0.5	Below the limit
45	0.43	0.5	Near the limit
46	0.40	0.5	Near the limit
47	0.32	0.5	Below the limit
48	0.00	0.5	Below the limit
49	0.13	0.5	Below the limit
50	0.08	0.5	Below the limit
51	0.10	0.5	Below the limit
52	0.07	0.5	Below 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
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	0.5	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	0.00	0.2	Below the limit
23	0.00	0.2	Below the limit
24	0.00	0.2	Below the limit
25	0.00	0.2	Below the limit
26	0.11	0.2	Below the limit
27	0.05	0.5	Below the limit
28	0.06	0.5	Below the limit
29	0.05	0.5	Below the limit
30	0.03	0.5	Below the limit
31	0.36	0.5	Below the limit
32	0.46	0.5	Near the limit
33	0.31	0.5	Below the limit
34	0.14	0.5	Below the limit
35	0.20	0.5	Below the limit
36	0.10	0.5	Below the limit
37	0.36	0.5	Below the limit
38	0.48	0.5	Near the limit
39	0.29	0.5	Below the limit
40	0.38	0.5	Below the limit
41	0.36	0.5	Below the limit
42	0.43	0.5	Near the limit
43	0.36	0.5	Below the limit
44	0.14	0.5	Below the limit
45	0.09	0.5	Below the limit
46	0.06	0.5	Below the limit
47	0.09	0.5	Below the limit
48	0.12	0.5	Below the limit
49	0.09	0.5	Below the limit
50	0.05	0.5	Below the limit
51	0.03	0.5	Below the limit
52	0.01	0.5	Below the limit

20230 of 1 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
36	0.37	0.5	Below the limit
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	unknown	0.5	Not reported
45	unknown	0.5	Not reported
46	unknown	0.5	Not reported
47	unknown	0.5	Not reported
48	unknown	0.5	Not reported
49	unknown	0.5	Not reported
50	unknown	0.5	Not reported
51	unknown	0.5	Not reported
52	unknown	0.5	Not reported

Treatments

Norwegian Food Safety Authority

Week 28, 2026
Medicinal feedWhole site · Emamectin-benzoat
Week 27, 2026
Medicinal feedWhole site · Emamectin-benzoat
Week 26, 2026
Medicinal feedWhole site · Emamectin-benzoat
Week 47, 2025
Thermal delousingWhole site

Show all 11

Week 44, 2025
Mechanical delousingWhole site
Week 37, 2025
Mechanical delousing3 pens
Week 29, 2025
Mechanical delousing3 pens
Week 21, 2025
Mechanical delousing6 pens
Week 44, 2024
Mechanical delousingWhole site
Week 37, 2024
Thermal delousingWhole site
Week 36, 2023
Mechanical delousing1 pen

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

7 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
12 Sep 2026	Robris	Sæterosen	1 h 47 min
12 Jun 2026	Viknatrans	Labukta	1 h 39 min
11 Jun 2026	Viknatrans	Labukta	1 h 0 min
20 May 2026	Ronja Havsoy	Langholmen	6 h 8 min
11 Feb 2026	Steinar Olaisen	Naustholmen	1 h 43 min
05 Feb 2026	Ronja Havsoy	Hestøy	2 h 21 min
18 Jan 2026	Inter Fjord	Naustholmen	4 h 33 min
22 Nov 2025	Faeroeysund	Hallsteinhamn I	15 h 18 min
26 Oct 2025	Ronja Havsoy	Hestøy	2 h 46 min
21 Oct 2025	Ronja Havsoy	Hestøy	2 h 23 min
12 Oct 2025	Inter Fjord	Marøya	2 h 46 min
06 Oct 2025	Faeroeysund	Renga S	1 h 29 min

Show 12 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
23 Sep 2025	Steinar Olaisen	Sundsøy	2 h 28 min
09 Sep 2025	Inter Fjord	Naustholmen	1 h 19 min
28 Aug 2025	Ro Sunrise	Storskjæret	3 h 4 min
19 Aug 2025	Inter Fjord	Skauholmen	3 h 18 min
12 Aug 2025	Steinar Olaisen	Djupvik	1 h 6 min
19 Jul 2025	Faeroeysund	Melkøya	2 h 1 min
13 Jul 2025	Faeroeysund	Naustholmen	3 h 0 min
06 Jul 2025	Faeroeysund	Skauholmen	2 h 10 min
22 May 2025	Steinar Olaisen	Skauholmen	47 h 29 min
03 Feb 2025	Faeroeysund	Hestøy	2 h 21 min
14 Sep 2024	Faeroeysund	Stangholmen	19 h 36 min
15 May 2024	Faeroeysund	Helligvær Ø	8 h 37 min

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

Licences

Site MAB: 3,599 tonnes

Licence	Type	Capacity	Holder
N AH 0041	Forskning / matfiskSalmon, Rainbow trout, Trout	780 t	Biomar A.s.
N AH 0042	Forskning / matfiskSalmon, Rainbow trout, Trout	780 t	Biomar A.s.
N AH 0043	Forskning / matfiskSalmon, Rainbow trout, Trout	780 t	Biomar A.s.
N AH 0048	Forskning / matfiskSalmon, Rainbow trout, Trout	780 t	Letsea AS
N AH 0049	Forskning / matfiskSalmon, Rainbow trout, Trout	780 t	Letsea AS
N DA 0036	Forskning / matfiskSalmon, Rainbow trout, Trout	780 t	Biomar A.s.
N DA 0077	Undervisning / matfiskSalmon, Rainbow trout, Trout	550 t	Nordland Fylkeskommune
N G 0066	Kommersiell / matfiskSalmon, Rainbow trout, Trout	375 t	Helgeland Laks AS
N G 0067	Kommersiell / matfiskSalmon, Rainbow trout, Trout	375 t	Helgeland Laks AS
N ME 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	3,482 t	Nova Sea Havbruk AS

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