Ystøya

Site 45003 · Alstahaug municipality · Production area 8, Helgeland til Bodø

Status unknown: not reported in week 39Operated by Letsea AS · group unknown

unknownAdult female lice per fishNo count in week 39. Latest: 0.44 in week 20, 2026Week 39, 2026 · Norwegian Food Safety Authority · updated 01 Oct 2026

0Weeks above the limit in 2026of 17 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

3Lice treatments in 2026Latest: Freshwater treatment, week 8, 20262026 · Norwegian Food Safety Authority · updated 01 Oct 2026

0Active disease casesNone active · 1 earlierRegister since 26 Nov 2024 · Norwegian Food Safety Authority · updated 01 Oct 2026

16Wellboat visits in 2026by 4 different vessels · latest 24 May 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

Show as table

Adult female lice per fish per week, 2026
Week	Adult female lice per fish	Lice limit	Status
1	unknown	0.5	Not reported
2	0.30	0.5	Below the limit
3	0.46	0.5	Near the limit
4	0.48	0.5	Near the limit
5	0.08	0.5	Below the limit
6	0.38	0.5	Below the limit
7	0.17	0.5	Below the limit
8	0.23	0.5	Below the limit
9	unknown	0.5	Not reported
10	0.10	0.5	Below the limit
11	unknown	0.5	Not reported
12	0.33	0.5	Below the limit
13	0.36	0.5	Below the limit
14	0.42	0.5	Near the limit
15	0.45	0.5	Near the limit
16	0.29	0.5	Below the limit
17	0.47	0.5	Near the limit
18	0.40	0.5	Near the limit
19	0.37	0.5	Below the limit
20	0.44	0.5	Near the limit
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

Earlier years

20252 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	0.00	0.5	Below the limit
2	0.00	0.5	Below the limit
3	0.00	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	0.00	0.5	Below the limit
8	0.00	0.5	Below the limit
9	0.00	0.5	Below the limit
10	0.00	0.5	Below the limit
11	0.01	0.5	Below the limit
12	0.00	0.5	Below the limit
13	0.00	0.5	Below the limit
14	0.00	0.5	Below the limit
15	0.01	0.5	Below the limit
16	0.02	0.5	Below the limit
17	0.00	0.5	Below the limit
18	0.00	0.5	Below the limit
19	0.01	0.5	Below the limit
20	0.06	0.5	Below the limit
21	0.06	0.2	Below the limit
22	0.04	0.2	Below the limit
23	0.06	0.2	Below the limit
24	0.01	0.2	Below the limit
25	0.05	0.2	Below the limit
26	0.06	0.2	Below the limit
27	0.03	0.5	Below the limit
28	0.02	0.5	Below the limit
29	0.09	0.5	Below the limit
30	0.21	0.5	Below the limit
31	0.47	0.5	Near the limit
32	0.08	0.5	Below the limit
33	0.24	0.5	Below the limit
34	0.24	0.5	Below the limit
35	0.09	0.5	Below the limit
36	0.38	0.5	Below the limit
37	0.81	0.5	Above the limit
38	0.14	0.5	Below the limit
39	0.45	0.5	Near the limit
40	0.43	0.5	Near the limit
41	0.12	0.5	Below the limit
42	0.49	0.5	Near the limit
43	0.63	0.5	Above the limit
44	0.06	0.5	Below the limit
45	0.17	0.5	Below the limit
46	0.24	0.5	Below the limit
47	0.24	0.5	Below the limit
48	0.29	0.5	Below the limit
49	0.46	0.5	Near the limit
50	0.47	0.5	Near the limit
51	0.05	0.5	Below the limit
52	0.27	0.5	Below the limit

20240 of 2 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	0.5	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	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	0.00	0.5	Below the limit
52	0.00	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

Show as table

Adult female lice per fish per week, 2023
Week	Adult female lice per fish	Lice limit	Status
36	0.16	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 8, 2026
Freshwater treatment, Thermal delousing4 pens
Week 5, 2026
Thermal delousing5 pens
Week 51, 2025
Thermal delousingWhole site
Week 43, 2025
Mechanical delousingWhole site

Show all 9

Week 41, 2025
Mechanical delousingWhole site
Week 38, 2025
Mechanical delousingWhole site
Week 35, 2025
Mechanical delousingWhole site
Week 32, 2025
Mechanical delousingWhole site
Week 15, 2025
Medicinal feedWhole site · Emamectin benzoat

Disease

Norwegian Food Safety Authority

24 Nov 2024
Pancreas disease (PD): closedSubtype SAV2 · started 19 Sep 2023 · Norwegian Food Safety Authority

Escapes

Directorate of Fisheries

No escapes reported from this site since 2006.

Wellboat visits

16 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
24 May 2026	Steinar Olaisen	Naustholmen	1 h 45 min
18 May 2026	Steinar Olaisen	Skarvhammaren	2 h 40 min
15 May 2026	Inter Fjord	Skauholmen	1 h 43 min
09 May 2026	Steinar Olaisen	Langskjæran	3 h 57 min
06 May 2026	Grotanger	Kariskjæret	4 h 24 min
23 Apr 2026	Grotanger	Skauholmen	3 h 7 min
22 Apr 2026	Grotanger	Myrlandshaug	3 h 37 min
20 Apr 2026	Steinar Olaisen	Hestøy	4 h 27 min
18 Apr 2026	Steinar Olaisen	Brennholmen	2 h 55 min
11 Apr 2026	Steinar Olaisen	Skauholmen	2 h 18 min
09 Apr 2026	Steinar Olaisen	Skauholmen	3 h 19 min
07 Mar 2026	Steinar Olaisen	Skauholmen	5 h 19 min

Show 9 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
14 Feb 2026	Faeroeysund	Hallsteinhamn I	13 h 19 min
01 Feb 2026	Faeroeysund	Brennholmen	7 h 43 min
30 Jan 2026	Faeroeysund	Brennholmen	37 h 13 min
26 Jan 2026	Steinar Olaisen	Kalvhylla	3 h 30 min
20 Dec 2025	Faeroeysund	Sjølyst	8 h 4 min
19 Dec 2025	Faeroeysund	Stangholmen	12 h 47 min
16 Sep 2025	Steinar Olaisen	Naustholmen	19 h 8 min
04 Aug 2025	Steinar Olaisen	Naustholmen	17 h 18 min
05 Dec 2024	Faeroeysund	Igerøy Ø	6 h 47 min

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

Licences

Site MAB: 3,120 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 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 R 0002	Kommersiell / matfiskSalmon, Rainbow trout, Trout	817 t	Selsøyvik Havbruk AS
N R 0013	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Selsøyvik Havbruk AS
N R 0048	Kommersiell / matfiskSalmon, Rainbow trout, Trout	101 t	Selsøyvik Havbruk AS
N R 0049	Kommersiell / matfiskSalmon, Rainbow trout, Trout	101 t	Selsøyvik Havbruk AS

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