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Site 18898 · Osterøy municipality · Production area 4, Nordhordland til Stadt

Below the lice limit, week 39Operated by Sjøtroll Havbruk Sjø AS · group Lerøy Seafood Group

0.00Adult 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 11 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

4Wellboat visits in 2026by 2 different vessels · latest 04 Sep 2026Derived from AIS · Norwegian Coastal Administration (AIS) · updated 01 Oct 2026

1Escapes reported20 rainbow trout, April 2016Since 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	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	Reported without a count
29	0.00	0.5	Below the limit
30	0.00	0.5	Below the limit
31	0.00	0.5	Below the limit
32	0.00	0.5	Below the limit
33	0.00	0.5	Below the limit
34	0.00	0.5	Below the limit
35	0.00	0.5	Below the limit
36	0.00	0.5	Below the limit
37	0.00	0.5	Below the limit
38	0.00	0.5	Below the limit
39	0.00	0.5	Below the limit

Earlier years

20252 of 48 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	0.10	0.5	Below the limit
2	0.24	0.5	Below the limit
3	0.47	0.5	Near the limit
4	1.01	0.5	Above the limit
5	0.43	0.5	Near the limit
6	0.37	0.5	Below the limit
7	0.17	0.5	Below the limit
8	0.23	0.5	Below the limit
9	0.31	0.5	Below the limit
10	0.33	0.5	Below the limit
11	0.14	0.5	Below the limit
12	0.15	0.5	Below the limit
13	0.19	0.5	Below the limit
14	0.06	0.5	Below the limit
15	0.01	0.5	Below the limit
16	0.06	0.2	Below the limit
17	0.10	0.2	Below the limit
18	0.07	0.2	Below the limit
19	0.11	0.2	Below the limit
20	0.03	0.2	Below the limit
21	0.03	0.2	Below the limit
22	0.02	0.5	Below the limit
23	0.02	0.5	Below the limit
24	0.03	0.5	Below the limit
25	0.00	0.5	Below the limit
26	0.01	0.5	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	0.00	0.5	Below the limit
31	0.01	0.5	Below the limit
32	0.00	0.5	Below the limit
33	0.01	0.5	Below the limit
34	0.04	0.5	Below the limit
35	0.05	0.5	Below the limit
36	0.10	0.5	Below the limit
37	0.18	0.5	Below the limit
38	0.34	0.5	Below the limit
39	0.33	0.5	Below the limit
40	0.40	0.5	Near the limit
41	0.34	0.5	Below the limit
42	0.20	0.5	Below the limit
43	0.24	0.5	Below the limit
44	0.46	0.5	Near the limit
45	0.42	0.5	Near the limit
46	1.48	0.5	Above the limit
47	0.27	0.5	Below the limit
48	0.43	0.5	Near the limit
49	unknown	0.5	Not reported
50	unknown	0.5	Not reported
51	unknown	0.5	Not reported
52	unknown	0.5	Not reported

20240 of 22 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	0.2	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	Reported without a count
31	0.00	0.5	Below the limit
32	0.00	0.5	Below the limit
33	0.00	0.5	Below the limit
34	0.00	0.5	Below the limit
35	0.00	0.5	Below the limit
36	0.00	0.5	Below the limit
37	0.00	0.5	Below the limit
38	0.00	0.5	Below the limit
39	0.00	0.5	Below the limit
40	0.00	0.5	Below the limit
41	0.01	0.5	Below the limit
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	0.00	0.5	Below the limit
46	0.13	0.5	Below the limit
47	0.36	0.5	Below the limit
48	0.46	0.5	Near the limit
49	0.28	0.5	Below the limit
50	0.30	0.5	Below the limit
51	0.35	0.5	Below the limit
52	0.37	0.5	Below the limit

20230 of 6 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
10	0.26	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	0.19	0.5	Below the limit
41	0.28	0.5	Below the limit
42	0.07	0.5	Below the limit
43	0.32	0.5	Below the limit
44	0.13	0.5	Below the limit
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 47, 2025
Thermal delousing2 pens
Week 42, 2025
Thermal delousing4 pens
Week 20, 2025
Thermal delousing5 pens
Week 19, 2025
Thermal delousing2 pens

Show all 15

Week 14, 2025
Thermal delousing6 pens
Week 13, 2025
Thermal delousing1 pen
Week 11, 2025
Thermal delousing3 pens
Week 10, 2025
Thermal delousing4 pens
Week 7, 2025
Thermal delousing6 pens
Week 6, 2025
Thermal delousing1 pen
Week 5, 2025
Thermal delousing4 pens
Week 4, 2025
Thermal delousing2 pens
Week 1, 2025
Medicinal bath, Thermal delousing5 pens · Azamethiphos
Week 50, 2024
Thermal delousing3 pens
Week 49, 2024
Thermal 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

07 Apr 2016
20 rainbow trout escapedCause: Rist · recaptured 1 · Directorate of Fisheries

Wellboat visits

4 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
04 Sep 2026	Mowi Star	Buholmen	1 h 9 min
02 Aug 2026	Seifjell	Blom	1 h 7 min
21 Jul 2026	Mowi Star	Vikane	1 h 4 min
06 Jul 2026	Mowi Star	Fosså	53 min
12 Feb 2025	Seihav	Buholmen disease or zone there	4 h 23 min
10 Feb 2025	Seihav	Buholmen disease or zone there	45 h 29 min
09 Feb 2025	Seihav	Buholmen disease or zone there	12 h 30 min
28 Jan 2025	Seigrunn	Haugsnesvåg	5 h 37 min
28 Jan 2025	Seigrunn	Haugsnesvåg	2 h 7 min
27 Jan 2025	Seigrunn	Haugsnesvåg	5 h 11 min
27 Jan 2025	Seigrunn	Haugsnesvåg	5 h 57 min
26 Jan 2025	Seigrunn	Haugsnesvåg	6 h 21 min

Show 12 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
24 Jan 2025	Seigrunn	Haugsnesvåg	15 h 52 min
23 Jan 2025	Seigrunn	Haugsnesvåg	3 h 54 min
01 Jan 2025	Seihav	Blom	2 h 14 min
01 Jan 2025	Seihav	Blom	2 h 2 min
01 Jan 2025	Seihav	Blom	5 h 53 min
31 Dec 2024	Seihav	Blom	4 h 43 min
31 Dec 2024	Seihav	Blom	7 h 14 min
30 Dec 2024	Seihav	Blom	6 h 45 min
10 Oct 2024	Mowi Star	Krossholmen	1 h 7 min
09 Oct 2024	Mowi Star	Krossholmen	8 h 37 min
29 Jul 2024	Mowi Star	Hyseneset	1 h 1 min
22 Jul 2024	Mowi Star	Hyseneset	2 h 29 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
H OR 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Sjøtroll Havbruk Sjø AS
H OR 0005	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Sjøtroll Havbruk Sjø AS
H OR 0006	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Sjøtroll Havbruk Sjø AS
H OR 0007	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Sjøtroll Havbruk Sjø AS

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