Otterholmen

Site 11738 · Alver municipality · Production area 4, Nordhordland til Stadt

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

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 4 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 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 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

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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	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	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

20251 of 49 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	0.18	0.5	Below the limit
3	0.24	0.5	Below the limit
4	0.02	0.5	Below the limit
5	0.00	0.5	Below the limit
6	0.02	0.5	Below the limit
7	0.04	0.5	Below the limit
8	0.12	0.5	Below the limit
9	0.24	0.5	Below the limit
10	0.32	0.5	Below the limit
11	0.44	0.5	Near the limit
12	0.04	0.5	Below the limit
13	0.02	0.5	Below the limit
14	0.00	0.5	Below the limit
15	0.08	0.5	Below the limit
16	0.08	0.2	Below the limit
17	0.03	0.2	Below the limit
18	0.08	0.2	Below the limit
19	0.17	0.2	Near the limit
20	0.06	0.2	Below the limit
21	0.03	0.2	Below the limit
22	0.10	0.5	Below the limit
23	0.16	0.5	Below the limit
24	0.08	0.5	Below the limit
25	0.42	0.5	Near the limit
26	0.04	0.5	Below the limit
27	0.06	0.5	Below the limit
28	0.04	0.5	Below the limit
29	0.06	0.5	Below the limit
30	0.22	0.5	Below the limit
31	0.40	0.5	Near the limit
32	0.03	0.5	Below the limit
33	0.20	0.5	Below the limit
34	0.37	0.5	Below the limit
35	0.44	0.5	Near the limit
36	0.02	0.5	Below the limit
37	0.30	0.5	Below the limit
38	0.28	0.5	Below the limit
39	0.44	0.5	Near the limit
40	1.06	0.5	Above the limit
41	0.20	0.5	Below the limit
42	0.35	0.5	Below the limit
43	0.15	0.5	Below the limit
44	0.45	0.5	Near the limit
45	0.10	0.5	Below the limit
46	0.03	0.5	Below the limit
47	0.15	0.5	Below the limit
48	0.10	0.5	Below the limit
49	0.30	0.5	Below the limit
50	unknown	0.5	Not reported
51	unknown	0.5	Not reported
52	unknown	0.5	Not reported

20240 of 25 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	0.28	0.5	Below the limit
2	0.12	0.5	Below the limit
3	0.08	0.5	Below the limit
4	0.03	0.5	Below the limit
5	0.05	0.5	Below the limit
6	0.00	0.5	Below the limit
7	0.03	0.5	Below the limit
8	0.10	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	0.2	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	0.00	0.5	Below the limit
37	0.00	0.5	Below the limit
38	0.00	0.5	Below the limit
39	0.17	0.5	Below the limit
40	0.03	0.5	Below the limit
41	0.07	0.5	Below the limit
42	0.20	0.5	Below the limit
43	0.30	0.5	Below the limit
44	0.20	0.5	Below the limit
45	0.02	0.5	Below the limit
46	0.08	0.5	Below the limit
47	0.10	0.5	Below the limit
48	0.36	0.5	Below the limit
49	0.20	0.5	Below the limit
50	0.06	0.5	Below the limit
51	0.08	0.5	Below the limit
52	0.04	0.5	Below the limit

20233 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	0.25	0.5	Below the limit
41	0.43	0.5	Near the limit
42	1.47	0.5	Above the limit
43	0.56	0.5	Above the limit
44	0.62	0.5	Above the limit
45	0.24	0.5	Below the limit
46	0.48	0.5	Near the limit
47	0.07	0.5	Below the limit
48	0.08	0.5	Below the limit
49	0.38	0.5	Below the limit
50	0.29	0.5	Below the limit
51	0.22	0.5	Below the limit
52	0.33	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 45, 2025
Thermal delousing3 pens
Week 41, 2025
Thermal delousing4 pens
Week 36, 2025
Thermal delousingWhole site
Week 32, 2025
Thermal delousing4 pens

Show all 16

Week 26, 2025
Thermal delousingWhole site
Week 19, 2025
Thermal delousingWhole site
Week 11, 2025
Thermal delousingWhole site
Week 3, 2025
Thermal delousingWhole site
Week 50, 2024
Thermal delousingWhole site
Week 45, 2024
Thermal delousing3 pens
Week 40, 2024
Thermal delousing2 pens
Week 2, 2024
Thermal delousing4 pens
Week 49, 2023
Thermal delousing1 pen
Week 45, 2023
Thermal delousing2 pens
Week 43, 2023
Thermal delousingWhole site
Week 42, 2023
Thermal delousingWhole site

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

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
12 Sep 2026	Mowi Star	Buholmen	5 h 23 min
02 Sep 2026	Mowi Star	Hyseneset	2 h 20 min
02 Sep 2026	Mowi Star	Hyseneset	36 min
01 Sep 2026	Seifjell	Torangskjeret	2 h 49 min
03 Nov 2025	Hordagut	Vadholmen	9 h 24 min
11 Oct 2025	Hordagut	Uføro disease or zone there	36 h 38 min
03 Sep 2025	Hordagut	Kjeppevikholmen	19 h 51 min
02 Sep 2025	Hordagut	Kjeppevikholmen	15 h 31 min
07 Aug 2025	Hordagut	Litle Lunnøy disease or zone there	21 h 10 min
06 Aug 2025	Hordagut	Litle Lunnøy disease or zone there	13 h 58 min
24 Jun 2025	Hordagut	Sagen 2	15 h 0 min
23 Jun 2025	Horda Pioneer	Toska S	33 h 20 min

Show 14 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
23 Jun 2025	Hordagut	Sagen 2	15 h 13 min
23 Jun 2025	Hordagut	Sagen 2	1 h 3 min
12 Mar 2025	Hordagut	Skipperdalsneset	13 h 51 min
11 Mar 2025	Hordagut	Skipperdalsneset	13 h 19 min
17 Jan 2025	Horda Pioneer	Lelandsholmen	29 h 30 min
10 Dec 2024	Horda Pioneer	Juvika B	21 h 24 min
05 Nov 2024	Horda Pioneer	Silda disease or zone there	16 h 9 min
29 Oct 2024	Mowi Star	Kalsøyflu	1 h 1 min
16 Oct 2024	Mowi Star	Litle Lunnøy	58 min
03 Oct 2024	Horda Pioneer	Hjartholmosen	8 h 4 min
14 Sep 2024	Mowi Star	Blom	40 min
01 Sep 2024	Mowi Star	Haugsnesvåg	35 min
09 Jan 2024	Hordagut	Øksneset	11 h 36 min
08 Jan 2024	Hordagut	Øksneset	14 h 42 min

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

Licences

Site MAB: 3,600 tonnes

Licence	Type	Capacity	Holder
H L 0019	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Blom Fiskeoppdrett AS
H ML 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Blom Fiskeoppdrett AS
H R 0004	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Blom Fiskeoppdrett AS
H R 0008	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Blom Fiskeoppdrett AS
H R 0011	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Blom Fiskeoppdrett AS
H ØN 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Blom Fiskeoppdrett AS
H ØN 0004	Kommersiell / matfiskSalmon, Rainbow trout, Trout	648 t	Blom Fiskeoppdrett AS

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