Olderbakken

Site 27876 · Sømna municipality · Production area 7, Nord-Trøndelag med Bindal

Below the lice limit, week 39Operated by Mowi Seawater Norway AS · group Mowi

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 5 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

1Wellboat visits in 2026by 1 vessel · latest 27 Aug 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	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	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

20240 of 7 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	0.21	0.5	Below the limit
2	0.19	0.5	Below the limit
3	0.16	0.5	Below the limit
4	0.17	0.5	Below the limit
5	0.21	0.5	Below the limit
6	0.20	0.5	Below the limit
7	0.18	0.5	Below the limit
8	unknown	0.5	Reported without a count
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	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

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	0.09	0.5	Below the limit
41	0.21	0.5	Below the limit
42	0.16	0.5	Below the limit
43	0.24	0.5	Below the limit
44	0.19	0.5	Below the limit
45	0.38	0.5	Below the limit
46	0.49	0.5	Near the limit
47	0.04	0.5	Below the limit
48	0.18	0.5	Below the limit
49	0.12	0.5	Below the limit
50	0.20	0.5	Below the limit
51	0.08	0.5	Below the limit
52	0.08	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 51, 2023
Thermal delousing2 pens
Week 47, 2023
Thermal delousing4 pens
Week 44, 2023
Mechanical delousing4 pens
Week 40, 2023
Mechanical delousing6 pens

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

1 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
27 Aug 2026	Faeroeysund	Helligvær Ø	5 h 23 min
13 Jul 2025	Ronja Heroy	Sandskjæret	53 min
03 Mar 2024	Ro North	Hestøy	2 h 44 min
29 Feb 2024	Ronja Havsoy	Hestøy	1 h 52 min
28 Feb 2024	Ro North	Hestøy	2 h 9 min
21 Feb 2024	Ro Sailor	Skauholmen	1 h 9 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
NT LA 0002	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
NT LA 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
NT LA 0005	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
NT LA 0006	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS

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