Istervika

Site 10876 · Brønnøy municipality · Production area 8, Helgeland til Bodø

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

0.17Adult 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 39 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

4Lice treatments in 2026Latest: Thermal delousing, week 37, 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

9Wellboat visits in 2026by 1 vessel · latest 08 Sep 2026Derived from AIS · Norwegian Coastal Administration (AIS) · updated 01 Oct 2026

1Escapes reported16 salmon, November 2017Since 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	0.00	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	0.00	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	0.01	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	0.00	0.5	Below the limit
16	0.00	0.5	Below the limit
17	0.00	0.5	Below the limit
18	0.00	0.5	Below the limit
19	0.00	0.5	Below the limit
20	0.00	0.5	Below the limit
21	0.00	0.2	Below the limit
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	0.01	0.2	Below the limit
26	0.01	0.2	Below the limit
27	0.02	0.5	Below the limit
28	0.01	0.5	Below the limit
29	0.02	0.5	Below the limit
30	0.03	0.5	Below the limit
31	0.03	0.5	Below the limit
32	0.04	0.5	Below the limit
33	0.10	0.5	Below the limit
34	0.16	0.5	Below the limit
35	0.18	0.5	Below the limit
36	0.31	0.5	Below the limit
37	0.02	0.5	Below the limit
38	0.09	0.5	Below the limit
39	0.17	0.5	Below the limit

Earlier years

20250 of 39 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	0.01	0.5	Below the limit
2	0.00	0.5	Below the limit
3	0.01	0.5	Below the limit
4	0.01	0.5	Below the limit
5	0.04	0.5	Below the limit
6	0.03	0.5	Below the limit
7	0.02	0.5	Below the limit
8	0.02	0.5	Below the limit
9	0.02	0.5	Below the limit
10	0.01	0.5	Below the limit
11	0.04	0.5	Below the limit
12	0.03	0.5	Below the limit
13	0.04	0.5	Below the limit
14	0.03	0.5	Below the limit
15	0.07	0.5	Below the limit
16	0.06	0.5	Below the limit
17	0.06	0.5	Below the limit
18	0.04	0.5	Below the limit
19	0.10	0.5	Below the limit
20	0.14	0.5	Below the limit
21	0.10	0.2	Below the limit
22	0.12	0.2	Below the limit
23	0.07	0.2	Below the limit
24	0.10	0.2	Below the limit
25	0.09	0.2	Below the limit
26	0.09	0.2	Below the limit
27	0.01	0.5	Below the limit
28	0.00	0.5	Below the limit
29	0.02	0.5	Below the limit
30	0.11	0.5	Below the limit
31	0.10	0.5	Below the limit
32	0.49	0.5	Near the limit
33	0.34	0.5	Below the limit
34	0.03	0.5	Below the limit
35	0.13	0.5	Below the limit
36	0.46	0.5	Near the limit
37	unknown	0.5	Reported without a count
38	unknown	0.5	Reported without a count
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	0.00	0.5	Below the limit
51	0.00	0.5	Below the limit
52	0.00	0.5	Below the limit

20240 of 20 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	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	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	0.01	0.5	Below the limit
40	0.00	0.5	Below the limit
41	0.00	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	0.01	0.5	Below the limit
46	0.02	0.5	Below the limit
47	0.02	0.5	Below the limit
48	0.01	0.5	Below the limit
49	0.02	0.5	Below the limit
50	0.02	0.5	Below the limit
51	0.02	0.5	Below the limit
52	0.02	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
40	0.27	0.5	Below the limit
41	0.30	0.5	Below the limit
42	0.38	0.5	Below the limit
43	0.37	0.5	Below the limit
44	0.38	0.5	Below the limit
45	0.00	0.5	Below the limit
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 37, 2026
Thermal delousingWhole site
Week 28, 2026
Thermal delousing2 pens
Week 6, 2026
Medicinal feed4 pens · Emamectin benzoat
Week 5, 2026
Medicinal feedWhole site · Emamectin benzoat

Show all 14

Week 37, 2025
Mechanical delousing1 pen
Week 34, 2025
Mechanical delousing3 pens
Week 33, 2025
Mechanical delousing5 pens
Week 30, 2025
Thermal delousing9 pens
Week 27, 2025
Mechanical delousingWhole site
Week 47, 2024
Medicinal feedWhole site · Emamectin benzoat
Week 46, 2024
Medicinal feedWhole site · Emamectin benzoat
Week 38, 2024
Medicinal feedWhole site · Emamectin benzoat
Week 37, 2024
Medicinal feedWhole site · Emamectin benzoat
Week 43, 2023
Mechanical delousing2 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

04 Nov 2017
16 salmon escapedCause: Ikke avklart · recaptured 1 · Directorate of Fisheries

Wellboat visits

9 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
08 Sep 2026	Ronja Boroy	Slåttvika	39 h 13 min
08 Sep 2026	Ronja Boroy	Slåttvika	19 h 28 min
08 Jul 2026	Ronja Boroy	Slåttvika	3 h 48 min
08 Jul 2026	Ronja Boroy	Slåttvika	5 h 14 min
08 Jul 2026	Ronja Boroy	Slåttvika	2 h 14 min
07 Jul 2026	Ronja Boroy	Slåttvika	5 h 47 min
07 Jul 2026	Ronja Boroy	Hestøy	4 h 22 min
06 Jul 2026	Ronja Boroy	Hestøy	6 h 16 min
06 Jul 2026	Ronja Boroy	Hestøy	3 h 38 min
15 Dec 2025	Ronja Havsoy	Mortenøy	8 h 44 min
14 Dec 2025	Ronja Havsoy	Mortenøy	12 h 6 min
12 Dec 2025	Ronja Havsoy	Mortenøy	6 h 42 min

Show 29 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
11 Dec 2025	Ronja Havsoy	Mortenøy	6 h 2 min
09 Dec 2025	Ronja Havsoy	Mortenøy	6 h 24 min
08 Dec 2025	Ronja Havsoy	Mortenøy	5 h 6 min
06 Dec 2025	Ronja Havsoy	Mortenøy	3 h 35 min
26 Sep 2025	Ro Spirit	Hestøy	1 h 24 min
22 Sep 2025	Ro Spirit	Hestøy	2 h 49 min
21 Sep 2025	Ro Spirit	Hestøy	50 min
16 Sep 2025	Ro Spirit	Hestøy	2 h 10 min
16 Sep 2025	Ro Spirit	Holmen	2 h 16 min
08 Sep 2025	Ro Spirit	Hestøy	2 h 47 min
08 Sep 2025	Ro Spirit	Holmen	3 h 4 min
18 Aug 2025	Ronja Heroy	Almurden	19 h 17 min
16 Aug 2025	Ronja Heroy	Almurden	27 h 22 min
15 Aug 2025	Ronja Heroy	Almurden	9 h 33 min
27 Jul 2025	Ronja Boroy	Bjørgan	28 h 8 min
26 Jul 2025	Ronja Boroy	Bjørgan	19 h 12 min
25 Jul 2025	Ronja Boroy	Bjørgan	20 h 5 min
04 Jul 2025	Ronja Heroy	Slåttvika	5 h 24 min
04 Jul 2025	Ronja Heroy	Slåttvika	6 h 43 min
03 Jul 2025	Ronja Heroy	Slåttvika	6 h 52 min
03 Jul 2025	Ronja Heroy	Slåttvika	6 h 41 min
02 Jul 2025	Ronja Heroy	Slåttvika	1 h 50 min
01 Jul 2025	Ronja Heroy	Slåttvika	28 h 25 min
01 Jul 2025	Ronja Heroy	Almurden	6 h 33 min
23 Sep 2024	Ronja Havsoy	Sæterosen	4 h 19 min
21 Sep 2024	Ronja Havsoy	Sæterosen	4 h 30 min
19 Sep 2024	Ronja Havsoy	Sæterosen	4 h 32 min
17 Sep 2024	Ronja Havsoy	Sæterosen	2 h 8 min
11 Aug 2024	Ronja Havsoy	Storelva	3 h 59 min

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

Licences

Site MAB: 4,680 tonnes

Licence	Type	Capacity	Holder
N AH 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
N BR 0002	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
N BR 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
N BR 0004	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
N BR 0017	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
N L 0010	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Mowi Seawater Norway AS
N ME 0005	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Nova Sea Havbruk AS
N ME 0028	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Nova Sea Havbruk AS
N R 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Nova Sea Havbruk AS
N R 0006	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Nova Sea Havbruk AS
N R 0008	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Nova Sea Havbruk AS
N R 0030	Kommersiell / matfiskSalmon, Rainbow trout, Trout	804 t	Nova Sea Havbruk AS

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