Rønstad

Site 12209 · Volda municipality · Production area 5, Stadt til Hustadvika

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

9Lice treatments in 2026Latest: Mechanical delousing, week 39, 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

22Wellboat visits in 2026by 3 different vessels · latest 06 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 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	0.06	0.5	Below the limit
2	0.08	0.5	Below the limit
3	0.06	0.5	Below the limit
4	0.14	0.5	Below the limit
5	0.22	0.5	Below the limit
6	0.18	0.5	Below the limit
7	0.02	0.5	Below the limit
8	0.01	0.5	Below the limit
9	0.04	0.5	Below the limit
10	0.01	0.5	Below the limit
11	0.04	0.5	Below the limit
12	0.08	0.5	Below the limit
13	0.07	0.5	Below the limit
14	0.12	0.5	Below the limit
15	0.09	0.5	Below the limit
16	0.16	0.2	Below the limit
17	0.04	0.2	Below the limit
18	0.03	0.2	Below the limit
19	0.04	0.2	Below the limit
20	0.06	0.2	Below the limit
21	0.05	0.2	Below the limit
22	0.17	0.5	Below the limit
23	0.23	0.5	Below the limit
24	0.38	0.5	Below the limit
25	0.19	0.5	Below the limit
26	0.19	0.5	Below the limit
27	0.28	0.5	Below the limit
28	0.29	0.5	Below the limit
29	0.08	0.5	Below the limit
30	0.11	0.5	Below the limit
31	0.42	0.5	Near the limit
32	0.11	0.5	Below the limit
33	0.24	0.5	Below the limit
34	0.09	0.5	Below the limit
35	0.10	0.5	Below the limit
36	0.21	0.5	Below the limit
37	0.31	0.5	Below the limit
38	0.16	0.5	Below the limit
39	0.17	0.5	Below the limit

Earlier years

20250 of 30 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	0.43	0.5	Near the limit
2	0.44	0.5	Near the limit
3	0.27	0.5	Below the limit
4	0.06	0.5	Below the limit
5	0.01	0.5	Below the limit
6	0.01	0.5	Below the limit
7	0.09	0.5	Below the limit
8	0.16	0.5	Below the limit
9	0.12	0.5	Below the limit
10	0.17	0.5	Below the limit
11	0.13	0.5	Below the limit
12	0.14	0.5	Below the limit
13	0.13	0.5	Below the limit
14	0.14	0.5	Below the limit
15	0.14	0.5	Below the limit
16	0.17	0.2	Near the limit
17	0.03	0.2	Below the limit
18	0.05	0.2	Below the limit
19	0.06	0.2	Below the limit
20	0.06	0.2	Below the limit
21	0.14	0.2	Below the limit
22	0.25	0.5	Below the limit
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	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	0.00	0.5	Below the limit
46	0.00	0.5	Below the limit
47	0.00	0.5	Below the limit
48	0.00	0.5	Below the limit
49	0.00	0.5	Below the limit
50	0.06	0.5	Below the limit
51	0.05	0.5	Below the limit
52	0.09	0.5	Below the limit

20240 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, 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	0.00	0.5	Below the limit
15	0.00	0.5	Below the limit
16	0.00	0.2	Below the limit
17	0.00	0.2	Below the limit
18	0.00	0.2	Below the limit
19	0.00	0.2	Below the limit
20	0.00	0.2	Below the limit
21	0.00	0.2	Below the limit
22	0.00	0.5	Below the limit
23	0.00	0.5	Below the limit
24	0.00	0.5	Below the limit
25	0.00	0.5	Below the limit
26	0.01	0.5	Below the limit
27	0.03	0.5	Below the limit
28	0.44	0.5	Near the limit
29	0.25	0.5	Below the limit
30	0.07	0.5	Below the limit
31	0.13	0.5	Below the limit
32	0.23	0.5	Below the limit
33	0.06	0.5	Below the limit
34	0.17	0.5	Below the limit
35	0.17	0.5	Below the limit
36	0.17	0.5	Below the limit
37	0.16	0.5	Below the limit
38	0.31	0.5	Below the limit
39	0.20	0.5	Below the limit
40	0.32	0.5	Below the limit
41	0.27	0.5	Below the limit
42	0.27	0.5	Below the limit
43	0.22	0.5	Below the limit
44	0.18	0.5	Below the limit
45	0.12	0.5	Below the limit
46	0.27	0.5	Below the limit
47	0.38	0.5	Below the limit
48	0.41	0.5	Near the limit
49	0.46	0.5	Near the limit
50	0.14	0.5	Below the limit
51	0.23	0.5	Below the limit
52	0.33	0.5	Below the limit

20230 of 10 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	0.39	0.5	Below the limit
41	0.41	0.5	Near the limit
42	0.45	0.5	Near the limit
43	0.23	0.5	Below the limit
44	0.18	0.5	Below the limit
45	0.23	0.5	Below the limit
46	0.25	0.5	Below the limit
47	0.28	0.5	Below the limit
48	0.38	0.5	Below the limit
49	0.43	0.5	Near the limit
50	unknown	0.5	Reported without a count
51	unknown	0.5	Not reported
52	unknown	0.5	Not reported

Treatments

Norwegian Food Safety Authority

Week 39, 2026
Mechanical delousing3 pens
Week 38, 2026
Mechanical delousing4 pens
Week 34, 2026
Mechanical delousingWhole site
Week 32, 2026
Thermal delousingWhole site

Show all 32

Week 29, 2026
Thermal delousing4 pens
Week 28, 2026
Thermal delousing2 pens
Week 25, 2026
Mechanical delousingWhole site
Week 17, 2026
Thermal delousingWhole site
Week 7, 2026
Thermal delousingWhole site
Week 49, 2025
Medicinal feedWhole site · Emamectin benzoat
Week 48, 2025
Medicinal feedWhole site · Emamectin benzoat
Week 16, 2025
Thermal delousingWhole site
Week 12, 2025
Mechanical delousing4 pens
Week 4, 2025
Thermal delousing2 pens
Week 3, 2025
Thermal delousing3 pens
Week 2, 2025
Thermal delousing2 pens
Week 50, 2024
Mechanical delousingWhole site
Week 45, 2024
Mechanical delousingWhole site
Week 42, 2024
Mechanical delousingWhole site
Week 40, 2024
Thermal delousingWhole site
Week 39, 2024
Thermal delousing2 pens
Week 38, 2024
Thermal delousing5 pens
Week 36, 2024
Thermal delousingWhole site
Week 33, 2024
Thermal delousing6 pens
Week 30, 2024
Thermal delousing1 pen
Week 29, 2024
Thermal delousing6 pens
Week 22, 2024
Medicinal feedWhole site · Diflubenzuron
Week 21, 2024
Medicinal feedWhole site · Diflubenzuron
Week 20, 2024
Medicinal feedWhole site · Diflubenzuron
Week 43, 2023
Mechanical delousing5 pens
Week 41, 2023
Mechanical delousing2 pens
Week 40, 2023
Mechanical delousing4 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

22 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
06 Aug 2026	Ro West	Storvika	18 h 11 min
04 Aug 2026	Ro West	Storvika	38 h 15 min
14 Jul 2026	Ro West	Voravika	12 h 44 min
14 Jul 2026	Froy Jarl	Voravika	4 h 19 min
13 Jul 2026	Froy Jarl	Voravika	13 h 16 min
13 Jul 2026	Ro West	Voravika	18 h 41 min
13 Jul 2026	Ro West	Voravika	34 min
12 Jul 2026	Froy Jarl	Voravika	12 h 59 min
12 Jul 2026	Ro West	Voravika	10 h 59 min
11 Jul 2026	Ro West	Voravika	5 h 41 min
11 Jul 2026	Ro West	Voravika	2 h 51 min
11 Jul 2026	Froy Jarl	Voravika	19 h 6 min

Show 41 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
24 Apr 2026	Froy Jarl	Hjartholm	51 min
24 Apr 2026	Froy Jarl	Hjartholm	14 h 23 min
23 Apr 2026	Froy Jarl	Hjartholm	15 h 49 min
21 Apr 2026	Freyja	Tveit	9 h 12 min
20 Apr 2026	Freyja	Tveit	12 h 49 min
13 Feb 2026	Ro West	Sandvika	11 h 40 min
12 Feb 2026	Freyja	Sandvika	31 min
12 Feb 2026	Ro West	Sandvika	2 h 56 min
11 Feb 2026	Ro West	Sandvika	20 h 9 min
11 Feb 2026	Freyja	Sandvika	36 h 21 min
03 Nov 2025	Ronja Evolution	Skorpeosen	1 h 40 min
29 May 2025	Ro Fjord	Rindarøy	1 h 6 min
29 May 2025	Ro Fjord	Rindarøy	1 h 7 min
20 Apr 2025	Ro West	Holmskallen	3 h 52 min
18 Apr 2025	Ro West	Holmskallen	39 h 36 min
26 Mar 2025	Ro Fjord	Beitveit	1 h 16 min
25 Mar 2025	Ro Fjord	Beitveit	1 h 7 min
24 Mar 2025	Ro Fjord	Beitveit	1 h 29 min
26 Feb 2025	Ro Fjord	Eggesbønes	1 h 37 min
05 Feb 2025	Ro Fjord	Eggesbønes	1 h 0 min
21 Jan 2025	Ro West	Holmskallen	30 h 38 min
20 Jan 2025	Ro West	Holmskallen	9 h 18 min
19 Jan 2025	Ro West	Holmskallen	11 h 6 min
18 Jan 2025	Ro West	Holmskallen	20 h 33 min
17 Jan 2025	Ro West	Holmskallen	1 h 51 min
06 Jan 2025	Ro West	Storvika	17 h 52 min
04 Oct 2024	Ronja Boroy	Bjørlykkestranda	46 h 48 min
23 Sep 2024	Horda Pioneer	Silda disease or zone there	6 h 28 min
21 Sep 2024	Horda Pioneer	Silda disease or zone there	31 h 25 min
05 Sep 2024	Ronja Boroy	Sandvika	44 h 22 min
16 Aug 2024	Ro West	Holmskallen	30 h 30 min
23 Jul 2024	Ro West	Marøy Nø	11 h 13 min
22 Jul 2024	Ro West	Marøy Nø	12 h 42 min
21 Jul 2024	Ro West	Marøy Nø	7 h 53 min
20 Jul 2024	Ro West	Marøy Nø	21 h 50 min
19 Jul 2024	Ro West	Marøy Nø	10 h 34 min
18 Jul 2024	Ro West	Marøy Nø	11 h 17 min
08 Apr 2024	Ronja Evolution	Nørholmen	3 h 50 min
07 Apr 2024	Ronja Evolution	Nørholmen	3 h 34 min
27 Mar 2024	Ronja Mistral	Prestholmane	3 h 10 min
26 Mar 2024	Ronja Mistral	Prestholmane	3 h 47 min

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

Licences

Site MAB: 3,900 tonnes

Licence	Type	Capacity	Holder
M HØ 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	733 t	Mowi Seawater Norway AS
M RA 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	733 t	Mowi Seawater Norway AS
M VA 0002	Kommersiell / matfiskSalmon, Rainbow trout, Trout	733 t	Mowi Seawater Norway AS
M VA 0018	Kommersiell / matfiskSalmon, Rainbow trout, Trout	733 t	Mowi Seawater Norway AS
M VN 0014	Kommersiell / matfiskSalmon, Rainbow trout, Trout	733 t	Mowi Seawater Norway AS

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