Fosså

Site 11893 · Hjelmeland municipality · Production area 2, Ryfylke

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 14 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

5Wellboat visits in 2026by 3 different vessels · latest 02 Jul 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	0.00	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	0.00	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

20250 of 32 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	0.22	0.5	Below the limit
2	0.25	0.5	Below the limit
3	0.33	0.5	Below the limit
4	0.40	0.5	Near the limit
5	0.43	0.5	Near the limit
6	0.16	0.5	Below the limit
7	0.18	0.5	Below the limit
8	0.19	0.5	Below the limit
9	0.24	0.5	Below the limit
10	0.22	0.5	Below the limit
11	0.40	0.5	Near the limit
12	0.14	0.5	Below the limit
13	0.12	0.5	Below the limit
14	0.22	0.5	Below the limit
15	0.07	0.5	Below the limit
16	0.11	0.2	Below the limit
17	0.10	0.2	Below the limit
18	0.08	0.2	Below the limit
19	0.13	0.2	Below the limit
20	0.11	0.2	Below the limit
21	0.14	0.2	Below the limit
22	0.29	0.5	Below the limit
23	0.17	0.5	Below the limit
24	0.43	0.5	Near the limit
25	0.26	0.5	Below the limit
26	0.38	0.5	Below the limit
27	0.30	0.5	Below the limit
28	0.27	0.5	Below the limit
29	0.44	0.5	Near the limit
30	0.18	0.5	Below the limit
31	0.41	0.5	Near the limit
32	0.38	0.5	Below the limit
33	unknown	0.5	Reported without a count
34	unknown	0.5	Reported without a count
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

20240 of 40 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	0.26	0.5	Below the limit
2	0.18	0.5	Below the limit
3	0.26	0.5	Below the limit
4	0.22	0.5	Below the limit
5	0.17	0.5	Below the limit
6	0.39	0.5	Below the limit
7	0.42	0.5	Near the limit
8	0.41	0.5	Near the limit
9	unknown	0.5	Reported without a count
10	unknown	0.5	Reported without a count
11	unknown	0.5	Reported without a count
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	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	0.00	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	0.01	0.5	Below the limit
31	0.00	0.5	Below the limit
32	0.00	0.5	Below the limit
33	0.01	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	0.00	0.5	Below the limit
42	0.00	0.5	Below the limit
43	0.01	0.5	Below the limit
44	0.00	0.5	Below the limit
45	0.01	0.5	Below the limit
46	0.01	0.5	Below the limit
47	0.00	0.5	Below the limit
48	0.02	0.5	Below the limit
49	0.05	0.5	Below the limit
50	0.01	0.5	Below the limit
51	0.15	0.5	Below the limit
52	0.08	0.5	Below the limit

20230 of 12 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	unknown	0.5	Not reported
41	0.29	0.5	Below the limit
42	0.44	0.5	Near the limit
43	0.08	0.5	Below the limit
44	0.13	0.5	Below the limit
45	0.33	0.5	Below the limit
46	0.21	0.5	Below the limit
47	0.34	0.5	Below the limit
48	0.28	0.5	Below the limit
49	0.25	0.5	Below the limit
50	0.21	0.5	Below the limit
51	0.23	0.5	Below the limit
52	0.24	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 34, 2025
Thermal delousing1 pen
Week 30, 2025
Mechanical delousing3 pens
Week 27, 2025
Thermal delousing1 pen
Week 26, 2025
Mechanical delousing2 pens

Show all 13

Week 25, 2025
Mechanical delousing2 pens
Week 23, 2025
Thermal delousing2 pens
Week 22, 2025
Mechanical delousing2 pens
Week 17, 2025
Mechanical delousing1 pen
Week 15, 2025
Mechanical delousing, Thermal delousing3 pens
Week 12, 2025
Medicinal bath2 pens · Azamethiphos
Week 6, 2025
Medicinal bath4 pens · Azamethiphos
Week 46, 2023
Thermal delousingWhole site
Week 43, 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

5 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
02 Jul 2026	Mowi Star	Tepstad	4 h 11 min
26 Jun 2026	Froy Jarl	Smedholmen	1 h 31 min
26 Jun 2026	Froy Jarl	Smedholmen	5 h 42 min
25 Jun 2026	Ronja Maloy	Smedholmen	5 h 2 min
24 Jun 2026	Froy Jarl	Smedholmen	4 h 34 min
31 Aug 2025	Ronja Merdoe	Smedholmen	6 h 39 min
29 Aug 2025	Tauranga	Kjeahola	10 h 0 min
28 Aug 2025	Ronja Merdoe	Smedholmen	3 h 30 min
28 Aug 2025	Ronja Merdoe	Smedholmen	3 h 54 min
27 Aug 2025	Tauranga	Kjeahola	11 h 48 min
26 Aug 2025	Ronja Merdoe	Smedholmen	6 h 35 min
25 Aug 2025	Tauranga	Kjeahola	9 h 23 min

Show 45 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
18 Aug 2025	Ronja Maloy	Herøy	16 h 37 min
09 Aug 2025	Ronja Maloy	Kjeahola	2 h 44 min
09 Aug 2025	Ronja Maloy	Smedholmen	3 h 22 min
18 Jul 2025	Ronja Maloy	Kjeahola	2 h 51 min
17 Jul 2025	Ronja Maloy	Kjeahola	9 h 29 min
16 Jul 2025	Ronja Maloy	Skorpeosen	6 h 39 min
07 Jul 2025	Ro West	Smedholmen	40 min
06 Jul 2025	Ro West	Smedholmen	2 h 13 min
05 Jul 2025	Ro West	Smedholmen	15 h 20 min
29 Jun 2025	Ronja Merdoe	Bastli	7 h 4 min
25 Jun 2025	Tauranga	Herøy	7 h 47 min
22 May 2025	Ronja Merdoe	Halsavika	6 h 42 min
11 Apr 2025	Ronja Maloy	Ringja	1 h 45 min
10 Apr 2025	Ronja Maloy	Ringja	12 h 9 min
21 Mar 2025	Ronja Boroy	Hettaneset	5 h 40 min
20 Mar 2025	Ronja Boroy	Hettaneset	6 h 25 min
06 Feb 2025	Ronja Maloy	Åkre	9 h 27 min
05 Feb 2025	Ronja Maloy	Åkre	1 h 53 min
05 Feb 2025	Ronja Maloy	Åkre	6 h 48 min
05 Feb 2025	Ronja Maloy	Åkre	50 min
04 Feb 2025	Ronja Maloy	Åkre	6 h 46 min
03 Feb 2025	Ronja Maloy	Åkre	6 h 19 min
21 Jan 2025	Ronja Maloy	Vindsvik	2 h 55 min
08 Dec 2024	Ronja Maloy	Bastli	5 h 10 min
07 Dec 2024	Ronja Maloy	Bastli	9 h 2 min
07 Dec 2024	Ronja Maloy	Bastli	4 h 37 min
07 Dec 2024	Ronja Maloy	Tungesvik	4 h 8 min
19 Aug 2024	Navoey	Nappeholmane	6 h 36 min
13 Aug 2024	Ronja Evolution	Slåttenes	1 h 16 min
11 Aug 2024	Langsund	Kverhelleskjeret	49 min
29 May 2024	Neptun	Trommo	1 h 52 min
27 May 2024	Neptun	Trommo	1 h 52 min
18 May 2024	Ronja Evolution	Lønngrunnen	1 h 47 min
17 May 2024	Ronja Evolution	Lønngrunnen	2 h 4 min
15 May 2024	Ronja Evolution	Lønngrunnen	2 h 50 min
13 Mar 2024	Tauranga	Utåker	6 h 35 min
12 Mar 2024	Ronja Merdoe	no other farm	5 h 54 min
11 Mar 2024	Tauranga	Utåker	8 h 24 min
10 Mar 2024	Ronja Merdoe	no other farm	9 h 26 min
07 Mar 2024	Ronja Merdoe	Lindvik	5 h 55 min
06 Mar 2024	Tauranga	Utåker	9 h 27 min
05 Mar 2024	Ronja Merdoe	Lindvik	5 h 37 min
03 Mar 2024	Ronja Merdoe	Lindvik	6 h 49 min
29 Feb 2024	Ronja Merdoe	Lindvik	9 h 15 min
27 Feb 2024	Ronja Merdoe	Lindvik	5 h 37 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
R F 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS
R HM 0002	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS
R HM 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS
R HM 0008	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS
R TV 0002	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS

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