Svellungen

Site 13727 · Hitra municipality · Production area 6, Nordmøre og Sør-Trøndelag

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 7 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

3Wellboat visits in 2026by 2 different vessels · latest 30 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

Show as table

Adult female lice per fish per week, 2026
Week	Adult female lice per fish	Lice limit	Status
1	0.48	0.5	Near the limit
2	0.35	0.5	Below the limit
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	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 52 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	0.03	0.5	Below the limit
2	0.01	0.5	Below the limit
3	0.01	0.5	Below the limit
4	0.01	0.5	Below the limit
5	0.06	0.5	Below the limit
6	0.06	0.5	Below the limit
7	0.04	0.5	Below the limit
8	0.02	0.5	Below the limit
9	0.03	0.5	Below the limit
10	0.07	0.5	Below the limit
11	0.10	0.5	Below the limit
12	0.13	0.5	Below the limit
13	0.13	0.5	Below the limit
14	0.15	0.5	Below the limit
15	0.21	0.5	Below the limit
16	0.01	0.2	Below the limit
17	0.06	0.2	Below the limit
18	0.05	0.2	Below the limit
19	0.03	0.2	Below the limit
20	0.04	0.2	Below the limit
21	0.04	0.2	Below the limit
22	0.04	0.5	Below the limit
23	0.04	0.5	Below the limit
24	0.10	0.5	Below the limit
25	0.07	0.5	Below the limit
26	0.11	0.5	Below the limit
27	0.15	0.5	Below the limit
28	0.23	0.5	Below the limit
29	0.05	0.5	Below the limit
30	0.32	0.5	Below the limit
31	0.43	0.5	Near the limit
32	0.14	0.5	Below the limit
33	0.11	0.5	Below the limit
34	0.17	0.5	Below the limit
35	0.08	0.5	Below the limit
36	0.11	0.5	Below the limit
37	0.33	0.5	Below the limit
38	0.18	0.5	Below the limit
39	0.19	0.5	Below the limit
40	0.11	0.5	Below the limit
41	0.07	0.5	Below the limit
42	0.23	0.5	Below the limit
43	0.08	0.5	Below the limit
44	0.15	0.5	Below the limit
45	0.21	0.5	Below the limit
46	0.12	0.5	Below the limit
47	0.26	0.5	Below the limit
48	0.25	0.5	Below the limit
49	0.26	0.5	Below the limit
50	0.27	0.5	Below the limit
51	0.24	0.5	Below the limit
52	0.29	0.5	Below the limit

20240 of 22 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	0.2	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	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	0.13	0.5	Below the limit
36	0.14	0.5	Below the limit
37	0.03	0.5	Below the limit
38	0.00	0.5	Below the limit
39	0.00	0.5	Below the limit
40	0.01	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	0.00	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	0.00	0.5	Below the limit
51	0.00	0.5	Below the limit
52	0.00	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 46, 2025
Mechanical delousing3 pens
Week 43, 2025
Mechanical delousing3 pens
Week 42, 2025
Mechanical delousing1 pen
Week 40, 2025
Mechanical delousingWhole site

Show all 10

Week 38, 2025
Mechanical delousingWhole site
Week 35, 2025
Mechanical delousingWhole site
Week 32, 2025
Mechanical delousingWhole site
Week 29, 2025
Mechanical delousingWhole site
Week 16, 2025
Thermal delousingWhole site
Week 45, 2024
Freshwater treatmentWhole 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

3 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
30 Aug 2026	Ronja Evolution	Kåholmen	1 h 17 min
18 Mar 2026	Froy Saga	Valøyan disease or zone there	19 h 46 min
17 Mar 2026	Froy Saga	Valøyan disease or zone there	33 min
30 May 2025	Froy Saga	Varden	13 h 10 min
29 May 2025	Froy Saga	Bremnessvaet disease or zone there	7 h 24 min
17 Apr 2025	Freyja	Leite	1 h 6 min
17 Apr 2025	Freyja	Leite	4 h 32 min
16 Apr 2025	Freyja	Leite	7 h 28 min
16 Apr 2025	Freyja	Leite	9 h 16 min
15 Apr 2025	Freyja	Leite	7 h 45 min
14 Apr 2025	Freyja	Leite	22 h 27 min
09 Nov 2024	Freyja	Leite	18 h 24 min

Show 3 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
08 Nov 2024	Freyja	Leite	19 h 42 min
02 Aug 2024	Ronja Evolution	no other farm	3 h 31 min
01 Aug 2024	Ronja Evolution	Leite	3 h 46 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
ST H 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	2,626 t	Mowi Seawater Norway AS
ST H 0005	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS
ST H 0025	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS

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