Korsholman

Site 19195 · 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 39 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

6Lice treatments in 2026Latest: Mechanical delousing, week 34, 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

2Wellboat visits in 2026by 1 vessel · latest 05 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	0.00	0.5	Below the limit
2	0.03	0.5	Below the limit
3	0.03	0.5	Below the limit
4	0.03	0.5	Below the limit
5	0.00	0.5	Below the limit
6	0.01	0.5	Below the limit
7	0.01	0.5	Below the limit
8	0.03	0.5	Below the limit
9	0.00	0.5	Below the limit
10	0.01	0.5	Below the limit
11	0.04	0.5	Below the limit
12	0.01	0.5	Below the limit
13	0.00	0.5	Below the limit
14	0.02	0.5	Below the limit
15	0.08	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	0.02	0.2	Below the limit
22	0.09	0.5	Below the limit
23	0.07	0.5	Below the limit
24	0.02	0.5	Below the limit
25	0.00	0.5	Below the limit
26	0.11	0.5	Below the limit
27	0.14	0.5	Below the limit
28	0.10	0.5	Below the limit
29	0.03	0.5	Below the limit
30	0.18	0.5	Below the limit
31	0.18	0.5	Below the limit
32	0.15	0.5	Below the limit
33	0.21	0.5	Below the limit
34	0.02	0.5	Below the limit
35	0.12	0.5	Below the limit
36	0.40	0.5	Near 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 29 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	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	Reported without a count
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	0.06	0.5	Below the limit
29	0.06	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	0.01	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	0.00	0.5	Below the limit
46	0.00	0.5	Below the limit
47	0.00	0.5	Below the limit
48	0.04	0.5	Below the limit
49	0.03	0.5	Below the limit
50	0.01	0.5	Below the limit
51	0.00	0.5	Below the limit
52	0.00	0.5	Below the limit

20243 of 37 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	0.14	0.5	Below the limit
2	0.03	0.5	Below the limit
3	0.10	0.5	Below the limit
4	0.08	0.5	Below the limit
5	0.13	0.5	Below the limit
6	0.10	0.5	Below the limit
7	0.10	0.5	Below the limit
8	0.15	0.5	Below the limit
9	0.13	0.5	Below the limit
10	0.07	0.5	Below the limit
11	0.11	0.5	Below the limit
12	0.05	0.5	Below the limit
13	0.20	0.5	Below the limit
14	0.10	0.5	Below the limit
15	0.13	0.5	Below the limit
16	0.11	0.2	Below the limit
17	0.01	0.2	Below the limit
18	0.02	0.2	Below the limit
19	0.04	0.2	Below the limit
20	0.02	0.2	Below the limit
21	0.06	0.2	Below the limit
22	0.16	0.5	Below the limit
23	0.23	0.5	Below the limit
24	0.40	0.5	Near the limit
25	0.47	0.5	Near the limit
26	0.08	0.5	Below the limit
27	0.10	0.5	Below the limit
28	0.31	0.5	Below the limit
29	0.48	0.5	Near the limit
30	1.01	0.5	Above the limit
31	0.85	0.5	Above the limit
32	0.16	0.5	Below the limit
33	0.20	0.5	Below the limit
34	0.10	0.5	Below the limit
35	0.17	0.5	Below the limit
36	0.33	0.5	Below the limit
37	0.51	0.5	Above the limit
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 14 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
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	0.00	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	0.01	0.5	Below the limit
48	0.00	0.5	Below the limit
49	0.05	0.5	Below the limit
50	0.04	0.5	Below the limit
51	0.06	0.5	Below the limit
52	0.10	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 34, 2026
Mechanical delousing1 pen
Week 33, 2026
Mechanical delousing3 pens
Week 32, 2026
Thermal delousing1 pen
Week 28, 2026
Mechanical delousingWhole site

Show all 19

Week 24, 2026
Mechanical delousingWhole site
Week 17, 2026
Thermal delousing4 pens
Week 51, 2025
Thermal delousingWhole site
Week 38, 2025
Thermal delousingWhole site
Week 30, 2025
Medicinal feed3 pens · Emamectin benzoat
Week 29, 2025
Medicinal feedWhole site · Emamectin benzoat
Week 28, 2025
Medicinal feedWhole site · Emamectin benzoat
Week 33, 2024
Mechanical delousing1 pen
Week 32, 2024
Mechanical delousing4 pens
Week 31, 2024
Mechanical delousing3 pens
Week 30, 2024
Mechanical delousing2 pens
Week 26, 2024
Mechanical delousing, Thermal delousing2 pens
Week 25, 2024
Mechanical delousing, Thermal delousing2 pens
Week 17, 2024
Thermal delousingWhole site
Week 42, 2023
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

2 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
05 Aug 2026	Froy Saga	Flatøyfjorden	13 h 41 min
20 Apr 2026	Froy Saga	Rundklumpen	65 h 44 min
21 Dec 2025	Froy Saga	Lille Torsøy	25 h 21 min
20 Dec 2025	Froy Saga	Lille Torsøy	2 h 36 min
20 Dec 2025	Froy Saga	Lille Torsøy	2 h 12 min
20 Dec 2025	Froy Saga	Lille Torsøy	1 h 38 min
21 Sep 2025	Freyja	Eggesbønes	3 h 21 min
20 Sep 2025	Freyja	Eggesbønes	10 h 33 min
18 Sep 2025	Freyja	Eggesbønes	24 h 3 min
18 Sep 2025	Freyja	Eggesbønes	14 h 11 min
17 Sep 2025	Freyja	Eggesbønes	4 h 32 min
28 Jul 2024	Froy Jarl	Lille Torsøy	20 h 30 min

Show 14 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
24 Jun 2024	Freyja	Lille Torsøy	11 h 42 min
24 Jun 2024	Freyja	Lille Torsøy	4 h 15 min
24 Jun 2024	Froy Jarl	Lille Torsøy	23 h 50 min
23 Jun 2024	Froy Jarl	Lille Torsøy	33 min
23 Jun 2024	Freyja	Lille Torsøy	4 h 5 min
22 Jun 2024	Froy Jarl	Reinvika	7 h 23 min
22 Jun 2024	Freyja	Indre Skjervøy	9 h 44 min
22 Jun 2024	Froy Jarl	Reinvika	1 h 13 min
21 Jun 2024	Freyja	Indre Skjervøy	7 h 28 min
21 Jun 2024	Froy Jarl	Reinvika	11 h 50 min
27 Apr 2024	Freyja	Lille Torsøy	15 h 31 min
26 Apr 2024	Freyja	Lille Torsøy	10 h 34 min
25 Apr 2024	Freyja	Lille Torsøy	1 h 57 min
24 Apr 2024	Freyja	Lille Torsøy	18 h 36 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
ST H 0047	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Mowi Seawater Norway AS

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