Slettholmene

Site 24456 · Frøya municipality · Production area 6, Nordmøre og Sør-Trøndelag

Status unknown: not reported in week 39Operated by Mowi Seawater Norway AS

unknownAdult female lice per fishNo count in week 39. Latest: 0.33 in week 4, 2026Week 39, 2026 · Norwegian Food Safety Authority · updated 01 Oct 2026

1Weeks above the limit in 2026of 4 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

1Lice treatments in 2026Latest: Mechanical delousing, week 3, 20262026 · Norwegian Food Safety Authority · updated 01 Oct 2026

1Active disease casesPD, suspected 15 Sep 2025Register since 26 Nov 2024 · Norwegian Food Safety Authority · updated 01 Oct 2026

0Wellboat visits in 2026Latest visit 15 Oct 2025Derived 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	0.48	0.5	Near the limit
2	0.73	0.5	Above the limit
3	0.39	0.5	Below the limit
4	0.33	0.5	Below the limit
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	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

Earlier years

20251 of 49 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	0.00	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	0.00	0.5	Below the limit
11	0.00	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	0.2	Below the limit
17	0.02	0.2	Below the limit
18	0.02	0.2	Below the limit
19	0.02	0.2	Below the limit
20	0.00	0.2	Below the limit
21	0.02	0.2	Below the limit
22	0.02	0.5	Below the limit
23	0.08	0.5	Below the limit
24	0.05	0.5	Below the limit
25	0.07	0.5	Below the limit
26	0.08	0.5	Below the limit
27	0.03	0.5	Below the limit
28	0.03	0.5	Below the limit
29	0.17	0.5	Below the limit
30	0.33	0.5	Below the limit
31	0.16	0.5	Below the limit
32	0.47	0.5	Near the limit
33	0.42	0.5	Near the limit
34	0.40	0.5	Near the limit
35	0.20	0.5	Below the limit
36	0.15	0.5	Below the limit
37	0.23	0.5	Below the limit
38	unknown	0.5	Reported without a count
39	unknown	0.5	Reported without a count
40	unknown	0.5	Not reported
41	0.49	0.5	Near the limit
42	0.19	0.5	Below the limit
43	0.22	0.5	Below the limit
44	0.09	0.5	Below the limit
45	0.05	0.5	Below the limit
46	0.12	0.5	Below the limit
47	0.16	0.5	Below the limit
48	0.23	0.5	Below the limit
49	1.35	0.5	Above the limit
50	0.25	0.5	Below the limit
51	0.28	0.5	Below the limit
52	0.32	0.5	Below the limit

20240 of 2 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	Reported without a count
2	unknown	0.5	Reported without a count
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	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	0.00	0.5	Below the limit
52	0.00	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	0.27	0.5	Below the limit
41	0.05	0.5	Below the limit
42	0.32	0.5	Below the limit
43	0.03	0.5	Below the limit
44	0.15	0.5	Below the limit
45	0.20	0.5	Below the limit
46	0.03	0.5	Below the limit
47	0.15	0.5	Below the limit
48	0.08	0.5	Below the limit
49	0.33	0.5	Below the limit
50	0.23	0.5	Below the limit
51	0.22	0.5	Below the limit
52	unknown	0.5	Reported without a count

Treatments

Norwegian Food Safety Authority

Week 3, 2026
Mechanical delousing1 pen
Week 52, 2025
Mechanical delousing1 pen
Week 50, 2025
Mechanical delousingWhole site
Week 47, 2025
Mechanical delousingWhole site

Show all 15

Week 44, 2025
Mechanical delousingWhole site
Week 42, 2025
Mechanical delousingWhole site
Week 37, 2025
Mechanical delousing2 pens
Week 35, 2025
Mechanical delousingWhole site
Week 33, 2025
Mechanical delousingWhole site
Week 31, 2025
Mechanical delousingWhole site
Week 27, 2025
Mechanical delousingWhole site
Week 49, 2023
Mechanical delousing2 pens
Week 46, 2023
Mechanical delousingWhole site
Week 43, 2023
Mechanical delousingWhole site
Week 41, 2023
Mechanical delousingWhole site

Disease

Norwegian Food Safety Authority

15 Sep 2025
Pancreas disease (PD): suspectedStatus: active · Subtype SAV2 · started 15 Sep 2025 · Norwegian Food Safety Authority

Escapes

Directorate of Fisheries

No escapes reported from this site since 2006.

Wellboat visits

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
15 Oct 2025	Froy Saga	Grøttingsøy disease or zone there	1 h 6 min
12 Oct 2025	Froy Saga	Grøttingsøy disease or zone there	6 h 33 min
05 Oct 2025	Freyja	Grøttingsøy disease or zone there	1 h 30 min
03 Oct 2025	Froy Saga	Grøttingsøy disease or zone there	6 h 32 min
02 Oct 2025	Freyja	Grøttingsøy disease or zone there	1 h 40 min
02 Oct 2025	Froy Saga	Grøttingsøy disease or zone there	39 min
14 Dec 2024	Ronja Evolution	Oksebåsen V	5 h 17 min
10 Jan 2024	Froy Jarl	Hendneset	1 h 40 min

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

Licences

Site MAB: unknown

No licences linked to this site in the aquaculture register.

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