Kattholmen II

Site 30437 · Frøya municipality · Production area 6, Nordmøre og Sør-Trøndelag

Status unknown: not reported in week 39Operated by Salmar Oppdrett AS · group SalMar

unknownAdult female lice per fishNo count in week 39. Latest: 0.00 in week 52, 2025Week 39, 2026 · Norwegian Food Safety Authority · updated 01 Oct 2026

unknownWeeks above the limit in 2026No weeks with a count in 2026Calculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

unknownLice treatments in 2026No lice reports in 20262026 · Norwegian Food Safety Authority · updated 01 Oct 2026

1Active disease casesPD, suspected 16 Jan 2026Register since 26 Nov 2024 · Norwegian Food Safety Authority · updated 01 Oct 2026

2Wellboat visits in 2026by 1 vessel · latest 08 Mar 2026Derived from AIS · Norwegian Coastal Administration (AIS) · updated 01 Oct 2026

1Escapes reported3 rainbow trout, September 2019Since 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.

2025

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	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	0.01	0.5	Below the limit
16	0.02	0.2	Below the limit
17	0.01	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	0.01	0.2	Below the limit
22	0.01	0.5	Below the limit
23	0.01	0.5	Below the limit
24	0.03	0.5	Below the limit
25	0.02	0.5	Below the limit
26	0.07	0.5	Below the limit
27	0.05	0.5	Below the limit
28	0.23	0.5	Below the limit
29	0.44	0.5	Near the limit
30	0.03	0.5	Below the limit
31	0.04	0.5	Below the limit
32	0.12	0.5	Below the limit
33	0.44	0.5	Near the limit
34	0.13	0.5	Below the limit
35	0.33	0.5	Below the limit
36	0.07	0.5	Below the limit
37	0.05	0.5	Below the limit
38	0.21	0.5	Below the limit
39	0.21	0.5	Below the limit
40	3.56	0.5	Above the limit
41	3.39	0.5	Above the limit
42	1.32	0.5	Above the limit
43	1.83	0.5	Above the limit
44	0.16	0.5	Below the limit
45	0.28	0.5	Below the limit
46	0.25	0.5	Below the limit
47	0.28	0.5	Below the limit
48	0.43	0.5	Near the limit
49	0.73	0.5	Above the limit
50	1.50	0.5	Above the limit
51	0.06	0.5	Below the limit
52	0.00	0.5	Below the limit

Earlier years

20241 of 18 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	0.33	0.5	Below the limit
2	0.80	0.5	Above the limit
3	0.33	0.5	Below the limit
4	0.42	0.5	Near the limit
5	0.28	0.5	Below the limit
6	0.38	0.5	Below the limit
7	0.02	0.5	Below the limit
8	0.06	0.5	Below the limit
9	0.09	0.5	Below the limit
10	0.05	0.5	Below the limit
11	0.06	0.5	Below the limit
12	0.04	0.5	Below the limit
13	0.11	0.5	Below the limit
14	0.04	0.5	Below the limit
15	0.11	0.5	Below the limit
16	0.05	0.2	Below the limit
17	0.13	0.2	Below the limit
18	0.15	0.2	Below the limit
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	unknown	0.5	Not reported
52	unknown	0.5	Not reported

20231 of 13 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	0.26	0.5	Below the limit
41	0.26	0.5	Below the limit
42	1.16	0.5	Above the limit
43	0.38	0.5	Below the limit
44	0.43	0.5	Near the limit
45	0.13	0.5	Below the limit
46	0.24	0.5	Below the limit
47	0.29	0.5	Below the limit
48	0.33	0.5	Below the limit
49	0.45	0.5	Near the limit
50	0.34	0.5	Below the limit
51	0.15	0.5	Below the limit
52	0.16	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 51, 2025
Other treatment1 pen · Ferskvann/Thermolicer
Week 48, 2025
Mechanical delousing1 pen
Week 44, 2025
Mechanical delousing3 pens
Week 43, 2025
Mechanical delousing2 pens

Show all 22

Week 42, 2025
Mechanical delousing2 pens
Week 41, 2025
Mechanical delousing2 pens
Week 40, 2025
Mechanical delousing, Thermal delousing2 pens
Week 37, 2025
Mechanical delousing5 pens
Week 36, 2025
Mechanical delousing3 pens
Week 35, 2025
Mechanical delousing2 pens
Week 34, 2025
Mechanical delousing5 pens
Week 30, 2025
Mechanical delousing4 pens
Week 29, 2025
Mechanical delousing1 pen
Week 8, 2024
Other treatment2 pens · Ferskvann/ Hydrolicer
Week 7, 2024
Other treatment3 pens · Optiflush
Week 4, 2024
Medicinal bath1 pen · Azamethiphos
Week 3, 2024
Medicinal bath2 pens · Azamethiphos
Week 51, 2023
Other treatment2 pens · Optiflush
Week 49, 2023
Other treatment2 pens · Ferskvann/Thermolicer, Ferskvannsbehandling
Week 45, 2023
Other treatment3 pens · Hydrolicer
Week 44, 2023
Other treatment1 pen · Hydrolicer
Week 43, 2023
Other treatment4 pens · Hydrolicer

Disease

Norwegian Food Safety Authority

16 Jan 2026
Pancreas disease (PD): suspectedStatus: active · Subtype SAV2 · started 16 Jan 2026 · Norwegian Food Safety Authority
14 Dec 2024
Infectious salmon anaemia (ISA): closedstarted 29 Apr 2024 · Norwegian Food Safety Authority

Escapes

Directorate of Fisheries

29 Sep 2019
3 rainbow trout escapedCause: Uavklart hva som har skjedd, men hendelse ifm avlusing med presenning. Årsak utredes. · recaptured 1 · Directorate of Fisheries

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
08 Mar 2026	Ro Vision	Kattholmen disease or zone there	1 h 13 min
07 Mar 2026	Ro Vision	Kattholmen disease or zone there	1 h 53 min
16 Dec 2025	Ro Vision	Kattholmen	6 h 39 min
09 Dec 2025	Ronja Princess	Nordskag	2 h 33 min
07 Dec 2025	Ronja Princess	Nordskag	2 h 44 min
03 Nov 2025	Ronja Princess	Nordskag	1 h 54 min
29 Oct 2025	Ronja Princess	Nordskag	1 h 35 min
29 Oct 2025	Ronja Princess	Gjæsingen	2 h 52 min
26 Oct 2025	Ro Vision	Kattholmen	2 h 25 min
21 Oct 2025	Ro Vision	Kattholmen	1 h 20 min
20 Oct 2025	Ro Vision	Kattholmen	3 h 38 min
20 Oct 2025	Ro Vision	Kattholmen	3 h 4 min

Show 31 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
20 Oct 2025	Ro Vision	Krabbholmen II	7 h 11 min
14 Oct 2025	Ro Vision	Tristeinen	2 h 8 min
13 Oct 2025	Ro Vision	Tristeinen	15 h 33 min
09 Sep 2025	Aasvaerfjord	Hallarøy V	4 h 0 min
22 Jul 2025	Ro Vision	Kattholmen	42 min
22 Jul 2025	Ro Vision	Kattholmen	51 min
21 Jul 2025	Ro Vision	Kattholmen	20 h 36 min
29 Jan 2025	Ronja Vita	Kattholmen	1 h 55 min
29 Jan 2025	Ronja Vita	Kattholmen	33 min
20 Jan 2025	Ronja Vita	Kattholmen	2 h 38 min
20 Jan 2025	Ronja Vita	no other farm	57 min
13 May 2024	Ronja Princess	Nordskag	2 h 34 min
13 May 2024	Ronja Princess	Nordskag	3 h 13 min
06 May 2024	Ronja Princess	Nordskag	2 h 45 min
05 May 2024	Ronja Princess	Ørnøya II	5 h 26 min
27 Apr 2024	Froy Odin	Nordskag	4 h 53 min
27 Apr 2024	Froy Odin	Nordskag	3 h 36 min
19 Apr 2024	Ro Senja	Nordskag	2 h 52 min
07 Apr 2024	Ronja Princess	no other farm	5 h 34 min
22 Feb 2024	Froy Odin	Kattholmen	2 h 28 min
21 Feb 2024	Froy Odin	Kattholmen	3 h 2 min
19 Feb 2024	Froy Odin	Kattholmen	6 h 13 min
16 Feb 2024	Ro Senja	Salatskjæra	35 h 0 min
24 Jan 2024	Ro Vision	Kattholmen	1 h 6 min
24 Jan 2024	Ro Vision	Kattholmen	2 h 44 min
23 Jan 2024	Ro Vision	Kattholmen	1 h 13 min
20 Jan 2024	Ro Vision	Kattholmen	2 h 26 min
20 Jan 2024	Ro Vision	Kattholmen	2 h 7 min
19 Jan 2024	Ro Vision	Kattholmen	1 h 38 min
19 Jan 2024	Ro Vision	Kattholmen	2 h 16 min
16 Jan 2024	Ro Vision	Kattholmen	4 h 24 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