Rossholmen N

Site 12003 · Stavanger municipality · Production area 2, Ryfylke

Status unknown: not reported in week 39Operated by Nordsjø Fjordbruk AS

unknownAdult female lice per fishNo count in week 39. Latest: 1.48 in week 34, 2026Week 39, 2026 · Norwegian Food Safety Authority · updated 01 Oct 2026

1Weeks above the limit in 2026of 34 weeks with a countCalculated by the Salmon Ledger · Norwegian Food Safety Authority · updated 01 Oct 2026

2Lice treatments in 2026Latest: Thermal delousing, week 16, 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

8Wellboat visits in 2026by 2 different vessels · latest 03 Sep 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	0.15	0.5	Below the limit
2	0.15	0.5	Below the limit
3	0.23	0.5	Below the limit
4	0.18	0.5	Below the limit
5	0.13	0.5	Below the limit
6	0.46	0.5	Near the limit
7	0.30	0.5	Below the limit
8	0.23	0.5	Below the limit
9	0.18	0.5	Below the limit
10	0.25	0.5	Below the limit
11	0.28	0.5	Below the limit
12	0.25	0.5	Below the limit
13	0.38	0.5	Below the limit
14	0.43	0.5	Near the limit
15	0.28	0.5	Below the limit
16	0.00	0.2	Below the limit
17	0.00	0.2	Below the limit
18	0.05	0.2	Below the limit
19	0.00	0.2	Below the limit
20	0.05	0.2	Below the limit
21	0.05	0.2	Below the limit
22	0.22	0.5	Below the limit
23	0.10	0.5	Below the limit
24	0.13	0.5	Below the limit
25	0.10	0.5	Below the limit
26	0.18	0.5	Below the limit
27	0.10	0.5	Below the limit
28	0.20	0.5	Below the limit
29	0.25	0.5	Below the limit
30	0.20	0.5	Below the limit
31	0.25	0.5	Below the limit
32	0.30	0.5	Below the limit
33	0.45	0.5	Near the limit
34	1.48	0.5	Above the limit
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

20250 of 17 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	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	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	0.00	0.5	Below the limit
44	0.00	0.5	Below the limit
45	0.00	0.5	Below the limit
46	0.03	0.5	Below the limit
47	0.00	0.5	Below the limit
48	0.03	0.5	Below the limit
49	0.08	0.5	Below the limit
50	0.13	0.5	Below the limit
51	0.05	0.5	Below the limit
52	0.10	0.5	Below the limit

20242 of 47 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	0.10	0.5	Below the limit
2	0.10	0.5	Below the limit
3	0.08	0.5	Below the limit
4	0.13	0.5	Below the limit
5	0.07	0.5	Below the limit
6	0.07	0.5	Below the limit
7	0.05	0.5	Below the limit
8	0.08	0.5	Below the limit
9	0.10	0.5	Below the limit
10	0.10	0.5	Below the limit
11	0.07	0.5	Below the limit
12	0.32	0.5	Below the limit
13	0.15	0.5	Below the limit
14	0.18	0.5	Below the limit
15	0.27	0.5	Below the limit
16	0.09	0.2	Below the limit
17	0.17	0.2	Near the limit
18	0.05	0.2	Below the limit
19	0.12	0.2	Below the limit
20	0.15	0.2	Below the limit
21	0.07	0.2	Below the limit
22	0.10	0.5	Below the limit
23	0.07	0.5	Below the limit
24	0.08	0.5	Below the limit
25	0.15	0.5	Below the limit
26	0.07	0.5	Below the limit
27	0.32	0.5	Below the limit
28	0.01	0.5	Below the limit
29	0.02	0.5	Below the limit
30	0.05	0.5	Below the limit
31	0.12	0.5	Below the limit
32	0.82	0.5	Above the limit
33	1.48	0.5	Above the limit
34	0.06	0.5	Below the limit
35	0.39	0.5	Below the limit
36	0.19	0.5	Below the limit
37	0.28	0.5	Below the limit
38	0.35	0.5	Below the limit
39	0.33	0.5	Below the limit
40	0.45	0.5	Near the limit
41	0.05	0.5	Below the limit
42	0.05	0.5	Below the limit
43	0.10	0.5	Below the limit
44	0.10	0.5	Below the limit
45	0.20	0.5	Below the limit
46	0.40	0.5	Near the limit
47	0.40	0.5	Near the limit
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 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	0.00	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	0.02	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	0.07	0.5	Below the limit
49	0.07	0.5	Below the limit
50	0.08	0.5	Below the limit
51	0.03	0.5	Below the limit
52	0.10	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 16, 2026
Thermal delousing1 pen
Week 15, 2026
Thermal delousing1 pen
Week 41, 2024
Thermal delousing1 pen
Week 38, 2024
Mechanical delousing2 pens

Show all 10

Week 35, 2024
Freshwater treatment1 pen
Week 34, 2024
Freshwater treatment3 pens
Week 33, 2024
Freshwater treatment1 pen
Week 32, 2024
Thermal delousing1 pen
Week 28, 2024
Thermal delousingWhole site
Week 16, 2024
Thermal delousing1 pen

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

8 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
03 Sep 2026	Namsos	Sunde	4 h 35 min
31 Aug 2026	Namsos	Sunde	2 h 9 min
24 Aug 2026	Kristoffer Tronds	Sunde	4 h 43 min
23 Aug 2026	Namsos	Sunde	2 h 42 min
20 Aug 2026	Namsos	Skaganeset	6 h 58 min
13 Apr 2026	Kristoffer Tronds	Sunde	11 h 24 min
11 Apr 2026	Kristoffer Tronds	Sunde	5 h 3 min
10 Apr 2026	Kristoffer Tronds	Sunde	5 h 29 min
05 Sep 2025	Seifjell	Ådnøy Sø	1 h 7 min
23 Nov 2024	Kristoffer Tronds	Porsvika	4 h 56 min
22 Nov 2024	Kristoffer Tronds	Langøyna Ø	2 h 29 min
29 Oct 2024	Kristoffer Tronds	Sunde	3 h 1 min

Show 22 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
26 Oct 2024	Kristoffer Tronds	Sunde	2 h 55 min
11 Oct 2024	Kristoffer Tronds	Sunde	7 h 54 min
09 Oct 2024	Kristoffer Tronds	Sunde	10 h 46 min
09 Oct 2024	Kristoffer Tronds	Sunde	59 min
05 Oct 2024	Kristoffer Tronds	Håøya Nø	12 h 43 min
04 Oct 2024	Kristoffer Tronds	Håøya Nø	10 h 9 min
21 Sep 2024	Navoey	Halsavika	13 h 7 min
20 Sep 2024	Navoey	Halsavika	15 h 6 min
19 Sep 2024	Navoey	Halsavika	13 h 57 min
15 Sep 2024	Kristoffer Tronds	Seglberget	2 h 9 min
21 Aug 2024	Kristoffer Tronds	Langøyna Ø	16 h 18 min
20 Aug 2024	Kristoffer Tronds	Langøyna Ø	3 h 10 min
19 Aug 2024	Kristoffer Tronds	Langøyna Ø	1 h 58 min
18 Aug 2024	Kristoffer Tronds	Langøyna Ø	5 h 29 min
18 Aug 2024	Kristoffer Tronds	Langøyna Ø	3 h 35 min
17 Aug 2024	Kristoffer Tronds	Langøyna Ø	7 h 1 min
12 Aug 2024	Kristoffer Tronds	Seglberget	6 h 11 min
11 Aug 2024	Kristoffer Tronds	Seglberget	9 h 29 min
08 Jul 2024	Kristoffer Tronds	Ådnøy Sø	33 h 57 min
21 Apr 2024	Kristoffer Tronds	Ihlholmen	9 h 4 min
17 Apr 2024	Navoey	Ystadneset	1 h 24 min
11 Jan 2024	Navoey	Ådnøy Sø	3 h 48 min

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

Who has reported

The companies that have submitted lice counts for this site, with the first and last week.

Company	From	To
Rogaland Fjordbruk AS	Week 40, 2023	Week 47, 2025
Nordsjø Fjordbruk AS	Week 39, 2025	Week 34, 2026

Source: Norwegian Food Safety Authority (organisation number on each lice report)

Licences

Site MAB: 3,600 tonnes

Licence	Type	Capacity	Holder
H K 0034	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
H K 0051	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Fjelberg Fjordbruk AS
H K 0062	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Fjelberg Fjordbruk AS
R FD 0005	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
R H 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Røvær Fjordbruk AS
R R 0009	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
R SD 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
R SD 0005	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
R SD 0021	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
R SD 0033	Kommersiell / matfiskSalmon, Rainbow trout, Trout	527 t	Nordsjø Fjordbruk AS
R SS 0017	Kommersiell / matfiskSalmon, Rainbow trout, Trout	830 t	Nordsjø Fjordbruk AS
R TV 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
R TV 0003	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS
R TV 0006	Kommersiell / matfiskSalmon, Rainbow trout, Trout	788 t	Nordsjø Fjordbruk AS

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