Grunnsøya

Site 24615 · Kinn municipality · Production area 4, Nordhordland til Stadt

Status unknown: not reported in week 39Operated by E. Karstensen Fiskeoppdrett AS · group unknown

unknownAdult female lice per fishNo count in week 39. Latest: 0.00 in week 23, 2026Week 39, 2026 · Norwegian Food Safety Authority · updated 01 Oct 2026

0Weeks above the limit in 2026of 23 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

11Wellboat visits in 2026by 5 different vessels · latest 13 Jun 2026Derived from AIS · Norwegian Coastal Administration (AIS) · updated 01 Oct 2026

1Escapes reported100 salmon, August 2018Since 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	0.04	0.5	Below the limit
2	0.01	0.5	Below the limit
3	0.01	0.5	Below the limit
4	0.00	0.5	Below the limit
5	0.09	0.5	Below the limit
6	0.03	0.5	Below the limit
7	0.03	0.5	Below the limit
8	0.01	0.5	Below the limit
9	0.03	0.5	Below the limit
10	0.05	0.5	Below the limit
11	0.04	0.5	Below the limit
12	0.03	0.5	Below the limit
13	0.08	0.5	Below the limit
14	0.03	0.5	Below the limit
15	0.03	0.5	Below the limit
16	0.03	0.2	Below the limit
17	0.07	0.2	Below the limit
18	0.05	0.2	Below the limit
19	0.05	0.2	Below the limit
20	0.05	0.2	Below the limit
21	0.05	0.2	Below the limit
22	0.05	0.5	Below the limit
23	0.00	0.5	Below the limit
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

20250 of 35 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

Show as table

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	0.00	0.2	Below the limit
19	0.00	0.2	Below the limit
20	0.00	0.2	Below the limit
21	0.00	0.2	Below the limit
22	0.00	0.5	Below the limit
23	0.00	0.5	Below the limit
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	0.01	0.5	Below the limit
29	0.01	0.5	Below the limit
30	0.00	0.5	Below the limit
31	0.01	0.5	Below the limit
32	0.00	0.5	Below the limit
33	0.06	0.5	Below the limit
34	0.04	0.5	Below the limit
35	0.07	0.5	Below the limit
36	0.05	0.5	Below the limit
37	0.09	0.5	Below the limit
38	0.09	0.5	Below the limit
39	0.09	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	0.04	0.5	Below the limit
45	0.09	0.5	Below the limit
46	0.01	0.5	Below the limit
47	0.05	0.5	Below the limit
48	0.03	0.5	Below the limit
49	0.04	0.5	Below the limit
50	0.03	0.5	Below the limit
51	0.03	0.5	Below the limit
52	0.03	0.5	Below the limit

20240 of 26 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

Show as table

Adult female lice per fish per week, 2024
Week	Adult female lice per fish	Lice limit	Status
1	0.07	0.5	Below the limit
2	0.05	0.5	Below the limit
3	0.07	0.5	Below the limit
4	0.08	0.5	Below the limit
5	0.05	0.5	Below the limit
6	0.10	0.5	Below the limit
7	0.20	0.5	Below the limit
8	0.08	0.5	Below the limit
9	0.15	0.5	Below the limit
10	0.08	0.5	Below the limit
11	0.07	0.5	Below the limit
12	0.07	0.5	Below the limit
13	0.08	0.5	Below the limit
14	0.07	0.5	Below the limit
15	0.03	0.5	Below the limit
16	0.05	0.2	Below the limit
17	0.03	0.2	Below the limit
18	0.05	0.2	Below the limit
19	0.02	0.2	Below the limit
20	0.05	0.2	Below the limit
21	0.07	0.2	Below the limit
22	0.08	0.5	Below the limit
23	0.07	0.5	Below the limit
24	0.05	0.5	Below the limit
25	0.05	0.5	Below the limit
26	0.00	0.5	Below the limit
27	unknown	0.5	Reported without a count
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

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

Show as table

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	0.07	0.5	Below the limit
46	0.02	0.5	Below the limit
47	0.03	0.5	Below the limit
48	0.03	0.5	Below the limit
49	0.02	0.5	Below the limit
50	0.03	0.5	Below the limit
51	0.02	0.5	Below the limit
52	0.03	0.5	Below the limit

Treatments

Norwegian Food Safety Authority

Week 40, 2025
Thermal delousing, Freshwater treatmentWhole site
Week 34, 2025
Medicinal feed3 pens · Emamectin benzoat

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

16 Aug 2018
100 salmon escapedCause: Predator · recaptured 1 · Directorate of Fisheries

Wellboat visits

11 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
13 Jun 2026	Ro Master	Svartekari	1 h 54 min
05 Jun 2026	Ro Master	Myrane	2 h 6 min
02 Jun 2026	Rostein	Hesteneset	1 h 20 min
02 Jun 2026	Rostein	Hesteneset	1 h 41 min
21 May 2026	Ro Server	Hesteneset	4 h 31 min
06 May 2026	Ro Server	Hesteneset	2 h 5 min
06 Apr 2026	Robas	Hesteneset	1 h 59 min
28 Mar 2026	Robas	Hesteneset	35 min
28 Mar 2026	Robas	Hesteneset	1 h 15 min
26 Mar 2026	Robas	Nesevågen	2 h 6 min
17 Jan 2026	Ro Spirit	Skaganeset	2 h 12 min
30 Sep 2025	Ro Server	Lindeneset	8 h 47 min

Show 15 older visits

Arrival	Vessel	Previous farm (14 days)	Duration
29 Sep 2025	Ro Fjell	Lausund	20 h 59 min
29 Sep 2025	Ro Server	Lindeneset	14 h 51 min
09 May 2025	Ro Sailor	Heggeset	3 h 46 min
22 Apr 2025	Langsund	Hesteneset	49 min
01 Jul 2024	Rostein	Sandkvia	49 min
30 Jun 2024	Rostein	Hesteneset	1 h 24 min
16 Jun 2024	Ro Fjord	Brattholmen	3 h 30 min
05 Jun 2024	Robris	Hesteneset	1 h 41 min
05 Jun 2024	Robris	Hesteneset	56 min
05 Jun 2024	Rostein	Kvernhusvika	1 h 22 min
15 May 2024	Rostein	Hesteneset	2 h 31 min
15 May 2024	Rostein	Instefjord	1 h 27 min
01 Apr 2024	Rostein	no other farm	3 h 2 min
01 Apr 2024	Rostein	no other farm	1 h 20 min
24 Mar 2024	Ro Arctic	Søreide	2 h 57 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
E. Karstensen Fiskeoppdrett AS	Week 40, 2023	Week 23, 2026
Marø Havbruk A/s	Week 45, 2025	Week 6, 2026

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

Licences

Site MAB: 3,120 tonnes

Licence	Type	Capacity	Holder
SF F 0001	Kommersiell / matfiskSalmon, Rainbow trout, Trout	782 t	E. Karstensen Fiskeoppdrett AS
SF F 0007	Kommersiell / matfiskSalmon, Rainbow trout, Trout	782 t	Marø Havbruk A/s
SF F 0031	Kommersiell / matfiskSalmon, Rainbow trout, Trout	782 t	Marø Havbruk A/s
SF F 0052	Kommersiell / matfiskSalmon, Rainbow trout, Trout	782 t	E. Karstensen Fiskeoppdrett AS

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