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The Salmon Ledger
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Disease case · Infectious salmon anaemia (ISA)

ISA at Trolløya SV

Site 13594 · Sortland municipality · Nordland · Holmøy Havbruk AS. Production area: Vestfjorden og Vesterålen.

  1. Suspected15 May 2025Food Safety Authority
  2. Confirmednot yet
  3. Closed24 Oct 2025Farm emptied and fallowed
Follow the farmAbout the wellboat analysis
  • 162Days from suspicion to closureFood Safety Authority
  • 1Wellboat visits up to 28 days before, from 1 vesselCoastal Administration (AIS) · 01 Oct 2026
  • 1Of them from a boat recently at a farm with an ISA/PD outbreakPlus 0 from a protection zone · within 14 days before the visit · The Salmon Ledger
  • 1Other farms with active ISA within 10 km at suspicionNorwegian Food Safety Authority · 01 Oct 2026

Wellboat visits before suspicion

The 28 days before the case started (suspected 15 May 2025). Each mark is one visit. A filled triangle means the boat had, in the previous 14 days, been at another farm with an active ISA or PD outbreak. An open triangle means it had only been at farms in a protection zone, with no outbreak there. Visits after suspicion are not included.

VisitCame from a farm with an ISA/PD outbreakCame from a farm in a protection zonePrevious farm unknown (no recorded stop in 14 days)

Sources: Coastal Administration (AIS), Food Safety Authority (cases, and zones via BarentsWatch) · visits derived by The Salmon Ledger · updated 01 Oct 2026

Visits in the 28 days before suspicion

DateVesselDurationCame from (last stop)Status there
11 May 2025Ro Master2 h 57 minStretarnesetISA/PD outbreak