Lumpfish (Cyclopterus lumpus L.) develop amoebic gill disease (AGD) after experimental challenge with Paramoeba perurans and can transfer amoebae to Atlantic salmon (Salmo salar L.)

- Lumpfish develop AGD after experimental challenge.
- Lumpfish are less susceptible to P. perurans compared to Atlantic salmon.
- Lumpfish can transfer amoebae to Atlantic salmon.
- The gill scoring system used for salmon is not applicable for lumpfish, so both scoring and screening by PCR is recommended.