Currently, diagnosis of gas bubble disease (GBD) in fish relies on visual observations of bubbles in various body parts and exophthalmus. These observations lack quantified information about gas bubble load, limiting their diagnostic value. This study evaluated the suitability of existing and novel diagnostic tools for detecting GBD in Atlantic salmon exposed to supersaturation induced by pressure reduction. Existing methods w...

Blood sampling of fish has received increasing interest from the industry. However, the impact of puncturing the caudal vasculature, a common sampling procedure, is poorly described. In this study, the histopathology of this procedure was examined in both acute and chronic stages.

Nephrocalcinosis is a widespread challenge in intensive production of salmon smolt. There is however no consensus on its aetiology, which makes it problematic to implement proper measures to limit its development. We performed a survey of nephrocalcinosis prevalence and environmental factors in 11 different hatcheries in Mid‐Norway as well as a 6‐month monitoring in one of the hatcheries. A multivariate analysis indicated that...