According to monthly reports, 37.7 million farmed salmon and 2.4 million rainbow trout (larger than 3 grams) died in land-based hatcheries in 2023. Additionally, 62.8 million salmon and 2.5 million rainbow trout died during the sea phase of production.
The same three health challenges stand out in 2023 as in 2022, delousing injuries, complex gill disease, and winter ulcer. A significant change in 2023 is that damage caused by jellyfish is ranked among the ten most important health challenges.