Nephrocalcinosis in juvenile farmed Atlantic Salmon (Salmo salar) may be linked to osmoregulatory stress.

Autor: Klykken C; Aqua Kompetanse AS, Flatanger, Norway.; Department of Biology, Faculty of Science and Technology, Norwegian University of Science and Technology, Trondheim, Norway., Khan E; Department of Biotechnology and Food Science, Faculty of Science and Technology, Norwegian University of Science and Technology, Trondheim, Norway., Karlsen C; Aqua Kompetanse AS, Flatanger, Norway., Reed AK; Pharmaq Analytiq AS, Bergen, Norway., Attramadal KJK; Department of Biotechnology and Food Science, Faculty of Science and Technology, Norwegian University of Science and Technology, Trondheim, Norway., Olsen RE; Department of Biology, Faculty of Science and Technology, Norwegian University of Science and Technology, Trondheim, Norway., Boissonnot L; Aqua Kompetanse AS, Flatanger, Norway.
Jazyk: angličtina
Zdroj: Journal of fish diseases [J Fish Dis] 2023 Sep; Vol. 46 (9), pp. 943-956. Date of Electronic Publication: 2023 Jun 03.
DOI: 10.1111/jfd.13815
Abstrakt: 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 the most influencing factor for the prevalence of nephrocalcinosis was the supplementation of sea water during smolt production. In the 6-month monitoring, the hatchery introduced salinity in the production water prior to the change in day length. Mismatch in those environmental signals may increase the risk for developing nephrocalcinosis. Salinity fluctuations prior to smoltification can cause osmotic stress and result in unbalanced levels of ions in fish blood. This was clearly illustrated in our study, as the fish experienced chronic hypercalcaemia and hypermagnesaemia. Both magnesium and calcium are excreted over the kidneys and it is possible that their prolonged, elevated levels in plasma resulted in an oversaturation of the urine when finally excreted. This again could have led to the aggregation of calcium deposits within the kidney. This study indicates a relationship between osmotic stress induced by salinity changes in juvenile Atlantic salmon and the development of nephrocalcinosis. Other factors that may affect the severity of nephrocalcinosis are currently subjects for discussion.
(© 2023 The Authors. Journal of Fish Diseases published by John Wiley & Sons Ltd.)
Databáze: MEDLINE
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