Growth, appetite, and mineral deposition in rainbow trout reared in fresh- or seawater under different CO2 regimes

• Published in: Aquaculture Vol. 600; p. 742234
• Main Authors: Pfalzgraff, Tilo, Volkoff, Helene, Iburg, Tine Moesgaard, Amlund, Heidi, Skov, Peter Vilhelm
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 30.04.2025
• Subjects: appetite; aquaculture; biomass; calcium; Carbon dioxide; excretion; feed conversion; Feeding; fish consumption; freshwater; gene expression; histopathology; hydrochemistry; Hypercapnia; hypothalamus; kidneys; liver; mineralization; Nephrocalcinosis; Oncorhynchus mykiss; oxygen consumption; peptides; Phosphorus; Recirculating aquaculture systems (RAS); seawater; specific growth rate; trout; voluntary intake; Hypercapnia; Phosphorus; Nephrocalcinosis; Recirculating aquaculture systems (RAS); Carbon dioxide; Feeding

Despite degassing efforts in recirculating aquaculture systems (RAS) and short hydraulic retention time in rearing units, carbon dioxide (CO2) concentrations reach a hypercapnic steady state. Furthermore, as CO2 excretion is correlated with the oxygen consumption of fish and bacteria, CO2 levels in...