Seawater carbonate chemistry from a climate change trial investigating the nasal microbiota of Atlantic cod (Gadus morhua)

This study provides the first comprehensive analysis of the nasal microbiota (NM) in two marine fish species, the European sea bass and the Atlantic cod. Given its direct environmental exposure, fish NM is likely influenced by sea water fluctuations. We analysed the community structure, specificity regarding seawater, and interindividual variability of 32–38 fish reared under ambient conditions. Additionally, we conducted an experiment to investigate the influence of acidification and a simplified heatwave on cod NM (three fish per replicate).