Mucosal organs exhibit distinct response signatures to hydrogen sulphide in Atlantic salmon (Salmo salar).

Hydrogen sulphide (HS) is considered an immunotoxicant, and its presence in the water can influence the mucosal barrier functions of fish. However, there is a significant knowledge gap on how fish mucosa responds to low environmental HS levels. The present study investigated the consequences of prolonged exposure to sub-lethal levels of HS on the mucosal defences of Atlantic salmon (Salmo salar).