Rainbow trout is one of the most widely farmed fish species, and the welfare implications of slaughter methods used in trout production are a growing area of regulatory attention.
Rainbow trout slaughter welfare is a significant issue given the enormous scale of production. Live chilling without prior stunning exposes fish to several minutes of conscious cold exposure before insensibility — a method that causes demonstrable stress responses including increased cortisol and struggling behaviour. Percussive stunning applied correctly renders fish immediately insensible, representing a welfare improvement achievable with basic equipment and training. The EU slaughter regulation applies to trout, but implementation and enforcement varies between member states. Welfare certification schemes that mandate effective stunning before slaughter for trout provide a market-based mechanism for driving improvement.