Native white-clawed crayfish farming for conservation and signal crayfish farming for food both present welfare considerations for these increasingly recognised sentient invertebrates.
Crayfish welfare in aquaculture centres on the growing evidence that these animals have functional nociceptive systems and are capable of something analogous to anxiety. Studies documenting anxiolytic drug effects on crayfish behaviour and avoidance learning in response to noxious stimuli support applying precautionary welfare principles. High stocking density, poor water quality, and aggressive interactions between conspecifics cause physical harm and potential stress. Killing methods including dropping in boiling water may cause prolonged suffering if crayfish experience pain. Chilling before dispatch is considered more welfare-positive. The scale of crayfish trapping and processing warrants systematic welfare consideration.