Fish anesthesia is used during tagging, treatment, and research procedures in aquaculture and fisheries management. Welfare-appropriate anesthesia protocols minimize suffering during these interventions.
Fish anesthesia welfare involves the gap between regulatory requirements and actual practice in commercial aquaculture settings. Research facilities regulated under 3Rs frameworks have increasing requirements for anesthesia provision for painful procedures. Commercial aquaculture operations handling large numbers of fish for vaccination, measurement, or treatment often operate without equivalent requirements. A fish that is inadequately anesthetized or handled without anesthesia for a painful procedure experiences the procedure fully - the absence of pain responses visible to the handler does not indicate absence of pain. Extending welfare-appropriate anesthesia protocols from research to commercial settings represents a significant but achievable improvement in fish welfare.