Anesthesia and sedation in fish aquaculture reduces the stress, injury, and mortality associated with essential handling procedures. Appropriate anesthetic protocols are increasingly recognized as a welfare standard in progressive aquaculture operations.
Fish handling without anesthesia causes measurable physiological stress responses that persist for hours after the handling event. In aquaculture settings where fish are routinely handled for grading, vaccination, treatment, and sampling, cumulative handling stress is a significant welfare burden. Anesthesia eliminates or substantially reduces this burden and reduces physical injury rates during handling. The investment in anesthetic agents and protocols is modest relative to the welfare benefit and is standard practice in salmon aquaculture in leading welfare jurisdictions. Extending anesthesia use across aquaculture species and regions represents a tractable welfare improvement.