Scientific fish tagging for population research and telemetry involves capture, handling and surgical or external attachment procedures. Welfare-conscious methodology reduces harm while maintaining scientific value.
Fish research tagging applies the 3Rs framework in a field context. The welfare burden of tagging includes acute stress from capture and handling, potential pain from tag attachment or surgical implantation, and ongoing discomfort from tag presence. Best practice minimises each of these: rapid handling with minimal air exposure, effective anaesthesia for surgical procedures, appropriate tag-to-body-weight ratios (typically under 2%), and proper wound closure and post-operative monitoring. The scientific justification must be proportionate to the welfare cost — population-level data essential for fisheries management or conservation planning generally meets this threshold. Refinement in fish research is an active area, with improving tag miniaturisation and non-invasive alternatives progressively reducing welfare impacts.