Amphibians used in research — particularly Xenopus frogs — have specific welfare needs that require attention to water quality, temperature, social housing, and pain management.
Amphibian research welfare has improved significantly since EU Directive 2010/63 extended Three Rs protections to these animals. Historical practices including surgery without anesthesia and housing in small, unstimulating containers are being replaced by evidence-based welfare standards. Water quality is the primary welfare variable — amphibians absorb everything in their aquatic environment through permeable skin, making water chemistry a direct health and welfare determinant. Pain management in amphibians is challenging because their response to analgesics differs from mammals, but this difficulty does not justify withholding pain relief — it justifies research into appropriate amphibian analgesic protocols.