Just under 10% of households in the United States have an aquarium containing live fish, highlighting the popularity of these animals as pets. As this trend grows, fish owners are increasingly seeking veterinary care for their aquatic companions. This demand spans individualized treatment plans for sick or injured fish to broader pond and “herd health” management strategies. In response, veterinarians are becoming more interested in expanding their expertise in this unique and rewarding field. This masterclass is designed to benefit both practitioners beginning their journey into fish medicine and those with existing expertise seeking the latest updates in the field. A wide range of topics will be covered, including water quality management, updates on analgesia and anesthesia, and the challenges and best practices for euthanasia. Attendees will gain practical insights and evidence-based knowledge to enhance their approach to fish care, ensuring optimal outcomes for their patients.