Comprehensive Colony Health Management and Emerging Pathogens of the Annual Killifish Species Nothobranchius furzeri.

The Leibniz Institute on Aging has maintained killifish colonies for over 15 y. Our veterinarians, scientists, and animal technicians developed a fish health scoring system and routine colony health surveillance program for our colonies. Over a 4-y period, health data from the African turquoise killifish Nothobranchius furzeri colony were systematically collected and analyzed. The fish health assessment system facilitated categorization of clinical signs and differentiation of fish with mild clinical signs from fish that required euthanasia. This report provides new information on clinical signs and conditions that may occur in young and aged N. furzeri. To be comprehensive, a colony health surveillance program incorporates animal health at both the individual and the population levels. The quarterly routine health monitoring program identified Mycobacterium spp. as the most common agent in our facility and identified the killifish pathogen (Loma acerinae) for the first time. Taken together, these findings demonstrate the importance of a comprehensive colony health management system in a fish research facility. By improving the health and welfare of fish used for research, the scientific community will benefit from less variable and more reliably reproducible research results.