The DAFINET workshop on Sustainable fish health control was organized in collaboration with Parafishcontrol and BANGFISH on October 23, 2018. In connection to the workshop the University of Copenhagen hosted a five day workshop on fish diseases. The 40 workshop participants comprised PFC partners and colleagues from various countries (Norway, Bangladesh, India, China, Indonesia, Italy, Denmark). The scientific fields touched upon ranged from PFC parasites (salmon lice, white spot disease parasite Ichthyophthirius multifiliis, zoonotic nematode Contracaecum osculatum), and environmental issues (arsenic substances and antibiotics in fish ponds), pigments in fish flesh, bacterial and viral infections of rainbow trout. The host species discussed ranged from Atlantic salmon and rainbow trout to tilapia and Asian catfish. Sonal Patel from Norway and Morten Limborg from Denmark presented new results and ideas from novel types of approaches in fish disease research – the holistic view on both host, microbiome and the environment. The connected fish disease course over five days focused on both basic classical techniques and more advanced methodologies such as ELISA, immunohistochemistry, histology, PCR, qPCR and DNA sequencing. The course addressed parasitic, bacterial and viral diseases in wild and farmed fish. The photo shows seven course participants from Bangladesh with professor Kurt Buchmann (KU) in the lab.