The work „Methodological guide for fish farmers” is a contribution to the knowledge in the field of aquaculture, aiming at, particularly, ensuring the health of fish raised in ponds in the Prut River basin through sustainable practices of pond management. The guide was developed within the cross-border project 2 SOFT 1.2./47 „Team up for healthy fish in aquaculture systems of the Prut river basin” - TeamUp HealthyFish and recommended for editing by the Scientific Council of the Institute of Zoology. The authors of the guide update the methods of rapid diagnosis of cyprinid diseases, suggesting...