Aquaculture may be designed for several purposes: for food production, for ornamental purposes, for recreation (sport fishing), as bait fish, for production of food additives such as seaweed. Aquaculture may be extensive or intensive. Good hygiene is essential for hatchery raising success and fish production. Ideally, you should not use the same equipment for more than one tank. However, some much more important guidelines must be followed. This edition aims to present some relevant topics in fresh water fish management that may be of interest for fish farms and for the other interested in veterinary medicine. In addition, to translate advanced information into fish production.