Emulgated multi-vitamin preparation for strengthening fish during or after diseases, after introducing them into a new aquarium, for breeding and to vitaminize food for fish fry. Sera fishtamin® is also suitable for strengthening pond fish before and after hibernation. It can be added directly into the aquarium water. It is better, however, to drip 6 - 7 drops per fish directly onto the food a few minutes before feeding once a week. Pond fish should get 10 - 12 drops sera fishtamin® per fish every day for three weeks.