The automatic fish feeder supplies the fish in the aquarium around the clock. Up to four feedings with three dosages each can be pre-programmed per day via an LCD display. This makes it ideal for use in large aquariums with large fish populations, while the special sealing mechanism protects the food from moisture. A power supply unit can be purchased separately. This allows the device to switch to battery operation smoothly in the event of a power failure. The bracket for mounting on the aquarium wall for open aquariums or terrariums can also be purchased separately.