Development of a non-invasive, opto-acoustic underwater fish observatory

• Optical and hydroacoustic methods have so far only been used separately to observe and monitor fish stocks. Here we present a coupled hybrid system for the first time.
• Identification and size classification of fish and jellyfish species are carried out non-invasively and automatically with the help of AI algorithms.
• We have developed three different variants of the Underwater Fish Observatory (UFO) and tested them successfully in the Kiel Bight.