DESCRIZIONE
The present invention relates to a method for detecting a school of fish with a fish observation watercraft, wherein an autonomous underwater vehicle is selected as the fish observation watercraft, the method comprising the following steps: a) detecting a school of fish; approaching the school of fish, the fish observation watercraft horizontally and to a lesser extent Diving depth when the school of fish approaches, c) orienting the fish-viewing watercraft so that the bow of the fish-viewing watercraft is directed towards the bottom and the stern of the fish-viewing watercraft is facing the water surface, d) passing the school of fish through the fish-viewing watercraft and thereby optically detecting the school of fish, passing through in an angle of more than 70 ° to the water surface.