Good observation for whale watching “prospects by the end of March until the end of may, after the porpoise disappear from the river Weser. Last year two click detectors (hydrophones, known as C-PODs) in the fairway were installed by the GRD the Weser, which record the ultrasonic sounds (click trains”) the harbour porpoise, to learn more about the spatio temporal distribution and the reason of the visit. It will swim suspected that the small dolphins follow schools of fish to spawn from the North Sea into the Weser. Herring, smelt and the feint (red-list-art) comprise the largest share of the fish biomass in the Weser in the spring in volume and are suspected, the attractive lining to be, follow the whales. Actually over 30 ultrasonic sound effects to forage (feeding-click trains”) and almost as many communication sounds (communications click trains”) were recorded by one of the stationary listening detectors”, so the porpoise expert Sven Koschinski, the the difficult evaluation of C-POD data took over. This confirms that the harbour porpoise in the river Weser hunt fish and communicate with one another and also as pairs or groups to stop. Total 413 porpoise according to sequences were recorded.

Details of number, to do and stay at the harbour porpoise, the GRD on active assistance is dependent on and asked sailors to watch boaters, fishermen, residents and tourists who are traveling on or on the river Weser, the marine mammals that are usually difficult to be discovered. “Sometimes you can also their Blas”, a noisy howl at the emergence and exhaling, hear and discover so.