Grey Seal Numbers in the Wadden Sea and on Helgoland in 2013-2014

Trilateral Seal Expert Group (TSEG)

The German and Dutch Wadden Sea areas were surveyed for grey seals (Halichoerus grypus) by means of coordinated aerial and boat counts during the pupping season (November-January). On Helgoland (Germany), surveys were carried out from land. Furthermore, dedicated grey seal aerial surveys were carried out during the moulting period (March-April) in the German and Dutch Wadden Sea. In the Danish Wadden Sea grey seals were only counted during the summer counts for harbour seals (Phoca vitulina).

Authors: Sophie Brasseur, Richard Czeck, Britta Diederichs, Anders Galatius, Lasse Fast Jensen, Peter Körber, Ursula Siebert, Jonas Teilmann, Sascha Klöpper