Recording of the seal population in the Lower Saxony Wadden Sea 2017. The seal population in the Lower Saxony Wadden Sea is determined annually. For this purpose, counting flights are carried out in the summer months (May - September). During these months the seals give birth, raise their young and change their hair. The counts take place at low water. At this time the seals are resting on the dry berths. The counts are coordinated trilaterally via the 'Seal Management Plan'. The data is part of the Trilateral Monitoring and Assessment Program (TMAP). Monitoring of Common seals in the Wadden Sea of Lower Saxony 2017. The common seal population in the Wadden Sea of Lower Saxony is annually determined by aerial surveys at low tides during the summer months (May - September). In this period whelping, nursing and molding of the seals take place. The counts are trilaterally coordinated according to the 'Seal Management Plan'; the data is part of the Trilateral Monitoring and Assessment Program (TMAP).