Division Common seal

At the beginning of the last century, around 10 000 common seals inhabited the Delta. Pollution, hunting and encroachment into their habitat due to the Delta Works had reduced their numbers to just a few dozen individuals up until 50 years ago. Over recent years, their numbers have grown to more than 100 in the Delta area, 50 % living in the Voordelta area.

They use tidal plains such as those at Hinderplaat, Bollen van de Ooster (Aardappelenbult) and Verklikkerplaat to rest. However, they do not breed well in the Voordelta. The plains provide insufficient peace and quiet for them to give birth to, suckle and raise their pups. Year-round peace and quiet is essential; the most critical period being before, during and after the pups' suckling period from 1 May to 1 September.

Measures restricting access to their resting places in Hinderplaat, Bollen van de Ooster and Verklikkerplaat situated in the Voordelta are designed to allow at least 200 common seals to inhabit the entire Delta. Here, they will be able to raise their pups, thus meeting objectives set out in the Voordelta Designation Decree.