Back to profile Contact person for... - ing. IJ (Ingeborg) de Boois Pages Ecological monitoring and data Since the 1970s, Wageningen Marine Research has gathered data on the Wadden Sea, the Dutch delta, the North Sea and national freshwaters in the... Ecological monitoring and data Since the 1970s, Wageningen Marine Research has gathered data on the Wadden Sea, the Dutch delta, the North Sea and national freshwaters in the... Beam Trawl Survey (BTS) Every summer, Wageningen Marine Research carries out a Beam Trawl Survey in the North Sea on the Tridens research vessel. The primary aim of the Beam... Product or service Research Ships A lot of our research takes place onboard research ships, owned by the Rijksrederij of the Dutch government, fellow institutes or by ourselves. Otolith analysis The age of fish can be determined by studying their otoliths. Similar to trees, otoliths have annual growth rings. In addition, based on the size of...