Study of the dispersion and dispersal mechanisms of pelagic key species on the Belgian Continental Shelf (BCS). The focus of the dataset is on those species that have a pelagic life-style or have pelagic larvae, mainly clupeidae.\rThe Belgian coastal waters are internationally very important areas for a number of sea and coastal birds. Studying the distribution patterns of the possible food sources (i.c. Pelagic fish) of these birds will lead to a better understanding of their spatial distribution patterns.\rSampling is done with the Zeeleeuw R.V. Underway data is registrated in MIDAS.