In the 1976-1986 period Branchiostoma lanceolatum was widely spread outside the near-coastal zone and reached densities of 600 ind./m2 maximally in that area. In the 1994-2001 period the distribution of the species was remarkably more limited and lower densities were observed: B. lanceolatum was exclusively found near the Hinder Banks in densities of maximum 120 ind./m2.
- Degraer S., J. Wittoeck, W. Appeltans, K. Cooreman, T. Deprez, H. Hillewaert, K. Hostens, J. Mees, E. Vanden Berghe & M. Vincx (2006). The macrobenthos atlas of the Belgian part of the North Sea. Belgian Science Policy. D/2005/1191/3. ISBN 90-810081-6-1. 164 pp. http://www.marinespecies.org/aphia.php?p=sourcedetails&id=9234