Literature
- Carss D.N. and Marquiss M. 1996. The influence of a fish farm on grey heron Ardea cinerea breeding performance. In: Greenstreet S.P.R. and Tasker M.L. (eds). Aquatic predators and their prey: 133-141. Fishing News Books, University Press, Cambridge.
- Carss D.N., 1993. Shags Phalacrocorax aristotelis at cage fish farms in Argyll, Western Scotland. Bird Study 40: 203-211. .
- Krause J. 1999. Analyse der Nahrungsreste im Verdauungstract von Phoca vitulina in Relation ze den tatschlich verfügbaren Nahrungsressourcen. MsC-thesis, Mathematisch- Naturwissenschaftliche Fakultät der Christian-Albrechts-Universität Kiel, 67p.
- Mills D., 1969. The food of the Shag in Loch Ewe, Ross-shire. Scot. Birds 5: 264-268. .
- Steven G.A. 1933. The food consumed by Shags and Cormorants around the shores of Cornwall (England). J. Mar. Biol. Ass. U.K. 19: 277-292.