The link below will take you the the North Atlantic Fisheries Organization (NAFO) site, where you can download the following papers:
Hammill, M. O. and G. B. Stenson. Estimated Prey Consumption by Harp seals (Phoca groenlandica), Hooded seals (Cystophora cristata), Grey seals (Halichoerus grypus) and Harbour seals (Phoca vitulina) in Atlantic Canada. in: Journal of Northwest Atlantic Fishery Science - Volume 26 (2000).
* n.b. - almost all of the NAFO online documents are in PDF format - if you can't view PDFs....get with it.