Mr. John Brattey at the Fisheries and Oceans Committee

I'm not sure whether that could be done or not. I know that certainly one of the primary things they use are the otoliths, the fish ear bones, in the stomachs, which allow them to reconstruct what the seal has consumed within the past 48 hours, say, because the ear bones are very slow to digest.

With regard to the historical information, I'm afraid I don't have the answer to that.