The Lough Derg trout used to be (maybe still is) in the Natural History Museum in Dublin but was discredited as a record when modern scale readings showed that it was, in fact, a salmon.
The pike record that SB refers may be that of a 56lb fish caught from Lough Conn on 1922-ish by John Gavin. The fish was reputed to have a 10lb salmon in its stomach. Gavin also boated an 11lb brown on the same day. Not a bad session
Due to the political situation in Ireland at the time which was affecting the transport system, it proved impossible for the captor to have the fish ratified in Dublin although it was weighed on shop scales and scale samples were taken. The head and jaws are still around somewhere, maybe again in NHM in Dublin