For Parrack, who has competed at Olympic, World Championship and Commonwealth level, it meant that he had missed out on his attempt to gain European selection - after narrowly failing in two of his three previous attempts since 1989.
All the winners at the trials are guaranteed selection, plus the runners- up if they are inside a qualifying time. Parrack recorded 1min 04.09sec - 1.37sec outside the necessary time.
Parrack, the 1990 Commonwealth silver medallist, came close afterwards to announcing his retirement.
The City of Leeds 28-year-old said: "At this moment I am fighting against the obvious conclusion to be drawn from that swim."Reuse content