....said Daeschler, curator of vertebrate zoology "The individual fish found fossilized on Ellesmere Island probably died — along with the Tiktaalik specimen — when a flooding river spilled its banks and left hundreds of fish stranded in mud that later solidified into rock, Daeschler said in an interview." Canada.com 9/21/11
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Considering how things become fossilized-it's a good possiblity that they were smashed and trapped by the forces of the global flood....
.... the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened. Genesis 7:11