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Sorry to burst your bubble, but liopleurodon wasn't a fish, it was a pliosaur. It was a reptile.
And I'm also pretty sure that Liopleurodon was not the biggest creature ever. I'll look it up, though.
I'm not trying to rain on your parade, but I use my paleo-geekiness whenever I can. 
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Yea, i know it wasn't a fish, but it is frickin cool.
According to the Discovery Channel (huzzuh), Lipleurodon was the 2nd biggest creature to ever live, with the Blue Whale being the 1st.