Prehistoric oceans inhabited by giant fish

Let's entertain the idea that if the earth was originally about 2 to 3 times bigger then it wouldn't be surprising that it was populated by giant fish and mammals. It would make sense. I believe something collided with the earth and knocked off a huge chunk and then it was smaller. So, all the huge mammals and fish became extinct and the earth repopulated with smaller mammals and fish and so forth. Anyone of the same thoughts?

Another article with more of a personal view on the find, in regards to the family in Kansas. http://www.kansas.com/2010/02/18/1187588/ancient-giant-fish-uncovered-in.html

didn't see anywhere how big they are believed to have been?

Bridge the gap between Mammals and Fish??? Whaaa..... I thought the difference between fish and mammals was bridged by amphibians and reptiles???

didn't see anywhere how big they are believed to have been? Twenty to twenty-five feet long.

Let's entertain the idea that if the earth was originally about 2 to 3 times bigger then it wouldn't be surprising that it was populated by giant fish and mammals. It would make sense. I believe something collided with the earth and knocked off a huge chunk and then it was smaller. So, all the huge mammals and fish became extinct and the earth repopulated with smaller mammals and fish and so forth. Anyone of the same thoughts? Ermmm....in a word....No. What evidence are you basing your 'belief' on?

A time machine and a fishing rod.....its all I ask...

Let's entertain the idea that if the earth was originally about 2 to 3 times bigger then it wouldn't be surprising that it was populated by giant fish and mammals. It would make sense. I believe something collided with the earth and knocked off a huge chunk and then it was smaller. So, all the huge mammals and fish became extinct and the earth repopulated with smaller mammals and fish and so forth. Anyone of the same thoughts? Large animals could survive back then because there was more oxygen in teh air to sustain them. It has nothing to do with Earth's mass.