Yes it has been documented that large doses of omega-3 can prolong bleeding (note they said "may"):
There are many studies which tout the preventative effects and there are several that indicate that too much is not good for you as well.
Mega-dosing fish oil might be of value as a curative method but I really question if mega-dosing fish oil all the time would be a good idea.
Poliquin can say whatever he wants, it's up to you to verify what he says. He's not a doctor nor does he hold any medical degree.
His expertise is kinesiolgy not nutrition.
possesses a B.Sc. in Kinesiology and a M.Sc. in Exercise Physiology.
In my opinion 35-45 g of quality fish oil is expensive and is a great method to sell lot of flame out for T-nation
. It's completely your choice to make though