I personally don't like giving the fish a headache so I just take the knife to their gills every time. Then I hold the fish upside down in the water and when blood stops coming out I start flexing the fish like the way it would swim so as to pump more blood out. Then finally I squeeze the fills between my thumb and index finger trying to get out every last gram of blood. I know I've done all that I can when the gills look light red/pink to white. After all that in the cooler it goes. Usually I will end up with some blood seeping out on the way home.

Awesome! Plenty of ideas to play with. I'll have to try all the different techniques you all have suggested and see which one really does get all the blood out, esp the spinal blood. I especially like the really savage methods, particularly ripping the gills out with your fingers. I like my bloody satisfaction. Got another question, do your guys' egg skeins still have blood in them after you bleed the fish?