I use a pump on every fish I bonk. It's called the heart. The heart of a fish has considerable automaticity, which means it's less regulated by the brain than ours, which in turn means it keeps beating for several minutes after you bonk the fish. I've seen catfish hearts beat for 30 minutes in a dead fish! If you immediately cut a gill arch after bonking a fish, the heart will pump out most of the blood, especially if you milk the back of the fish, letting gravity be your friend. You don't get every drop, but I don't think it really matters. Catching a quality fish, bleeding it how you choose, and getting it on ice asap matter more.
Interesting videos though.
Only one problem.... the heart will only work until there is no longer sufficient blood pressure to sustain venous return back to the heart. That happens in about 10 seconds.
At that point the bleeding process relies 100% on gravity. Residual blood volume will naturally pool in the most dependent (lowest hanging) portions on the intravascular space.
The most strategic way around that is to hang the critter such that the blood-letting wound you make is most dependent.
Making a second wound at the opposite end of the vascular space will facilitate gravity-based flow. Stam popularized this a few years ago.
Think shot-gunning a beer.
http://www.piscatorialpursuits.com/forum/ubbthreads.php/topics/658843/1.html
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