I stupidly returned a lovely looking pike when salmon fishing.Getting a rapala out of its mouth without forceps resulted in my hand and wrist being cut to ribbons, and yes, it didn't stop bleeding for quite a while! I can't see why a pike should have anticoagulants in its mouth though, it doesn't bleed its prey to death before swallowing.If you wait too long when a pike takes hold of your bait it has turned it and swallowed it down, alive and kicking, and although I catch a few pike damaged trout they haven't bled to death.Old wive's tale I reckon, but maybe the huge fish that occasionally drag drinking cattle into the depths have anticoagulants on their fangs.