We use the “conk and cut” method. When we land a fish and have it in a grabber, knock it in the head with a billy club, then lower into a 5 gal bucket with water and cut the throat behind the gills with sheers. Be sure to have the fish under water before you cut or it can squirt blood all over the boat

My older brother was a commercial fisherman in Oregon. Buyers would not accept any fish that had not been bled out.