I never have this problem. Everyone is right. As soon as you get them in club and cut through the gills. My boat has the stern sitting lower and the front up higher, i.e., the fishwells are lower in the back than front. I make sure the fishes head is toward the back or down hill. To do a thorough job of bleeding halibut, cut their gills and one across the tail just in front of the tail fin. deep. For rockcod and seabass, you have to puncture through the aeorta. It is behind the gills. You pull open the gill cover and stick your knife through the skin through the skin right behind the gills. now slash around. Rock cod don't bleed out with the gills cut. I dont know why. Hope this helps.