Heres the deal. Sharks of all kinds when stressed....i.e pulling out of the water, putting in a cooler, etc, will shoot urea into their blood stream. Anyone who has not gutted them or bled them will notice that it smells like someone pissed in your cooler or on your shark. Whats the best way to prevent this? Cut out the organs that are responsible for sending this stuff throughout the body. Heart, liver, etc. Just take all the guts out of the body cavity. Do it quickly. Cutting the tail off to bleed won't hurt either. After that, your good to go.