Sometimes you get fish shipped to you especially in the warmer months, or if the bags are over packed, or if there has been a delay, and the bag is a disaster. If fish are dying in the bag, it is advised that you do not go through any lengthy procedure to get the bags emptied. Immediately open the bag, remove the dead fish and begin copping water from the receiving facility into the shipping bag. When you have achieved a 50% mix, and observing the temperature change liabilities in the picture, you need the fish out of the bag into the receiving facility. Rapid acclimation is stressful, staying in the bag is fatal.