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As Sunil referenced, oxygen is what you need. A large Igloo, a small O2 bottle with a regulator and flow meter, and a small Point Four diffuser will easily handle a long haul. Aquarium tank stones don't work as well. If you figure out the square footage of the cooler, the fisheries should be able to tell you how many fish can be carried. The numbers will differ depending on size and breeds.

Here's my small rig, and it's been a life saver several times. The black ring in the lid is a vent, and the whole rig can be easily carried.