>>2440111A cooler plus a cheap sprayer pump, a 12 volt battery, and some sprayer fittings and you’ve got a setup that will keep your fischies oxygenated until you make up your mind on eating them or not. Be sure to replace the water with fresh every now-and-again to prevent nitrate buildup injuries.
Or get a floating “keeper basket” you can put your catch in, just be warned that they might not handle larger fish.