how many fish are we talking about? what type of fish? How big?
I'm going to have to transport some fish soon. It's pretty cold here. Should I put them bagged in a cooler to retain heat? Would putting a hot hands pack in said cooler work or too risky?
purge fish of food for 2 days prior to transport. Put them in a bucket with a battery powered airpump and airstone to oxygenate the water. Fill the bucket with clean water conditioned water. They should be fine for 5 hours..just make sure the heat is on in the car. If the temp inside the car is 75-80 your fine. Not all fish store use heaters in each tank, they just keep the heat at 80
a battery air pump is $10 at petsmart. this will also come in handy if your power ever goes out at your house
IMO the bucket with battery powered air pump is easier for a 5 hour trip. They will also benefit from the oxygenated water compared to a bag. Just keep the temp inside the car up and they will be fine. Not feeding the fish for 2 days before transport will help keep the ammonia and waste down