Whats the most durable fish?

feeder goldfish. they are used to the worst conditions on earth since they are raised to be fed to dedicated piscivores that can only eat live fish. when i buy them i buy like 30 or 40 at a time and i just dump them into the 5 gallon plastic bait bucket, then i take a hose and hose some cold water into the bucket. and they actually usually all survive.