I prefer to ship my fishes using shipping company. But you need to know that The box you choose is important. In most situations (or perhaps more accurately in nearly all situations) the box should be insulated. If not a fully insulated Styrofoam box, some sort of insulation should be provided. The rise and fall of temperatures during the shipping process is very harmful for most animals...humans too. It's the equivalent of walking in and out of air-conditioned building into the hot sun over and over or flying in an airplane with the cold air blowing on your neck. Mitigating the changing temperature is important and insulation is the best way to do that.
