The appropriate number of boxes and heavy polyethylene bags, depending on the size, compatibility of the fishes, and the length of their transport should be used. Small 3 cm long schooling fish, for example, could go together in one large bag while larger or more territorial fishes may need to be bagged separately. As a rough guide, one box can hold about fifty 2 cm long fish, or five 8 cm long fish, or one 25 cm long fish. Obviously, different species have different requirements, so good judgment is important. If in doubt, one should lean toward packing conservatively. Most fish shipping containers are of a standard size, 15" x 15" x 7" high. They can be ordered from a variety of sources (see Table 1).