Orient style has different sizes, not standardized. From farm prepackaged and ready for shipping. Transports own boxes, others' boxes, and often meets other farmers at airport. Usually about 50 items sent out. There are middle men dealing with farmers and breeders.
Some large farms can deal directly with the exporter.
Variety with consistent quality are essential. Volume is the benchmark of success in fish farming. The fish business is a team effort between the buyers, sellers, breeders, agents, and finally the airlines. Talk to breeders, Read books. Travel to fish shows.