I hope you realize that the shipping container would need to be a minimum of 6 foot dia round tank for a blacktip of around 30 inches. It would also have to cover the shark by several inches. These are not hardy like a blacktip reef. They need to constantly swim with very very little down time. You are talking about a couple of hundred dollar setup, probably at least $500 minimum plus a truck rental. You would also need the same container on the ship deck with pumps to add fresh seawater. Even with the right setup these are very difficult to transport.
Here is a schematic