That's a great question.
Certainly, a fair bit of it relies on co-operation between countries. It depends. If the vessel is within your own waters, I think you have much more that you can do, obviously, than if it's outside your waters.
We do increasingly have tools. Using AIS and satellite surveillance, you can tell where ships are and whether they're conducting what looks like fishing activity. You can flag that ship and identify it for follow-up, including when it goes to ports, both when it goes to your own port or to other ports. These are tools that help us with enforcement, but the ocean is so awfully big and spread out. We get better at it, but that's obviously going to be a continuing challenge.