Read my post again NC. The difference is that non fishing occupants on the boat ALSO have to have a SFL, and (according to the law) so do their children of ANY age.
And so does the tourguide/boat captain. In the many states of the US I have fished yes you need a licence, but only the fisherman not his non-fishing wife and kids. THATS the big deal. Land tax has nothing to do with it. The American and Canadian fishing guests we get down here don't pay land tax as they don't own property in Belize.