Numbers would be small at first...not everyone can be a commercial fisherman, just watch Deadliest Catch once and you will know.
But as I have said, I would form Training Cadres to ever increase the number of available fishermen/sailors. Of course the same for boats of course. I wont simply be able to field 100 boats with 5000 people as crew to feed millions. :P
But the part I am having problems with is the math. Based on the rules, and game experience, does the math I posted a few posts up work for most people?