There should be other ways in exterminating or raising a port population other than using voodoo cards.

For exterminating, I suggest that bombarding the port to kill some of its population. But, doing so, increases the players' hostility in the nation that's controlling/governing the port. Also this is the reason why players needs to build up the port to gain influence. Bombarding also increases the danger rating of the fleet so that the Marquees of the nation should be able to defend the port or counter the bombardment.

For raising the port population, ships can also transfer citizens from one port to another by the same amount as their cargo. 1:1 ratio I guess.

Opening the link will do you no harm.

http://s2.piratesglory.com/promo.php?id=38872

It's a trap That was close
Ship transfer citizens idea sounds like human trafficking to me .. And it'll be unfair to nation port whose citizens are transfered because citizens contribute tax, you know. There'll be transport war between nations and the nation whose players have a lot of trade fleets obviously will dominate (I'm reffering to Capt. Da Vinci and Capt. D). Imagine 1000 ships of (for example) Barbados spread over Avonmora and take them to their ports. They'll be richer and deplete other countries' source of wealth. And the main idea of population control cards usage in missions is to make people buy them. If your idea of bombardment is implemented nobody's going to use the cards. Better lose gold from plunder because of DR than cost a lot of credits to accumulate them from auction or buy packs. It's a bless they're still Common cards.

Raid, pillage and plunder!
+1

I clicked it thinking it was something else good thing is that the link does not actually do anything but annoy you.

We are pirates! So may be label it Slave trading?

Nice idea. It needs more input but this is something among our own ambitions as well and deserves more attention.

Not sure if this could be still relevant with current metrics, but so far am voting to discussion.

Need to think this one over longer.

As we already can move population via ships, one can take from one port and deliver to another, and of course, plantation.

This said, the process is slow, given the massive populations in ports.

The bombardment of a plantation or port is a natural addition.

This would naturally lead to forts, blockades, etc., which at the moment would only affect trade.

+1

Using warships against a port may open the path to more interesting port wars indeed.

+1 to the general idea, could be explored better.

+1
Definitely, I think it should be possible to attack a port with warships, as well as with voodoo. I also think that the port should be able to defend itself and attack unwanted fleets in its harbor if desired. Diplomatic relations with the country that holds the port should also factor in. Fleets from nations at war with the port's nation could be attacked automatically (maybe like once an hour). This could be from NPC fleets, or....
Here is a really new idea. Why can't ports build fortifications? The port could have a screen (the same way a hideout has) and build things like ramparts, cannon turrets, powder magazine, musketeer barracks, cannon foundry, etc. These improvements could be funded by the nation that controls the port or the Governor.