Forum adverts like this one are shown to any user who is not logged in. Join us by filling out a tiny 3 field form and you will get your own, free, dakka user account which gives a good range of benefits to you: No adverts like this in the forums anymore. Times and dates in your local timezone. Full tracking of what you have read so you can skip to your first unread post, easily see what has changed since you last logged in, and easily see what is new at a glance. Email notifications for threads you want to watch closely. Being a part of the oldest wargaming community on the net. If you are already a member then feel free to login now.

First address is Deep Wars with a complete undersea skirmish game:
http://antimatter-games.com/products-page/
In the future, they will also rerelease the old Dragonblood fishmen and sea monsters.

Second: Reaper has indeed a lot of marine miniatures, like sea elves, fishmen, aquatic familiars etc.
http://www.reapermini.com/OnlineStore/Aquatic/sku-down
My favorite the Goroloth:


Hordes Minions have some sea creatures big and small, some marine warjacks can be found under Warmachine Mercenaries.




Freebooter Miniatures has some nice pirate/sea themed base decoration like crabs and zombie octopusses:
http://www.freebooterminiatures.de/en/catalog/accessories

Dragon Rune made some OOP Komodons=Fishmen, available a.o. here: http://www.artemisblacks.com/dragonrune/komodons.shtml

Some more fishmen miniature ranges here:
http://www.frothersunite.com/files/rob/Fmsc/Fmsc1.htm