Not the most romantic sounding wedding theme I will admit, maybe one for the boys more... mermaids, fishing rods, aqua and orange colour theme, fishy wedding breakfast, and of course fishtail wedding dress - the best shape for most brides!!
http://www.blog.invitationconsultants.com/
http://www.pul.se/
http://www.seawear.com/
Australia Fashion Week - Mermaid themed wedding dresses
Ocean themed wedding breakfast
Fish and chips wedding breakfast
Fish themed wedding band - from $1345 - 4995
Justin Alexander fish tale wedding dress
(I tired this one, it is fantastic - my boobs weren't big enough to fill the top out though)
http://www.blog.invitationconsultants.com/
http://www.pul.se/
http://www.seawear.com/