It doesn't mean anything. Dreams are dreams. If you're trying to have a baby or talking about babies, or if anyone you know is having a baby- it's logical someone has a baby dream.
Fish...when someone dreams of fish that usually means there is a pregnancy on the horizon or that has already taken place. lol. If your not already pregnant then it may just be what he wants in the future. But when the fishy dream comes then i would get excited...my grandma dreamed of fish before I told her I was expecting :)