SPLISH SPLASH: You know how to locate a migrating whale in the distance — a huge fluke is a pretty clear indication you’re beholding a beautiful behemoth, or the tell-tale puff of salty spray — and the boisterous barking of seals lets an ocean enthusiast know that playful pinnipeds are in the immediate vicinity. How, though, can a person know when a mermaid is near, that marvelous and mythical wonder of the deep? That can be a bit challenging, unless you find yourself coming ashore in Ventura Harbor Village on a couple of select and especially ensorcelled dates. For March is Mermaid Month around the shop- and restaurant-lined attraction, and while mermaids won’t be calling upon the village every day, you will have a few…..