I've only been fishing in that area around Thanksgiving as well, so I'm not sure what to tell you other than ask the locals. It might be worth sending Snookn21 on here a message as well; he's a vendor on here that lives in that area & goes fishing around there.
I would try to pier on Sanibel Island if you get the chance, though; I've caught various fishes there (skates, catfish, snook, etc.).