I've been invited to fish Doctor's Lake and the St. John's river around Jacksonville by friend from that area. He is a bank fisherman and knows little about boats. My question is does anyone know about the salt content in those areas. I am set up to fish freshwater and don't want to ruin my trolling motor/motor with a heavy salt content. Also am I gonna find any crappies in that area, all he talks about are bass! Thanks for any help anybody can provide.