I usually see Mullet in areas where there is less current, usually near the beach in the swim area, or on the northeast side between the rip rap and finger pier next to boat ramps. A special permit is needed to do anything about Lionfish at the bridge. You are right though, thankfully Lionfish are relatively uncommon at the bridge. Despite the large number of species that have been documented at the bridge (according REEF database, 450, the most in any surveyed area through the tropical western Atlantic), some species are conspicuously absent. Depth is one factor, but tolerance for change in salinity during out going tides might be another. For example, rarely do you see any of Squirrelfish Family represented at the bridge.