More oxygen around the shell beds
Plankton

When searching, look for current.
High spots along channel turns SEE PIC

Shallow ones are also there but harder to find. SEE PIC 6

Example of hard to find shallow shell beds SEE PIC 7 and 8

Can catch them year round.
Water temp 65 and above is best time

Clearer the water, the deeper the shell beds that are in play.
Wind will position the fish
Days leading up to the day you fish needs to be studied.

Falling water is best time to fish them

Use Jighead worm
Crankbait
Carolina Rig with soft jerk fluke