During the fall in Mobile Bay the multitudes of fish are all there for one thing. Shrimp! The Mobile Delta, which pours into the head of Mobile Bay, is a rich estuary that white shrimp use as a hatchery area. As these shrimp grow and leave the Delta headed south towards the Gulf of Mexico, there are plenty of fish waiting for them in the head of the bay. Since shrimp are so abundant they are the obvious bait choice.