According the fishing digest link:
"Species: Black Bass
Details: Includes combinations of largemouth, smallmouth, spotted, Alabama, shoal and those species formerly known as "redeye" bass, which are now known separately as Coosa, Warrior, Cahaba, Tallapoosa and Chattahoochee bass, based on their respective drainages. The Alabama bass was formerly known as spotted bass in the Mobile drainage. No more than 5 of the daily creel limit of 10 may be smallmouth bass. See exceptions for shoal bass in specific tributaries of the Chattahoochee River.
Limit: 10
Special Regulations: Guntersville Reservoir and Its Tributary of Town Creek – It is illegal to possess any largemouth or smallmouth bass less than 15 inches in total length"
To me it looks like the limit is 10, only 5 of the 10 can be smallmouth, and on Guntersville largemouth and smallmouth must be 15 inches?