BG in the south and north produce about the same number of eggs/offspring just in a different manner. South more spawns less per spawn while north less spawns but more per spawn. LMB in the south almost always reproduce at 1 yr while up north usually at 2. One year less of predation up north can make a huge difference.

Here is info from Penn

Stocking bass-bluegill ponds
When small bass and bluegills of the same age were stocked simultaneously in Alabama, balanced populations always resulted. When this stocking strategy was followed in the North, the result nearly always was a stunted bluegill population and a bass population unable to spawn successfully. Research at Cornell University showed that to achieve successful bass-bluegill populations in northern states, the initial stocking must consist of bass that are at least 1 year older than the bluegills. This can be achieved by stocking yearling bass 1 year ahead of yearling bluegills or combining 2-year-old bass (over 6 inches) with yearling bluegills less than 2 inches long. Researchers currently believe that the proper number of fingerling fish to stock is 100 bass and 200 to 500 bluegills per surface acre. This stocking strategy has been shown to be successful in Pennsylvania ponds.

Last edited by ewest; 06/21/17 08:54 PM.