So that means that bait balls are where the fish are? And that can mean lots of bait balls where a concentration of fish are, and less of them where less fish are?

Duh.

I was wondering if certain places had more due to bottom structure, currents and the like.

Rob
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Give a man a fish, and you'll feed him for a day; give him a religion, and he'll starve to death while praying for a fish.