What I can tell you is this: When you get one, get it back in the water ASAP and keep fishing!. From my experience, when the fish turn on, they turn on! You may see nothing for hours, and then for 10-20 minutes you're getting hits, boils, agressive follows, landing fish etc. The sad part is, as quickly as they turn on, they turn off. What causes them to turn on like that? Even if I knew I wouldn't let that little gem out of the bag :D