From someone currently fighting a very simmilar issue, you should listen to jakeb. I wracked my brain trying to figure out what was going on and how to improve the pond overall. What i came to find out was that i didn't have near enough info to base a plan of action on. Need to survey a big portion of the population.
My documentation is growing....just creel data, no electro-surveys just yet, but we'll see.
Good luck with your skinny bass problem. The giant wonky heads are creepy - especially when the head is way too big, and it looks like a fish skeleton with scales on it. I call those the skeletor bass.
