Which is better for a blue heron to catch fish, water visibility of 6 inches or 24 inches? This may be the wrong place to ask the question but I thought I would give it a shot.

The reason for the question. A few years back I stocked 50 bass. A few years later when draining the pond I found only 3 bass (I took none out). Water visibility was 6 inches or less back then. Now, my pond is re-done and just about full with the visibility about 15 inches and getting better every day. I'm stocking 50 more bass next week. Will they be easy pickings for the herons or will the fish be able to see the herons better?

And yes, I'm pretty sure the herons are the problem. My pond is about ~ 300 feet from my house and no one fishes but me and the herons.