Good idea Theo - that's what I rudely had constructed in my mind. My obvious problem is my ponds I've chosen for reproduction are NOT conducive to seining - just wanted something more aesthetically appealing and knew I'd have to deal with issue of fish collection later. Pretty - but not practical.
I like the idea of a fish corral and either netting or electrofishing them at that time. I will look for Ewest's diagram - thank you!