SherWood, I seem to recall that the Floating Island folks had some success building habitat protecting FHM. At least, this was hinted at not too long ago. You might inquire with Bob Lusk.
I myself have purchased a large fish cage and used it to house CNBG that I later stocked in my forage pond. Wonder if 1/4 or even 1/2 inch openings would work, especially if FHM spawning surfaces were placed in the cage. Would need to keep out coons, turtles & herons as well as predatory fish.
Yup, whatever I would do, I'll have to keep varmints out, including my ducks. If I am going to raise FHMs, I will have to use something that's big enough to house some structure for them to spawn along.
