I have kept a few scuds in buckets for a few days.

With no weeds or mulch they go a long time with out air, but with food in there it seems like it goes "Sour" real fast.

I havent kept any to try and culture them but that looks like fun too. I want to try and identify some of them.

Only places I know of local populations are in the creeks, non in ponds

Water is the basis of all life, by design!