I guess if they have babies (I did see them mating that one night), I'll need to separate them. I'll probably move 2-4, maybe 5 (or is 4 or 5 too many?) into the 3.5 gallon aquarium I have as a backup thing. They'll eat each other otherwise! The rest, I'm not sure. They can have a lot. I'll just put them back where I found them. It is one reason I got them from the river, instead of buying any (and why I won't buy any until we live in a permanent location, not an apartment). Its also why I don't want to drive around and get other different species. I don't really know what I'd do with a whole bunch of crawdads in a 10 gallon aquarium and no space for a 20 gallon. Not really a big deal to put them back. I guess if they are invasive, putting them in an area where they aren't found would obviously be bad. Otherwise, they'll just go into the pond where there is already a bunch living there.
Unless that is an issue? To me it seems like getting Argentine ants, and then putting Argentine ants back in the same place. There is already a lot of Argentine ants where I would put them back, so not really a big deal. It would especially be a big deal if I put them back and the Argentine ants died or/and were replaced by other ants, or I took them to an area where they didn't live. But I obviously wouldn't do that.
Otherwise, I plan to eventually keep the two adults and then 2-4 (maybe 5) baby ones (if they do end up with babies). Supposedly, the baby ones are a lot more interesting and fun to watch and someone on one forum said he tamed his (not sure what he meant by that? But, sounds strange heh.)
When people raise them, what do they usually do when the male/female makes a bunch of babies? Do they keep them all and if so how does that work out? They are really territorial, so not sure how that works. Assuming giving them away isn't an option, since I only have one real life friend and he lives far. And my family aren't into that thing, except MAYBE my cousin.
Though the two I have don't have any aggression at all, even in the small aquarium they were in. They act very friendly to each other! Act rather friendly to me to actually, not really aggressive. The first one I had, was very aggressive. The two I have, not so much.