Consider, when the time comes, but definitely not now, on creating crawfish habitats in several locations in suitable waters. Do some due diligence research on where and how crawfish live, and set up those situations. A few meat scraps from time to time to get the colony established, active, and vigorous, and regular feeding with additional scraps if natural food sources are not adequate. Just do not overload the waters with the scraps as they will attract other things you do not want and can cause other problems with the waters.
Set the areas up so it is quick and easy to set and retrieve traps.
Kind of a guerrilla small stock farm.
Just my opinion.