i don't think i'll eat them, but use the small ones as feed for my yp/bg or trout when i go that way..to grow out crays, you'll need lots of room.. i put a few dozen in a 110 gallon tank my first year, after 6 months there were 2 left..
i've got probably 2 dozen in an 8' kiddie pool, and could probably do a bunch more in there, but thats where i want to put my fish to grow..