It is probably luck of the draw. I picked mine up Friday morning right after they were delivered and most of them adjusted well. (Some were DOA).
HEB was experimenting last year with selling pre-purged crawfish. Not sure how they do it but it might not enhance survival.
If you can get them fresh from the farm it'd be best. There are usually farms wherever rice is grown as crawfish ponds are rice paddies.
4 acre pond 32 ft deep within East Texas (Livingston) timber ranch. Filled (to the top of an almost finished dam) by Hurricane Harvey 9/17. Stocked with FHM, CNBG, RES 10/17. Added 35lbs RSC 3/18. 400 N LMB fingerlings 6/18
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