With crawfish, as long as you're transplanting a species native to your area, I don't know why you couldn't. Importing something like Louisiana mudbugs would probably be a no-no, tho.
.10 surface acre pond, 10.5 foot deep. SW LA. The epitome of a mutt pond. BG, LMB, GSF, RES, BH, Warmouth, Longear Sunfish, Gambusia,Mud Minnows, Crappie, and now shiners!!...I subscribe!!
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