I'd like to see an 8" crayfish too!

Instead of gasoline, I'd try some hydrated lime in the hole. Might change the pH enough to make it uncomfortable or unlivable to them.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).