Dealing With Crayfish/Crawfish/Mud Bugs

We have many crawfish in the yard. They create the mounds while digging out the holes they burrow. After a rain, the mounds appear, when the yard dries, I use a drag behind my four wheeler to spread the dirt out, and mow after dragging to preserve the life of the mower blades. There is no pesticide recommended for clearing them out, but an old man that lived next door when I was being raised, used calcium carbide pellets. He'd drop one in the hole, and then step on the mound to seal the hole. It worked, but after we found out the gas generated was flammable, allowing the gas to accumulate, and the introduction of a match, would yield a small explosion that delighted. We'd buy calcium carbide, a box of kitchen matches, and spend a good part of the day busy with our endeavor. 

Calcium carbide isn't on the shelf of hardware stores like in the past. It can be ordered, but the days of miner's lamps are long over. My dad rabbit hunted with one on an abandoned airfield when he was young. He said the pale light would mesmerize the rabbits, they'd stop to stare, and end up in a pot. 

So, I just drag the yard, watch the birds eat what they can after a rain, and put up with what some call delicacy.