Cecil, some are made completely out of iron/steel and the sheer weight drives them into the fish.

Bullhead, what lake? They spear esox too I believe.

There is a pretty big collectors market in fish spearing decoys. I have a couple sitting here on a shelf.

www.hoosierpondpros.com

[Linked Image from lh6.ggpht.com]
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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).