Does anybody know what this is?

I saw this on Ebay the guy claims it will remove unwanted fish.
http://cgi.ebay.com/ws/eBayISAPI.dll...9000 106&rd=1
I was interested in seeing what it looked like.
I thought that the picture was so ugly, maybe he thought it would make the
unwanted fish jump out in order to not have to see that after the sign gets
taped to the glass.
Further reading says that he's selling his idea for the device. If
that's true how come the quantity available is 78?
Steve