If you are talking through the ice, I'm guessing few have tried because live leeches typically aren't available in the winter months. I would imagine you could catch them in the summer on leeches but I have never tried or inadvertently caught one on a leech while jigging walleye or perch. We have inadvertently caught a small handful of ling through the ice with maggots on a jig. For best results we use chunks of sucker meat.