question on grinders

I am looking to make some fish patties.I will be looking for a manuel grinder is there grinders [u]one for fish and one for meat[/u]?Or is there different size blades? If there is what size should I use? Once I catch some suckers and try out the patties I will let everyone know.First I need to catch a few suckers.I only caught a couple when I was trout fishing and that was by accident. Charlie