mink in pond
I had an overpopulation of fish in my 1500 gal pond and I was having no luck in catching some to reduce the numbers. Nature found a way. A mink showed up yesterday and I've found 4 carcases of smaller shubunkins and my 4 largest koi (14") have disappeared. There is a cave and lots of lily coverage but I fear the worst. He comes and goes with impunity, even swims around when I'm watching helplessly. I've baited a live trap with tuna, to no avail (so far).
Any suggestions would be appreciated.