Pond Boss Forums GENERAL QUESTIONS Wildlife Management Hopeful Otter Deterrant

I am new here and pond ignorant but I want to give back where I am getting so much good advice. I cannot prove this works but so far so good, knock on wood. I usually rap myself in the head about now.
About a year after I dug my first pond Otters from the nearby river paid me a visit. I was away on vacation and they wiped me out. At the time I had 34 Rainbows, 2 Browns,6-7 SMBs, 3 big Cats and one Redeye, along with the minnows and Hornheads.They had a feast! We figure it was a pair just from the tracks and slides but not sure. I am sure I was serious mad though. Anyhow I now have solar powered mole chasers all around my ponds. It has been 7 years now and no Otters. They make a animal irritating sound every 30 seconds or so. I have noticed for sure that the wildlife definatly give it the go around just from the tracks. I bought them on sale at Northern supply for about 6.00 each. Buy the solar powered only as i got a few battery powered by mistake and no good. I have a few that have lasted years so good quality for the $.