Raccoons!

Raccoon can become a pest if they realize you have fish!  They are brave and clever, deterring them can be difficult.  Try these things to get ride of a raccoon at your pond:

♦  Put in a fish cave for your fish to hide in

♦  Provide plants like lilies and floating lettuce to help hide the fish

♦  Leave your dog in the backyard - raccoons don't want to deal with dogs

♦  Use mountain lion urine.  Yep.  Mountain lion urine can be obtained from many garden centers or on line.  Follow the instructions on the container.  It should deter those pesky raccoons!