AquaBlox in the "pond" and cover with a water feature. This will raise the feature so nothing falls in, but still allows the lizards, birds and other critters to get a drink. Also, we use Aquascape water treatments to keep the water clean and clear all year long. Check out this Aquascape website for more information, ideas, and find local Certified Aquascape Contractors in your area. www.AquascapeInc.com

loss. Blue herons are notorious for stealing fish. Once they find your pond, they will continue to return until their little fishing hole is empty. All of the above ideas are great ones, especially the fishing line and rope around the pond. We have also used fake heron decoys around the pond, as well as motion sensors. One product we have found to be the best is "The Scarecrow". It hooks to a garden hose and is motion activated to shoot an arc of water across the pond, scaring anything away (herons, raccoons, deer, cats, etc). As for raccoons, they can get large fish as well, but you will normally see remains around the pond. Also, they will not swim and will only wait on the side until something swims by to grab. Same goes for cats. We have had people steal them in the area, but in these cases, it's usually all at once and not spread over multiple days. I am terribly sorry for your loss. It is hard to lose any fish, but especially older ones that you've grown attached to. Good luck!