So I have two ponds. One has fish that are over 10 years old. The other has fish that are about 3 years old. My husband said he saw a Heron in the neighbors yard. Thinking I should protect my big fish, I put a net over it. It worked. I didn't net the small pond. It ate my fish. My boss said Heron are protected and I can't hurt it. I bought a decoy, because apparently they wont come to where a Heron already is. I guess I buy more fish and a net to cover the pond. Bummer