I'll try to link the other thread here, regarding toads. A few breeding from time to time in your pond usually pose no problem. More than that will create a toxic water enviroment. Toads, unlike frogs, have a toxicity on their skin. Fish will eat frog eggs and frog tadpoles, but will not eat toad eggs and toadpoles. They breed differently. Frogs jump in the pond, do their business, and leave. Their eggs float on the surface in a gelatanous mass. Toads "stew" in the water for hours, connected to each other, constantly releasing clouds of sperm, tinkle, and their skin toxins. It's not actually the strings of eggs, but everything else they dumped into the water trying to fertilize those strings. By the next day, the water becomes haxardous to your fish. If you see a large amout of toads in your pond in the morning, do a partial water change after relocating the toads. After a day or so, do another partial water change. I learned about toads the hard way, and lost a whole pond full of 24-30 inch koi. Frogs never a problem, but after all these years, only one night of more toads than I've ever seen (and I always have some) completely did me in. I talked to every koi expert out there, so thought I'd share what I found out with you all!