Toads Tadpoles and Frogs
Frogs are welcoming to any pond, with the different sounds of croaking. Toads are definitely not welcoming especially during mating season. Frog eggs and toad eggs can be easily distinguished. Toad eggs are laid stringy and Frog eggs are laid in clusters. Toad tadpoles are totally black and secrete toxic poison.
If the Toad tadpoles have hatched out in a pond, usually hundreds, signs of stress will be seen in the fish and will die within days. Scoop the toad eggs out as soon as possible.
Most frog tadpoles are harmless, but there has been many times where waterlilies have been eaten by hatch ling of hundreds of tadpoles devouring the soft crowns and stems and leaves. Some fish will eat frog tadpoles and will minimize the problem.