We had a very small pond in our garden back in the UK. It had fish in it at one time until a heron decided to call for lunch. There were, however several large frogs in residence which would cover the surface of the pond with spawn each year.
Yesterday, when I cleaned the pool, I found a frog in the water. He or she must have thought it was the Hilton with so much space to swim in. Without plants and cover though there was no where to spawn.
I quickly evicted the frog to the garden and added a couple more 4 in 1 tablets to beef up the chlorine levels. If the perisher decides to return I may have to evict it further away.