Koi

Koi are a favorite with fish ponds around the world. These colorful fish are ornamental varieties of domesticated common carp (Cyprinus carpio). the Prussian carp (Carassius gibelio) were first bred for color mutations in China more than a thousand years ago, where selective breeding of led to the development of the goldfish. The obvious problem in taking pictures from the air into water is the reflection of the water surface. A Polaroid filter will make the water appear more transparent by eliminating the surface reflection. Eliminating reflection does not always make a good photograph, however.