Natural Pond-Is it possible to create a 'natural' pond that provides a complete eco-system for amphibians, plants, insects and fish? This may not always be possible or controllable for the aquaculturist but I will be linking to sites that provide solutions of various kinds.

Crayfish Plague-Its one thing to have a natural pond but what do you do with disease in this disease?

FSI Culvert-Beaver Stop-Prevents beavers from building ponds where you don't want them too. Canada

Solastar-Solar water pumps-Why spend big bucks on normal pumps when the sun can do the work for you? Africa

The Water Pond-Very nice site provides products, news and education on keeping a pond big or small.