I have never done this before, but my garden is so big I do not need any more vegetables so I chose fish farming to be separate from fruit & veg. farming.
When I get a new battery for my camera I will show some of the progress so far. I found it far cheaper to dig a hole & purchase "pond rubber liner" to create a hygienic "tank". Along with" water hyacinth" & other plants to keep the water healthy. I think the pump will be the most expensive one off cost I will have to bare.
If you have built ponds like the one I am in the process of doing, I would really like your input.:)