Why have fish ponds become so popular?

In Japan koi are a symbol of good luck, prosperity, and health. Watching fish swim around their pond is soothing and peaceful. Also, water gardening is becoming more popular with many gardeners wanting a backyard pond to enhance their landscaping. Koi ponds are the ultimate ponding experience. What does a Koi pond cost? Koi ponds need to be larger and deeper than water gardens, a minimum of 1,000 gallons and 3 ft deep to allow koi room to grow and to deter predators. Larger ponds & filter systems are a must for show quality koi. Smaller ponds built by DIYs using plastic liners can be completed for $1,000.00+. Large professionally constructed concrete ponds can cost $20,000.00+. Koi ponds must have a special large filter system operating 24 hrs per day with total pond water volume turnover every 2 hours minimum. Smaller preformed ponds & kits sold at Lowes & Home Depot can be used for goldfish ponds. How much maintenance? Maintenance depends on pond/filter design. Properly designed/ ...  more