It had two four inch common goldfish in it. It had no filter, no substrate, no aeration and only a few ceramic decorations. We recently had an opportunity to visit the home of a young couple with some small kids. Any other fish would be dying from oxygen deprivation at those stocking ratios. Hundreds of fish in a tank with all being healthy, active, swimming well, and apparently “thriving”. One only look to the feeder goldfish tank at the local fish store to see that this is true. They will thrive under very poor water conditions in incredible crowding. It’s been doing just that for more than 1,000 years! The common goldfish is the best beginner fish there is. It thrives in crowded polluted conditions. This “inadvertent selective breeding” has made the common goldfish unique in many ways. ![]() This is called “inadvertent selective breeding”. Each generation of goldfish was selected by their environment, with only fish capable of surviving in that environment surviving to pass on their genes. The conditions in those earthenware and ceramic containers were very crowded and very polluted. The Chinese keepers of these fish knew nothing about filtration or the nitrogen cycle. There were thousands of these bowls used in early China for admiring goldfish. This bowl is about ten gallons with no filtration and no aeration. This is a photo of a typical Chinese goldfish bowl: Chinese goldfish bowl The common goldfish has been bred in small earthenware and ceramic containers in China for close to 500 years. The common goldfish has been kept in overcrowded ponds under very polluted conditions for over 1,000 years in China (Some folks claim 1,700 years). It is the fish given away by the millions in fairs all around the world. This is the “feeder goldfish” found by the thousands in a tank in your local fish store. Some call it the “narrow bodied goldfish”. The common goldfish is a fish with a single tail and a sleek body. ![]() This dimorphism has led to a lot of confusion when it comes to goldfish. Genetically dwarfed goldfish have significantly shorter lifespans than common goldfish. They are inbred and genetically weak and need different conditions than narrow bodied goldfish. very round.įancy goldfish are completely different fish than the narrow bodied goldfish. Fancy goldfish have a genetically induced very short spine which result in a body shape best described as like a golf ball, i.e. “Fancy goldfish” or “wide bodied goldfish” are more properly called “genetic dwarf goldfish”. They can live to be 20 or even 30 years old. These fish are easily kept under many different conditions, including overcrowded, small tanks with poor water quality. The common, sarasa and shubunkin goldfish are one type of goldfish, which some call “narrow bodied goldfish”. There are two distinct types of goldfish.
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