Shubunkin Goldfish

Shubunkins are single-tailed goldfish developed from selective breeding of Carassius auratus, prized for their calico coloration blending blue, orange, red, black, and white across a translucent base. That distinctive blue is genuinely rare in fish, which is a big part of why they've been popular since they emerged in Japan in the early 1900s. Three main varieties exist: London, Bristol, and American, differing primarily in tail shape and fin length, though all share the same care requirements.

These are big, robust fish that swim with purpose. Adults routinely reach 25 to 30 centimeters, and some pond specimens push beyond that. They're fast and energetic compared to fancy goldfish varieties, which makes them better swimmers but also more disruptive tankmates in enclosed spaces.

In terms of water, they do best in cooler temperatures between 10 and 23 degrees Celsius, with pH kept near neutral and reasonable hardness. They don't need tropical heating, which sets them apart from most community fish. Diet is simple enough: a quality sinking pellet formulated for goldfish forms the foundation, supplemented with blanched vegetables, frozen bloodworms, or daphnia. They're enthusiastic eaters and will constantly forage across the substrate.

That enthusiasm translates to enormous waste output, so filtration needs to be significantly more powerful than the tank volume alone would suggest. In reality, most hobbyists who keep shubunkins long-term keep them in outdoor ponds where they can grow properly and water quality is easier to manage at scale.

They're genuinely rewarding fish with real personality and impressive longevity. Browse community builds featuring shubunkins to see how others have set up successful pond and large tank environments for these colorful, active fish.