Fish, Tanks and Ponds

Fish, Tanks and Ponds
A comprehensive guide to fish


Ryukin Ryukin


China, there are historical documents which date back to 1770 which indicate the ryukin first appearing in Japan.

Special features

The hump which starts immediately after the head.


  • Temp - 65 to 70°F.
  • Ammonia/Nitrite - no trace.
  • Nitrate - preferably less than 20ppm.
  • pH - 7.5
  • GH - avoid extremes.
  • KH - 5 to 12.

Ryukin are quite robust and healthy. Their extreme body shape means that they could be prone to issues concerning their swim bladders but this can be minimised with good breeding, a good diet and relatively shallow water.

Ryukin can grow in to quite large fish which can reach 8 - 10 inches (20 - 25cm) so they will need a suitably sized aquarium to house them.

Goldfish are omnivores with a slight preference for vegetable matter. The main thing when it comes to feeding them is to ensure they have a balanced diet for healthy growth and resistance to disease. Their mouths are slightly down-turned and it isn't natural for them to feed at the surface and it can lead to swim bladder and other digestive problems if they are forced to, so ideally all dried food should be pre soaked prior to feeding so that it will sink. Suitable food

  • Pellets preferably sinking ones Algae wafers
  • Pre soaked flake food.
  • Lettuce, cooked Peas without their skin, Brown Bread
  • Live or frozen Bloodworms, Adult Brine Shrimp, Daphnia.
  • Freeze dried Tubifex.

If you go away on holiday rather than risk someone with no experience feeding them it is better if the fish are left without food.

For a healthy Goldfish to go two weeks with no food will do no harm at all. Being cold blooded their food requirements are far less than an equivalent sized mammal but the risk of over feeding poses a very real threat to their lives.

Ethical note

Ryukin are generally quite healthy and robust. They are not strong swimmers and can't compete with more normal fish, their long finnage does not do very well in very cold conditions so they are not really suited to life in an outdoor pond and should only be kept in an indoor aquaria.


As of yet 2014 there are no set British show standards for the ryukin goldfish below are the American show standards for the ryukin..

  • The body is very short and egg shaped.
  • Depth of body to be greater than 3/4 of body length
  • Dorsal fin should be 1/3rd the depth of the body
  • Caudal fin to be 3/4 to 1 1/2 times the body length moderately forked and divided for 90% of its length with rounded lobes.
  • The pectoral, pelvic and anal fins are paired, of moderate length and well matched.
  • Minimum length of body to be 5.5 cm (2¼ inches)

Other areas of judging include:

Fish will be bright, alert active and well balanced.


Metallic varieties: Red, red/white, pure white, greenish, blue, calico and chocolate.

Nacreous varieties: Solid red, bi coloured, tri coloured and Calico.

Points system

  • Body 20
  • Colour 20
  • Finnage 20
  • Special characteristics 20
  • Condition and deportment 20
  • Total 100

Red Ryukin
Red ryukin



Samurai Goldfish

Exotic Goldfish