Koi Culling Technique

Showa and Utsurimono

  • 7 days old – Keep all kuroko (black fry).
  • 50-70 days old – Discard bad body shapes, white, black, orange, yellow, heads cover black, white , red, black edged pectorilal fins.

Shiro Utsuri

  • 50-70 days old – Keep large white areas, potential good sumi, discard red or yellow spots.


  • 50 – 70 days old – Discard yellowish body, shirobo, light Hi. Keep clear body, translucent shiroji will become snow white skin, yellowish red beautiful, orange Hi will become hi quality Hi.


  • 50-70 days old – Discard shirobo, kurobo, akazukin (red hooded) and zubohaki (wearing pants), hachikuma (black dots on heads), tora (half red and half black). Keep soko sumi (sumi that is faintly visible), sumi shows earlier than Hi, proper sumi, shimmies, tejima (stable sumi, fade without tejima), Hi plateds important.


Blogger KoiLover

Koi Deformations

List of Koi Deformations

  • Gills – Covers blown, short, or outer edge curled.
  • Fins – Missing, angel, or dwarf.
  • Spine – Bent upwards or bowed.
  • Head – Dolphin, bent, too shot, or tadpole.
  • Eyes – Missing.
  • Dorsal Fin – Not continuous.
  • Jaw – Lower jaw deformed.
  • Body – Middle region distended.
  • Tail – Tail area thin, off set, or long pointed tailing.

By Blogger KoiLover

Koi Belly Diagnosis

List of Koi Belly Diagnosis

  • Normal – Like pushing a finger into muscle of upper arm when muscle is relaxed.
  • Unreleased or Infected Eggs – Like poking finger into fat on stomach.
  • Internal Parasite or Bacterial – Like poking finger into fat on stomach.
  • Possible Impaction – Hard.
  • Internal Columnaris or Bacterial – A red anal port.
  • Infection or Toxins Diarrhea – Leaking out of anal port when sides of the fish is gently pressed (fluid indicates infection or toxins diarrhea).
  • Internal Infection – Dumpiness (being short) near the anal port.

By Blogger KoiLover