GC Koi Farm | Koi Fish For Sale | Pond Supplies

FALL HARVEST 2026

OTSUKA MIX BOWL
From $450.00

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KOSHIJI SHOWA BOWL #1
From $400.00

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MARUSEI MUJIMONO MIX FEMALE
$1,400.00

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TAKATATSU GINRIN ARAGOKE DRAGON SCALE
$800.00

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MARUHIRO MIX BOWL #2 FEMALE
$700.00

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OTSUKA KI UTSURI FEMALE
$650.00

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SAKAI BLOODLINE TANCHO MALE BOWL #2
$800.00

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KANNO KIN SHOWA FEMALE
$700.00

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SAKAI BLOODLINE TANCHO FEMALE BOWL #1
From $1,200.00

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MARUHIRO MIX BOWL #1 FEMALE
$750.00

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KANNO TANCHO SAKURA FEMALE
$1,000.00

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KANNO MIX BOWL
From $700.00

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LOVE TANCHO KOHAKU FEMALE
$1,888.00

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MARUSEI MIX BOWL FEMALE
$1,400.00

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TAKATATSU ARAGOKE MIX
$450.00

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HOSHIKIN KOHAKU
$800.00

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VIEW ALL FALL HARVEST 2026

NOGAMI KOHAKU #20 FEMALE CERTIFICATE
$2,400.00 $3,000.00

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NOGAMI KOHAKU #39 FEMALE CERTIFICATE
$1,440.00 $1,800.00

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NOGAMI KOHAKU #38 FEMALE CERTIFICATE
$1,440.00 $1,800.00

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NOGAMI KOHAKU #37 FEMALE CERTIFICATE
$2,400.00 $3,000.00

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NOGAMI KOHAKU #35 FEMALE CERTIFICATE
$2,400.00 $3,000.00

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NOGAMI KOHAKU #33 FEMALE CERTIFICATE
$2,400.00 $3,000.00

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NOGAMI KOHAKU #29 FEMALE CERTIFICATE
$2,400.00 $3,000.00

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NOGAMI KOHAKU #28 FEMALE CERTIFICATE
$2,400.00 $3,000.00

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NOGAMI KOHAKU #27 FEMALE CERTIFICATE
$1,440.00 $1,800.00

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NOGAMI KOHAKU #24 FEMALE CERTIFICATE
$1,440.00 $1,800.00

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NOGAMI KOHAKU #23 FEMALE CERTIFICATE
$2,400.00 $3,000.00

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NOGAMI KOHAKU #22 FEMALE CERTIFICATE
$1,440.00 $1,800.00

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Why Koi Lovers Choose Us

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Karashigoi

BEST SELLING PRODUCTS

Nijikawa Growth Koi Food - Floating - GC KOI — Nijikawa Growth Koi Food - Floating
From $100.00

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Periha PB Submersible Water Pump with Variable Speed - GC KOI — Periha PB Submersible Water Pump with Variable Speed *FREE SHIPPING*
From $136.00 $170.00

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Koi Sock Nets - GC KOI — Koi Sock Nets
$39.95 $49.95

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Ceramic Bacteria House Round Filter Media 154pcs - GC KOI — Ceramic Bacteria House Round Filter Media 154pcs
$159.00 $199.00

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Nijikawa Professional Food - Sinking - GC KOI — Nijikawa Professional Food - Sinking
From $165.00

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Koi Pond Foldable Quarantine Show Tank
From $299.00 $499.00

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AMAX Submersible Variable Flow AC Water Pump 7925 GPH - GC KOI — AMAX Submersible Variable Flow AC Water Pump 7925 GPH
$295.00 $379.00

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Microbe-Lift Broad Spectrum Disease Treatment - GC KOI — Microbe-Lift Broad Spectrum Disease Treatment
From $24.95 $74.95

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Saki-Hikari Growth Diet 33 lbs Medium Pellet - GC KOI — Saki-Hikari Growth Diet 33 lbs Medium Pellet
$331.99 $399.00

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AMAX BAKKI SHOWER 40 - FREE CERAMIC MEDIA
$1,620.00 $1,800.00

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AMAX BAKKI SHOWER LARGE 60 - FREE CERAMIC MEDIA
$1,980.00 $2,200.00

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API Freshwater Master Test Kit - GC KOI — API Freshwater Master Test Kit
$39.95

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API Pond Ammonia Test Kit 130 Tests - GC KOI — API Pond Ammonia Test Kit 130 Tests
$19.95 $25.00

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EBD4A - EasyPro 4" Heavy Duty Bottom Drain with Air Diffuser - GC KOI — EBD4A - EasyPro 4" Heavy Duty Bottom Drain with Air Diffuser
$229.00 $249.00

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Rhino Retro 2" and 3" Bottom Drains With Diffuser - GC KOI — Rhino Retro 2" and 3" Bottom Drains With Diffuser
From $324.00

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Aqua RDF 20 - GC KOI — Aqua RDF 20
$3,900.00

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Evolution Aqua Cetus Sieve - Pump or Gravity Fed - GC KOI — Evolution Aqua Cetus Sieve - Pump or Gravity Fed
$1,439.99

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per

Savio Compact Skimmerfilter & 8½" Weir Assembly - GC KOI — Savio Compact Skimmerfilter & 8½" Weir Assembly
$348.00

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per

Evolution Aqua Airtech AirPump - GC KOI — Evolution Aqua Airtech AirPump
From $359.99 $399.00

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Aquadyne Rhino II Bottom Drain WITH Air Diffuser 4" - GC KOI — Aquadyne Rhino II Bottom Drain 4"
From $699.00

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KOI BLOGS

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HOW TO WINTERIZE A POND: FALL POND CARE

When fall arrived and winter is around the corner, there's more than just your home and garden that needs preparing. Your koi pond also beckons for some attention. Just as you would winterize your home's plumbing, a koi pond too needs winter care.

A COMPREHENSIVE GUIDE ON HOW TO QUARANTINE NEW KOI

Are you planning to introduce new koi to your pond? Quarantining your new koi is crucial to ensure the health and safety of your existing koi population. In this blog, we will discuss the importance of quarantine and provide you with a step-by-step guide on how to properly quarantine new koi.

koi fish pond with plants in the background

SPRING PREPARATION FOR KOI POND

After a cold winter, preparing your koi pond for spring is an important step to ensure the health and well-being of your koi fish. Here are some tips to help you get started:

HOW TO TELL IF YOUR KOI ARE MALE OR FEMALE?

Determining the gender of koi can be difficult, especially in younger fish. However, there are a few physical characteristics you can look for to help identify male and female koi:

HOW TO TREAT KOI ULCERS

Koi ulcers can be caused by a variety of factors, including bacterial infections, parasites, or physical injury. If you notice an ulcer on your koi, it's important to treat it promptly to prevent the infection from spreading and causing further damage. Here are the steps to treat koi ulcers:

SHOULD YOU FEED KOI DURING WINTER

Winter can be a challenging time for koi keepers, as the colder water temperatures can slow down the metabolism of the fish, making it more difficult for them to digest their food. To ensure that your koi remain healthy and active during the winter months, it is important to follow a few key guidelines when it comes to feeding.

NOGAMI HIGH QUALITY KOHAKU ALL FEMALE WITH CERTIFICATES

Kohaku

Sanke

SHOWA

Chagoi

Hi Utsuri