• 25-Lot Assorted 3"-4" live koi Standard and Butterfly fin fish mixed lot PKF

    THESE KOI HAVE BEEN TANK RAISED AND ARE FEEDING ON AQUAMAX PELLETS. 25-LOT LIVE KOI FISH FOR YOUR KOI POND. Quarantine new fish arrivals for a minimum of 2 weeks before introducing them with other older fish at a minimum temperature of 75 degree F.
    $123.25
    Species: Koi
    Was: Previous Price$145.00
    Temperament: Moderate
    FAST 'N FREE
    377 sold
  • New Listing Live koi fish 9-10" Red Hana Shusui Koibay

    $125.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • 12-Lot Assorted 3"-4" Standard Fin Live Koi Fish With Overnight Shipping PKF

    12-LOT LIVE KOI FISH FOR YOUR KOI POND. Quarantine new fish arrivals for a minimum of 2 weeks before introducing them with other older fish at a minimum temperature of 75 degree F. DO NOT COUNT FISH WHILE THEY ARE IN THE POND.
    $76.50
    Species: Koi
    Was: Previous Price$90.00
    Temperament: Moderate
    FAST 'N FREE
    97 sold
  • New Listing Live koi fish 8-9" Kujaku Koibay

    Live koi fish 8-9" Kujaku. Mature and healthy fish, held and observed in our tanks over a month.
    $99.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • Live koi fish 9-10" Shusui Butterfly Koibay

    Live koi fish 9-10" Shusui Butterfly. Mature and healthy fish, held and observed in our tanks over a month.
    $125.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • New Listing Live koi fish 9-10" Gin Rin Kujaku butterfly Koibay

    Mature and healthy fish, held and observed in our tanks over a month.
    $105.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • 5 Butterfly Koi 3"

    $28.00
    Species: Koi
    $12.00 shipping
    21 watching
  • 25+ Live Gambusia Mosquito Fish Aquarium Pond Feeder Fish Hardy Guppy Pet Food

    25 Premium Live Gambusia Mosquito Fish (Koi Pond) Aquarium Feeder Fish Hardy Guppy. -Specs: These are a mix of both male and females mosquito fish. They breed almost 24/7 and reproduce rapidly! Can withstand temperatures as high as 80 degrees and as low as 30 degrees.
    $27.99
    Species: Guppy
    Free shipping
    Temperament: Peaceful
    42 sold
    Gender: Female
  • New Listing Live koi fish 8-9" Gin Rin Kohaku Koibay

    Live koi fish 8-9" Gin Rin Kohaku. Mature and healthy fish, held and observed in our tanks over a month.
    $95.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • Live koi fish 12" Red Asagi Butterfly Koibay

    Mature and healthy fish, held and observed in our tanks over a month.
    $140.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • New Listing Live koi fish 8-9" Doitsu Sanke Showa Koibay

    Live koi fish 8-9" Sanke Showa. Mature and healthy fish, held and observed in our tanks over a month.
    $125.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • New Listing Live koi fish 10" Kikokuryu Ghost Koibay

    Live koi fish 10" Kikokuryu Ghost. Mature and healthy fish, held and observed in our tanks over a month.
    $129.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • New Listing Live koi fish 11-12" Showa female Koibay

    Live koi fish 11-12" Showa female. Mature and healthy fish, held and observed in our tanks over a month.
    $145.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
    Gender: Female
  • 14-Lot Assorted 3"-4" live koi reg & Butterfly fin fish mixed lot PKF

    THESE KOI HAVE BEEN TANK RAISED AND ARE FEEDING ON AQUAMAX PELLETS. 14-LOT LIVE KOI FISH FOR YOUR KOI POND. You will receive your fish alive and healthy. Quarantine new fish arrivals for a minimum of 2 weeks before introducing them with other older fish at a minimum temperature of 75 degree F.
    $89.99
    Species: Koi
    FAST 'N FREE
    Temperament: Moderate
    230 sold
  • LIVE BUTTERFLY KOI 5 to 6" PREMIUM GRADE ASSORTED fish fin nextdaykoi NDK

    Choose Your Group Size!
    $50.40 to $393.75
    Species: Koi
    $45.00 shipping
    Temperament: Moderate
  • 5.5" KI MATSUBA Butterfly Fin Koi live fish nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $26.00
    8 bids
    $45.00 shipping
    Ending Today at 6:05PM PDT9h 50mSpecies: KoiTemperament: Moderate
  • New Listing6" SHUSUI Imported Koi live fish standard fin nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $1.25
    2 bids
    $45.00 shipping
    Ending Apr 23 at 6:17PM PDT4d 10hSpecies: KoiTemperament: Moderate
  • Live koi fish 9-10" Gin Rin Showa Butterfly Koibay

    Mature and healthy fish, held and observed in our tanks over a month.
    $125.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • New Listing6" BUTTERFLY KUMONRYU Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $22.99
    0 bids
    $50.00 shipping
    Ending Apr 21 at 6:09PM PDT2d 9hSpecies: Koi
  • New Listing6" BUTTERFLY SHIRO UTSURI Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $22.99
    1 bid
    $50.00 shipping
    Ending Apr 21 at 6:10PM PDT2d 9hSpecies: Koi
  • New Listing6" KUJAKU Imported Koi live fish standard fin nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $0.01
    0 bids
    $45.00 shipping
    Ending Apr 23 at 6:15PM PDT4d 10hSpecies: KoiTemperament: Moderate
  • 5" GOSHIKI Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $30.00
    4 bids
    $50.00 shipping
    Ending Today at 6:13PM PDT9h 59mSpecies: Koi
  • 6 Ogon Koi 3"

    $28.00
    Species: Koi
    $12.00 shipping
  • LOT of 15 Small Ogon Mom Chagoi dad Koi 1.50" - 2.0" std fin live fish FREE SHIP

    Mom is a bright orange Ogon imported from Japan. Dad is a prize winning Ginrin Chagoi from Japan. All are standard fin. Small Koi as seen in photo. About 1.5" - 2.0". Just starting to color out.
    $60.00
    Species: Koi
    Free shipping
    Temperament: Peaceful
    12 watching
  • New Listing6" GIN RIN CHAGOI Imported Koi live fish standard fin nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $0.01
    0 bids
    $45.00 shipping
    Ending Apr 23 at 6:19PM PDT4d 10hSpecies: KoiTemperament: Moderate
  • New Listing5.5" AKA BEKKO Butterfly Fin Koi live fish nextdaykoi NDK

    Shiro Bekko. This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $1.25
    2 bids
    $45.00 shipping
    Ending Apr 23 at 6:09PM PDT4d 9hSpecies: KoiTemperament: Moderate
  • Live koi fish 9" Black-Red Tancho Showa Koibay

    Live koi fish 9" Tancho Showa. Mature and healthy fish, held and observed in our tanks over a month.
    $115.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • 5" TAISHO SANKE Butterfly Fin Koi live fish nextdaykoi NDK

    Taisho Sanke. This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $34.00
    19 bids
    $45.00 shipping
    Ending Saturday at 6:09PM PDT1d 9hSpecies: KoiTemperament: Moderate
  • New Listing6" GIN RIN PLATINUM OGON Butterfly Fin Koi live fish nextdaykoi NDK

    Platinum Ogon. Yamabuki Ogon. This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $1.25
    2 bids
    $45.00 shipping
    Ending Apr 23 at 6:07PM PDT4d 9hSpecies: KoiTemperament: Moderate
  • 5" GIN RIN GIN MATSUBA Butterfly Fin Koi live fish nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $18.50
    4 bids
    $45.00 shipping
    Ending Today at 6:07PM PDT9h 53mSpecies: KoiTemperament: Moderate
  • 12-Lot Assorted 3"-4" live koi Standard & Butterfly fin Live fish mixed lot pkf

    THESE KOI HAVE BEEN TANK RAISED AND ARE FEEDING ON AQUAMAX PELLETS. 12-LOT LIVE KOI FISH FOR YOUR KOI POND. You will receive your fish alive and healthy. Quarantine new fish arrivals for a minimum of 2 weeks before introducing them with other older fish at a minimum temperature of 75 degree F.
    $84.15
    Species: Koi
    Was: Previous Price$99.00
    Temperament: Moderate
    FAST 'N FREE
    468 sold
  • New Listing5" DOITSU OCHIBA SHIGURE Butterfly Fin Koi live fish nextdaykoi NDK

    Ochiba Shigure. This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $0.01
    0 bids
    $45.00 shipping
    Ending Apr 23 at 6:05PM PDT4d 9hSpecies: KoiTemperament: Moderate
  • New Listing6" SHOWA SANSHOKU Imported Koi live fish standard fin nextdaykoi NDK

    Showa Sanshoku. This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $0.01
    1 bid
    $45.00 shipping
    Ending Apr 23 at 6:21PM PDT4d 10hSpecies: KoiTemperament: Moderate
  • New Listing8" SUMI GOROMO Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $32.99
    1 bid
    $50.00 shipping
    Ending Apr 21 at 6:14PM PDT2d 9hSpecies: Koi
  • New Listing6" GIN RIN GOSHIKI Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $19.50
    3 bids
    $50.00 shipping
    Ending Apr 21 at 6:13PM PDT2d 9hSpecies: Koi
  • 5" KIKUSUI Koi live fish standard fin nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $9.50
    6 bids
    $45.00 shipping
    Ending Today at 6:01PM PDT9h 46mSpecies: KoiTemperament: Moderate
  • 6" HEISEI NISHIKI Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $19.50
    2 bids
    $50.00 shipping
    Ending Saturday at 6:17PM PDT1d 10hSpecies: Koi
  • 7" KUJAKU Standard Fin Live Koi Fish

    F ish are health checked daily.
    $32.95
    0 bids
    $45.00 shipping
    Ending Apr 21 at 5:51PM PDT2d 9hSpecies: KoiTemperament: Moderate
  • New Listing Live koi fish 8-9" Kohaku Red white Koibay

    Live koi fish 8-9" Kohaku. Mature and healthy fish, held and observed in our tanks over a month.
    $90.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • New Listing7" HI UTSURI Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $28.99
    1 bid
    $50.00 shipping
    Ending Apr 21 at 6:19PM PDT2d 10hSpecies: Koi
  • 4" GIN RIN CHAGOI Live Koi Fish Pond Garden BKD

    $13.50
    3 bids
    $50.00 shipping
    Ending Saturday at 6:18PM PDT1d 10hSpecies: Koi
  • New Listing8.5" YAMATONISHIKI Koi live fish standard fin nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $7.50
    5 bids
    $45.00 shipping
    Ending Apr 23 at 6:23PM PDT4d 10hSpecies: KoiTemperament: Moderate
  • 5.5" KI UTSURI Butterfly Fin Koi live fish nextdaykoi NDK

    Shiro Utsuri. This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $10.50
    10 bids
    $45.00 shipping
    Ending Saturday at 6:05PM PDT1d 9hSpecies: KoiTemperament: Moderate
  • 6" BUTTERFLY "CLOWN NOSE" KOHAKU Live Koi Fish Pond Garden BKD

    Our fish are healthy, parasite free, and microscopy scraped to be sure they are clean before they are released for sale. We are here to provide you with the best quality koi that have been selected from literally thousands!
    $22.99
    1 bid
    $50.00 shipping
    Ending Today at 6:12PM PDT9h 57mSpecies: Koi
  • 5" GOLD CROWN Butterfly Fin Koi live fish nextdaykoi NDK

    This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $9.11
    5 bids
    $45.00 shipping
    Ending Saturday at 6:07PM PDT1d 9hSpecies: KoiTemperament: Moderate
  • Live koi fish 10-11" Golden Wing Chagoi Butterfly Koibay

    Mature and healthy fish, held and observed in our tanks over a month.
    $135.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
  • New Listing7" BUTTERFLY KI MATSUBA Live Koi Fish Pond Garden BKD

    $34.99
    0 bids
    $50.00 shipping
    Ending Apr 21 at 6:16PM PDT2d 10hSpecies: Koi
  • New Listing4.5" BENI KUMONRYU Koi live fish standard fin nextdaykoi NDK

    Beni Kumonryu. This strict bio-security plan eliminates the possibility of infection or contamination. For us, this is not just a job, it's a way of life. Judging the size of koi by eyesight only can be misleading, especially for butterfly koi.
    $0.01
    0 bids
    $45.00 shipping
    Ending Apr 23 at 6:04PM PDT4d 9hSpecies: KoiTemperament: Moderate

Got one to sell?

Get it in front of 160+ million buyers.

Keeping Live Aquarium Koi Fish as a Hobby is Fun and Rewarding

Koi fish can make excellent aquarium inhabitants because they are beautiful, sociable, and fun to watch. They live for a long time, so need committed owners. If you decide to begin keeping these delightful companions, affordable koi fish are available on eBay.

What are koi fish?

Koi are freshwater fish and are varieties of carp. They are colored variants, with one very popular breed of koi being the Gosanke type. The Gosanke group includes the Taisho Sanshoku, the Kohaku, and the Showa Sanshoku varieties. They are distinguished by the patterns, colors, and scales, with typical coloration of white, black, orange, yellow, red, blue, and cream. They are primarily kept outside in ponds and water gardens, but in cold weather they may need to be brought indoors and placed in an aquarium.

What equipment and supplies do you need for aquariums?

To keep your colorful koi fish healthy and happy, you need these supplies and equipment:

  • Heater - These fish can tolerate temperatures below 40 degrees Fahrenheit and above 80 degrees Fahrenheit, but ideally should have a heater regulating the temperature from 68 to 77 degrees Fahrenheit.
  • Filter - Install an external filter to the aquarium that is rated for the number of gallons in your tank. A carbon filter will help remove toxins and impurities, thus improving water quality.
  • Substrate material - Place a substrate layer for the tank that is two inches deep. Use a mixture of small gravel, larger gravel, and rock pieces. They enjoy sifting through the gravel.
  • Tank - The tank should have one cubic foot per one inch of koi fish length. Multiply the tank's height, width, and length to determine the tank's cubic footage.
  • Lighted cover - Use a cover with a light because koi require 12 hours of light per day.
  • pH stabilizer - The fish require a neutral pH between 7-9. You can add a pH stabilizer to the water if the pH gets too low.
  • Dechlorinator - Use a dechlorinator before adding water to the tank if the water has chlorine.
  • Food - Feed them an amount of food they can eat in five minutes.
Where can you keep koi?

You can keep koi in a pond outside or in an indoor tank. The water needs to have a pH level between 7-8.5. The water should contain no chlorine, lead, iron, zinc, or copper. A proper pond filter is also required. Make sure the water levels are adequate, with 10 gallons of water for every inch of fish, a minimum volume of 1000 gallons, and a minimum pond depth of three feet. Koi can also be kept in an aquarium, with all the appropriate equipment to keep the water at the correct quality and temperature.

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