• Live Aquarium Fish Butterfly Koi

    $20.00
    Species: Koi
    $16.00 shipping
    Temperament: Peaceful
    36 watching
  • 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
    575 sold
  • LIVE KOI 5 to 6" PREMIUM GRADE ASSORTED fish fin nextdaykoi NDK

    Choose Your Group Size!
    $47.25 to $367.50
    Species: Koi
    $45.00 shipping
    Temperament: Moderate
  • New Listing5" 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!
    $15.49
    2 bids
    $50.00 shipping
    Ending Thursday at 6:06PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • 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
    183 sold
  • 25-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. 25-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.
    $123.25
    Species: Koi
    Was: Previous Price$145.00
    Temperament: Moderate
    FAST 'N FREE
    104 sold
  • Live aquarium fish Japanese Koi

    Japanese koi color varies and size as well all koi being sold are a 1" to 3" in length beautiful color and shape.
    $9.99
    Species: Koi
    $16.00 shipping
    Temperament: Peaceful
  • LIVE KOI 6 to 8" PREMIUM GRADE ASSORTED fish fin nextdaykoi NDK

    Choose Your Group Size!
    $69.30 to $420.00
    Species: Koi
    $45.00 shipping
    Temperament: Moderate
  • 10-Lot Assorted 2"-4" Standard Fin Live Koi Fish A-Quality for Pond Garden PKF

    10-LOT LIVE KOI FISH FOR YOUR KOI POND. You will receive your fish alive and healthy. THEM TO THE POND. DO NOT COUNT FISH WHILE THEY ARE IN THE 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.
    $70.00
    Estimated delivery dateEst. delivery Thu, Sep 19
    FAST 'N FREE
    Species: Koi
    173 sold
    Temperament: Moderate
  • New Listing6.5" Button-nose Ochiba Shigure Japanese Imported Live Koi Fish

    All of our koi are hand-picked in Japan and brought back to the US. The Koi pictured is the one you will receive.
    $34.99
    Species: Koi
    $55.00 shipping
    Temperament: Peaceful
    or Best Offer
  • New Listing5" Ochiba Shigure From Yamasaki Koi Farm - Japanese Imported Live Koi Fish

    Breeder: Yamasaki. All of our koi are hand-picked in Japan and brought back to the US. The Koi pictured is the one you will receive.
    $35.00
    Species: Koi
    $55.00 shipping
    Temperament: Peaceful
    or Best Offer
  • New Listing5.5" Sparkly Ochiba From Yamasaki Koi Farm - Japanese Imported Live Koi Fish

    Breeder: Yamasaki. All of our koi are hand-picked in Japan and brought back to the US. The Koi pictured is the one you will receive.
    $37.00
    Species: Koi
    $55.00 shipping
    Temperament: Peaceful
    or Best Offer
  • 6" BUTTERFLY OCHIBA 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 Today at 6:03PM PDT7h 41mSpecies: KoiTemperament: Peaceful
  • New Listing6" Ochiba Shigure From Yamasaki Koi Farm - Japanese Imported Live Koi Fish

    Breeder: Yamasaki. All of our koi are hand-picked in Japan and brought back to the US. The Koi pictured is the one you will receive.
    $36.00
    Species: Koi
    $55.00 shipping
    Temperament: Peaceful
    or Best Offer
  • 4" HEISI 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!
    $10.99
    1 bid
    $50.00 shipping
    Ending Today at 6:17PM PDT7h 55mSpecies: KoiTemperament: Peaceful
  • 5" GIN RIN TAISHO SANKE Koi live fish standard fin nextdaykoi NDK

    No fish from any other source are ever allowed into our facilities. This strict bio-security plan eliminates the possibility of infection or contamination. Taisho Sanke. For us, this is not just a job, it's a way of life.
    $4.00
    8 bids
    $45.00 shipping
    Ending Today at 6:02PM PDT7h 40mSpecies: KoiTemperament: Moderate
  • 7" BUTTERFLY GOLD WING KARASU 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!
    $34.99
    0 bids
    $50.00 shipping
    Ending Today at 6:04PM PDT7h 42mSpecies: KoiTemperament: Peaceful
  • 5" 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!
    $40.00
    11 bids
    $50.00 shipping
    Ending Today at 6:19PM PDT7h 57mSpecies: KoiTemperament: Peaceful
  • New Listing5" TANCHO 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!
    $16.50
    2 bids
    $50.00 shipping
    Ending Thursday at 6:19PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • New Listing6" SANKE 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!
    $19.49
    2 bids
    $50.00 shipping
    Ending Thursday at 6:15PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • New Listing6" DOITSU GIN RIN BENI 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!
    $18.99
    0 bids
    $50.00 shipping
    Ending Thursday at 6:02PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • New Listing4" 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!
    $10.99
    0 bids
    $50.00 shipping
    Ending Thursday at 6:20PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • 6" SHUSUI 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!
    $27.00
    6 bids
    $50.00 shipping
    Ending Wednesday at 6:01PM PDT1d 7hSpecies: KoiTemperament: Peaceful
  • 5 + 5 FREE Trapdoor Snails FREE SHIPPING for Ponds, Koi, Gardens, Algae Eaters

    This lot is for 5 Trapdoor Snails. I will include 5 extra in case of DOA (Dead On Arrival). sizes will range from small to large as seen in picture. These snails are a great addition for any ponds or fish tanks.
    $20.00
    Species: Koi
    or Best Offer
    Temperament: Peaceful
    FAST 'N FREE
    18 sold
  • 5" SHOWA 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!
    $14.99
    1 bid
    $50.00 shipping
    Ending Wednesday at 6:07PM PDT1d 7hSpecies: KoiTemperament: Peaceful
  • 8" BUTTERFLY DOITSU KUJAKU 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!
    $44.00
    2 bids
    $50.00 shipping
    Ending Today at 6:16PM PDT7h 54mSpecies: KoiTemperament: Peaceful
  • 7" BUTTERFLY ASAGI 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!
    $34.99
    1 bid
    $50.00 shipping
    Ending Today at 6:02PM PDT7h 40mSpecies: KoiTemperament: Peaceful
  • 5" BLUE SHUSUI Koi live fish standard fin nextdaykoi NDK

    No fish from any other source are ever allowed into our facilities. 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.
    $5.00
    4 bids
    $45.00 shipping
    Ending Today at 6:03PM PDT7h 41mSpecies: KoiTemperament: Moderate
  • 4-Lot Assorted 8”-10”Standard Fin Live Koi Fish For Koi Pond Garden PKF

    4 LOT LIVE KOI FISH FOR YOUR KOI POND. THESE KOI HAVE BEEN TANK RAISED AND ARE FEEDING ON AQUAMAX PELLETS. DO NOT COUNT FISH WHILE THEY ARE IN THE 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.
    $74.99
    Species: Koi
    $45.00 shipping
    Temperament: Peaceful
  • New Listing7" BUTTERFLY KIKOKURYU GHOST 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!
    $34.99
    0 bids
    $50.00 shipping
    Ending Thursday at 6:16PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • 5" KOHAKU Butterfly Koi live fish nextdaykoi NDK

    No fish from any other source are ever allowed into our facilities. This strict bio-security plan eliminates the possibility of infection or contamination. Tancho Kohaku. For us, this is not just a job, it's a way of life.
    $0.11
    2 bids
    $45.00 shipping
    Ending Today at 6:05PM PDT7h 43mSpecies: KoiTemperament: Moderate
  • 5" DOITSU KUJAKU Butterfly Koi live fish nextdaykoi NDK

    No fish from any other source are ever allowed into our facilities. 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.
    $1.25
    10 bids
    $45.00 shipping
    Ending Today at 6:06PM PDT7h 44mSpecies: KoiTemperament: Moderate
  • 5" KUJAKU 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!
    $14.99
    1 bid
    $50.00 shipping
    Ending Today at 6:09PM PDT7h 47mSpecies: KoiTemperament: Peaceful
  • New Listing5" HI SHUSUI 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!
    $14.99
    0 bids
    $50.00 shipping
    Ending Thursday at 6:04PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • New Listing5" GIN RIN SHOWA 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!
    $14.99
    1 bid
    $50.00 shipping
    Ending Thursday at 6:09PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • 7" BUTTERFLY KIKOKURYU GHOST 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!
    $34.99
    2 bids
    $50.00 shipping
    Ending Today at 6:10PM PDT7h 48mSpecies: KoiTemperament: Peaceful
  • New Listing6" SMOKEY JOE HEISI 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!
    $18.99
    1 bid
    $50.00 shipping
    Ending Thursday at 6:05PM PDT2d 7hSpecies: KoiTemperament: Peaceful
  • 6" 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!
    $18.99
    0 bids
    $50.00 shipping
    Ending Today at 6:07PM PDT7h 45mSpecies: KoiTemperament: Peaceful
  • 5" KI UTSURI Butterfly Koi live fish nextdaykoi NDK

    Shiro Utsuri. No fish from any other source are ever allowed into our facilities. 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.
    $15.50
    21 bids
    $45.00 shipping
    Ending Today at 6:07PM PDT7h 45mSpecies: KoiTemperament: Moderate
  • 15 + 5 CLEAN Trapdoor Snails FREE SHIPPING

    This lot is for 15 Trapdoor Snails. I will include 5 extra in case of DOA (Dead On Arrival). sizes will range from small to large as seen in picture. These snails are a great addition for any ponds or fish tanks.
    $29.99
    Species: Koi
    FAST 'N FREE
    9 watching
  • 5" DOITSU SANKE 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!
    $14.99
    1 bid
    $50.00 shipping
    Ending Wednesday at 6:20PM PDT1d 7hSpecies: KoiTemperament: Peaceful
  • 6" DOITSU SANKE 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!
    $18.99
    1 bid
    $50.00 shipping
    Ending Today at 6:12PM PDT7h 50mSpecies: KoiTemperament: Peaceful
  • New Listing5" KIKOKURYU Butterfly Koi live fish nextdaykoi NDK

    Kin Kikokuryu. No fish from any other source are ever allowed into our facilities. 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.
    $6.05
    5 bids
    $45.00 shipping
    Ending Saturday at 6:05PM PDT4d 7hSpecies: KoiTemperament: Moderate
  • New Listing4" GIN RIN CHAGOI Koi live fish standard fin nextdaykoi NDK

    No fish from any other source are ever allowed into our facilities. 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.
    $0.01
    1 bid
    $45.00 shipping
    Ending Saturday at 6:02PM PDT4d 7hSpecies: KoiTemperament: Moderate
  • 7.5" High Quality Japanese Imported Koi - Gin Rin Ochiba Shigure

    All of our koi are hand-picked in Japan and brought back to the US. The Koi pictured is the one you will receive.
    $54.99
    Species: Koi
    $55.00 shipping
    Temperament: Peaceful
  • LIVE KOI 3 to 4" PREMIUM GRADE ASSORTED fish fin nextdaykoi NDK

    Choose Your Group Size!
    $84.00 to $525.00
    Species: Koi
    $45.00 shipping
    Temperament: Moderate
  • 5" SMOKEY JOE HEISI 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!
    $14.99
    1 bid
    $50.00 shipping
    Ending Today at 6:14PM PDT7h 52mSpecies: KoiTemperament: Peaceful
  • 4" BENI 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!
    $10.99
    2 bids
    $50.00 shipping
    Ending Wednesday at 6:19PM PDT1d 7hSpecies: KoiTemperament: Peaceful

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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