Butterfly Koi

Description: Contrary to popular belief, a fishbowl is not an appropriate home for goldfish or a koi. Another common myth is that fish only grow to the size of their tank — this is untrue. When kept in undersized environments, goldfish and koi often suffer from serious health problems and shortened lifespans. With proper care in a spacious, filtered tank, goldfish can thrive for many years and make wonderful pets. Learn the basics of Koi care in our Complete Goldfish & Koi Care Guide!

Species: Carassius carpio | Common Name: Butterfly Koi Fish

Normal Pet Size at Maturity: up to 36 inches

Average Lifespan: 25 to 50 years, potentially longer in ideal conditions

Basic Diet: High quality goldfish flakes, koi pellets, or vegetable-based food. Want to learn more? Check out our Aquatic Pet Feeding Guide!

Habitat Necessities: Natural gravel and decor. Lots of live plants are preferred. Work with an experienced pond builder and keeper to get your pond setup and cycled prior to bringing home your koi.

Minimum Enclosure Size: 240 gallons

Does this Pet Need a Roommate? Yes, best kept in groups of 3 or more. Koi make a stunning addition to ponds where their colors can be observed from the top down. They can be very charming around meal times and recognize the people that regularly care for them! Not sure which species get along? Our Fish Compatibility Guide can help you choose compatible pond mates.

Safety Tips for You and Your Pet: It is recommended to closely monitor any new pet for 30 days in their own enclosure to observe signs ofillness, prevent the spread of potential diseases, and to limit stress while your pet acclimates to their new home. All new pets should be seen by a veterinarian within 14 days of purchase to establish care and discuss a health and wellness plan. All animals can potentially carry viral, bacterial, fungal, and parasitic diseases contagious to humans. Thoroughly wash your hands with warm, soapy water before and after contact with any pet or its habitat. Adults should assist children with hand washing after contact with a pet or its enclosure. Use caution when handling pets, and remember they may bite or scratch, especially when stressed.

Vet Assured: Pets purchased at PetSmart are part of our exclusive Vet Assured program, designed by PetSmart veterinarians to help improve the health and well-being of our pets. Our vendors meet a high standard in caring for pets and screening them for common illnesses, including Zoonotic diseases. This program also includes specific standards for in-store pet care.

When to Contact a Veterinarian: Contact an aquatic veterinarian if you notice the following signs:

• Unusual swimming pattern
  
• Thinness or decreased appetite
  
• Abdominal swelling
  
• Inflamed or discolored skin/fins
  
• Fins clamped to sides of body
  
• Scraping body on rocks (flashing)
  
• Visible signs of illness or recent fish loss

If your fish show any of the signs above, we recommend using the
"Find a Fish Vet" tool at fishvets.org or wavma.org to locate a qualified aquatic veterinarian in your area.

The PetSmart Promise: If your pet becomes ill during the initial 14-day period, or if you're not satisfied for any reason, PetSmart will gladly replace the pet or refund the purchase price.