The Koi Exchange
- Koi lovers community covering keeping, breeding, ponds and equipment. Includes forum, photo exchange, koi rating, koi doctor, beginners section, projects and UK and worldwide koi news.
- http://www.thekoiexchange.co.uk

Koi Q & A
- A blog offering answers to ponding and Koi keeping questions. Includes video, classification, care, health, and filtration information.
- http://www.nishikigoi-info.com/koi/koi.html

Koi Krazy Farm Resource Network
- Offers important information on Koi farming, ornamental fish, pond design, fish diseases, Koi show locations, and pump reviews.
- http://koi-krazy.net

Aqua Industries
- Koi and dry goods wholesaler located in the British midlands. Direct import market coordinator for Sing Chang Koi.
- http://www.aqua-industries.com

All About Koi
- Information about these fish, ponds and diseases in blog format.
- http://koleksi-koi-lokal.blogspot.com

S and P Fish Hatchery
- Koi breeders based in Olanta, Pennsylvania.
- http://www.spfishhatchery.com

Koi-Bito Discussion Board
- Offers an outlet for keepers of Nishikigoi Koi, at Koi Bito magazine, to discuss fish keeping issues.
- http://www.koi-bito.com/forum

Australian Koi Forum
- For discussion of Koi topics.
- http://www.koi2day.com/forum/

Koi Carp
- A blog about keeping koi carp (Nishikigoi).
- http://www.koi-carp.blogspot.com/

Koi Fish and Koi Ponds Guide
- Tips on keeping Koi and Koi ponds.
- http://lifestylemax.com/koi-pond/

Nishikigoi Information
- This is an educational site dedicated to expanding the knowledge of the colored carp, Koi.
- http://www.nishikigoi-info.com/index.html

Koi Talk
- Discussion forum, with sections on pond building, and Koi health. Registration required, free.
- http://phpbb-host.com/phpbb/index.php?mforum=koitalk&sid=e89005744c0267b119d2d47dc1a95291

Prestige Koi Imports
- Sales, information and help with regard to health and general Koi keeping. UK wide delivery.
- http://www.koi-fish.co.uk/

Koi Oriental
- Advice, private sales, discounts, articles and a forum. Requires fee-based registration.
- http://www.koioriental.com/

MnH Koi
- Small Japanese and English bred Koi for sale.
- http://www.mnhkoi.co.uk

Koi And Ponds
- A comprehensive online reference on Koi keeping that includes varieties list, pond care, and diseases.
- http://www.koiandponds.com

KoiLibrary
- Articles include product reviews, as well as setting up a pond, plant disinfection, and nutrition.
- http://www.koilibrary.com/

Joseph Japanese Koi Site
- Photos of ponds, water garden flowers, and fish.
- http://home.tiscali.be/joseph.nishikigoi/pond.htm

Richard's Koi Page
- Features pictures and information, pond construction, and completed results.
- http://home.versatel.nl/rich-san.bos/koiindex.htm

Tom Burton's Koi Site
- Articles on raising and keeping Koi.
- http://tomskoi.com/

Koiphen
- Offers a discussion forum, web cams, and auction.
- http://www.koiphen.com/

University of Florida: Koi Herpes Virus (KHV) Disease
- Description, symptoms, and prevention.
- http://edis.ifas.ufl.edu/VM113

Antonio Koi
- Pond and Koi photos, descriptions of Koi types, converters and calculators.
- http://homepage.ntlworld.com/a.antonio/

The Koi Khronicle
- Experiences with the creation and maintenance of a mini-pond.
- http://koikhronicle.blogspot.com/

Koi Keepers
- Brief descriptions of Koi varieties, care tips, and treat suggestions.
- http://www.koikeepers.com

Koi Magazine
- Includes a forum. Requires free registration.
- http://www.koimag.co.uk

Cads Koi Carp
- Seasonal care information, health topics, a pond gallery, message board and links.
- http://www.cadskoi.co.uk

Koi Cymru Forum
- Deals with subjects relating to keeping Koi carp, including building and maintaining ponds.
- http://www.network54.com/Hide/Forum/goto?forumid=13591&achk=1

KoiChat
- Discussion forum dealing with all aspects of Koi keeping. Includes a section to sell surplus fish and equipment.
- http://www.koichat.com

Koi Carp and Fish Ponds Information
- A beginner's guide to keeping fish in a backyard recirculated freshwater pond.
- http://www.vcnet.com/koi_net/

Planet Koi
- Information on all aspects of keeping Koi.
- http://www.koicarp.demon.co.uk/

A Koi Vet
- Articles on a variety of topics, including medications, diseases and surgery.
- http://www.koivet.com