Koi are domesticated common carp bred over 200 years for color + pattern. Categories: Kohaku (red on white), Sanke (red + black on white), Showa (red + white on black), Tancho (single red spot on head), Ogon (single-color metallic), Doitsu (scaleless German strain), Butterfly (long-finned). Domestic-bred koi are hardy in zone 5+ ponds with adequate depth (3+ feet for ice cover). Imported Japanese koi command premium prices ($500-50,000+) for show-quality specimens.
Koi pellet (Hikari Saki, Tetra Pond), vegetables, occasional treats
Pond goldfish, sarasa comet, butterfly koi
All US states
State legality is enforced at checkout - the Fast Aquatics 52-rule legality engine blocks restricted shipments before payment. Permits + DNR rules vary by state for sport-fish stocking over personal-use thresholds.
Live Koi listings from approved Fast Aquatics pond + aquaculture vendors. Filter by ship-from state to find the closest hatchery for cold-chain efficiency.
Browse Koi listings → Pond stocking companies →
Fish farms, hatcheries, and pond-stocking companies: list Koi for direct-to-pond-owner sales + wholesale Fast Frags partnerships.
Apply as a vendorKoi - Pond Stocking, Care & Vendors taxonomy and care recommendations cross-checked against the following authoritative references and our internal vendor + breeder database.
Answers to the questions experienced keepers ask after the basic care guide.
Drip acclimation over 60 to 90 minutes is the safest approach for Koi - Pond Stocking, Care & Vendors. Match temperature first (15 minute float), then drip 2 to 3 drops per second from the display sump until the bag volume has tripled. Test salinity (or freshwater hardness) at the end - if it is within 0.001 SG (or 2 dGH) of the display, transfer the specimen with a net rather than pouring shipping water in.
Aim for biological + mechanical + chemical staging. Canister or sump-driven filtration sized for 5x to 8x display turnover per hour, mechanical floss replaced weekly, and carbon or GAC swapped every 4 to 6 weeks. Koi - Pond Stocking, Care & Vendors responds well to stable nitrate (under 20 ppm) more than to any specific filter brand - stability beats peak performance.
For saltwater specimens, yes - a properly-sized skimmer rated for 1.5x to 2x display volume keeps dissolved organics low and reduces nuisance-algae triggers. Freshwater specimens do not need skimmers; a well-stocked plant grow-out + canister with chemical media achieves the same end. Koi - Pond Stocking, Care & Vendors kept without adequate organic export tends to show stress within 90 days.
Compatibility with planted tanks depends on the species behavior + water chemistry overlap. Plant-safe specimens leave foliage alone; some pick at soft-tissue plants like vallisneria or anubias. Check the species page profile + the planted-tank compatibility note before stocking Koi - Pond Stocking, Care & Vendors in a high-tech CO2-injected setup with valuable cultivars.
For freshwater specimens with no plant requirements, a basic LED at 30 to 50 PAR at substrate is sufficient and reduces algae. For saltwater + reef specimens, target 100 to 250 PAR depending on photo-tolerance, with a sunrise/sunset ramp + a 8 to 10 hour photoperiod. Koi - Pond Stocking, Care & Vendors tolerates a wider lighting band than most keepers expect; consistency matters more than peak intensity.
Most aquarium species evolved in moderate flow with localized turbulence rather than uniform high flow. Aim for 20x to 40x display turnover for reef specimens, 4x to 6x for community freshwater. Koi - Pond Stocking, Care & Vendors shows stress fins (clamped, frayed) when flow is mismatched - dial back if you see this within 14 days of introduction.
Sustained drift above +/- 2 F from target is the threshold most keepers miss. Koi - Pond Stocking, Care & Vendors tolerates day-night swings of 1 to 2 F without issue but a 4 F shift over 2 hours triggers ich + bacterial bloom risk. Use a controller-driven heater (not the built-in dial) and a backup thermometer at the opposite end of the tank.
For freshwater fish: ich, columnaris, and fin rot are the top three; quarantine + UV sterilizer prevents the majority. For marine fish: ich (Cryptocaryon), velvet (Amyloodinium), and bacterial infections; tank-transfer method or copper QT during the 30-day acclimation cycle prevents nearly all outbreaks. For inverts + corals: tissue necrosis, parasitic isopods, and protozoan blooms.
Captive breeding success varies enormously by species - some breed readily in community tanks (livebearers, cherry shrimp, clownfish) while others have never been captive-bred (most reef fish + most marine inverts). Check the species-specific care guide for the breeding-method note + larval-rearing protocol. Koi - Pond Stocking, Care & Vendors kept in pairs or small groups often spawns even without intent if conditions are right.
Avoid same-species rivals (especially male-male pairings for territorial species), known fin-nippers (tiger barbs, certain pufferfish), and anything that out-competes for food or out-grows the tank. Koi - Pond Stocking, Care & Vendors also struggles with hyper-aggressive cichlids in freshwater and damselfish in saltwater - both will hold territory at the expense of every other tankmate.
Most ornamental specimens accept cleaner shrimp + cleaner gobies; cleaner wrasses (Labroides) often die in captivity and are not recommended. Koi - Pond Stocking, Care & Vendors kept with cleaner pairs typically benefits from parasite control + stress reduction, but verify the cleaner does not get eaten by checking the species size + temperament chart.
Captive lifespan tracks closely to wild lifespan when water chemistry, diet, and tankmate stress are managed. Most aquarium fish live 5 to 12 years; long-lived species (large cichlids, pufferfish, some tangs) reach 15+ years. Koi - Pond Stocking, Care & Vendors kept in a stable, properly-sized system should live within 80% to 100% of the species lifespan ceiling - early death usually traces back to chronic-stress causes (parameters, tankmates, diet) rather than disease.