Koi Guides

Practical koi and pond guides written from the counter at our San Jose facility, where we have been importing and keeping Japanese Nishikigoi since 1998. Real numbers, honest trade-offs, and advice we would give you in person.

New to koi? Start here

Request a Koi: How to Have Yours Found in Japan

Tom Lai

The request form is open. What to put in it, why requests start at $1,500, and what happens when Tom finds your fish at a farm in Niigata.

Request a Koi: How to Have Yours Found in Japan

Tom Lai

The request form is open. What to put in it, why requests start at $1,500, and what happens when Tom finds your fish at a farm in Niigata.

Mr. Ogata and his crew herding koi along a seine net at Ogata Koi Farm's mud pond harvest in Kurume

Koi Harvest Season: Inside a Buying Trip to Nii...

Tom Lai

Five farms in a day, sometimes ten. What it takes to buy koi at the Japanese harvest, why our fish go up for sale while we are still in Niigata,...

Koi Harvest Season: Inside a Buying Trip to Nii...

Tom Lai

Five farms in a day, sometimes ten. What it takes to buy koi at the Japanese harvest, why our fish go up for sale while we are still in Niigata,...

Koi Quarantine: How to Quarantine New Koi Fish

Tom Lai

A four-week koi quarantine protocol with the numbers that matter: 74-78°F, 150 gallons, salt at 0.3%, one praziquantel course and the release criteria we use before a fish joins the...

Koi Quarantine: How to Quarantine New Koi Fish

Tom Lai

A four-week koi quarantine protocol with the numbers that matter: 74-78°F, 150 gallons, salt at 0.3%, one praziquantel course and the release criteria we use before a fish joins the...

Koi Pond Water Treatments and Medications: A Pr...

Tom Lai

Water chemistry first, medications second: the numbers to hold, what conditioners and salt actually do, and a symptom table for working out what is wrong before you dose.

Koi Pond Water Treatments and Medications: A Pr...

Tom Lai

Water chemistry first, medications second: the numbers to hold, what conditioners and salt actually do, and a symptom table for working out what is wrong before you dose.

Pond Skimmers, Covers and Netting: The Two Buys...

Tom Lai

Sizing a pond skimmer by surface area, where to place it, what leaf litter really costs you in filter load and spring ammonia, and predator protection that works on an...

Pond Skimmers, Covers and Netting: The Two Buys...

Tom Lai

Sizing a pond skimmer by surface area, where to place it, what leaf litter really costs you in filter load and spring ammonia, and predator protection that works on an...

Koi Pond Winter Care: De-Icers, Heaters and Win...

Tom Lai

A month-by-month winter plan, from the last autumn water change to the spring restart, with de-icer sizing, running costs and the heating decision made honestly.

Koi Pond Winter Care: De-Icers, Heaters and Win...

Tom Lai

A month-by-month winter plan, from the last autumn water change to the spring restart, with de-icer sizing, running costs and the heating decision made honestly.