Category Archives: Koi Fish Facts

Koi Fish Facts, including everything you’d want to know about keeping koi fish. How to care for your koi fish, and how to maintain a happy, healthy koi pond (or tank).

Karasu: The Koi Pond Phantom
April 9, 2019

Karasu. The Crow. Pronounced kar-rah-soo, it gets its name because of its deep, jet black[read more...]

|big koi fish in a koi pond|Waterfall over a Koi Pond|Koi Pond in a Japanese Garden|Koi fish with color filter|Koi pond with waterfall frozen|pond out of focus with pillars and green water
14 Things They Don’t Tell You About Water in Koi School (And What You Can Do About It)

No matter how novice or veteran of a koi keeper you are, there’s much to[read more...]

28
Mar
American Mink on rock|Mink in the Snow||
Koi Fish Predators: Mink—The Pond Wolf

One of the sad facts about becoming a koi keeper is that when you build[read more...]

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20
Feb
Koi pond in winter under plastic and frame||Koi Pond winter cover|Ko pond coverage used in winter|Koi pond in the winter under a cover|
Koi Fish and Extreme Weather

Freezing winter temperatures and extreme weather conditions can severely impact the safety of your koi[read more...]

12
Feb
Great Blue Heron on the side of a pond|||
Koi Predators: Heron

Heron. Nothing stirs up dread in a koi owner quite like that word. The Great[read more...]

23
Jan
North American river otter|River Otter habitat and effecting koi ponds|Otter in the snow with fish in its mouth
Koi Predators: Otters

What an Otter Shambles. At least that is what the headlines should read about the[read more...]

29
Dec
Sanke and Ki Utsuri koi swimming in a murky pond|Koi Pond Expenses||Koi in pond in Meditation garden|Koi hidden under leaves on top of koi pond
15 Commandments of Koi Keeping

Unlike a quick list of dos and don’ts guiding the morality of the human race,[read more...]

14
Dec
koi fish swimming in a pond|KOI nitrogen cycle v2|Temperature and Dissolved Oxygen concentration chart for koi ponds|Red streaked fins on a koi|koi gasping at the surface for air|Foam on top of a koi pond
The Shape of Koi Water

As a koi keeper, you only have so much control over your koi. However, what[read more...]

17
Nov
Fall and Your Koi Fish—Prepping For The Cold

Summer is gone and spring is a ways off. However, the business of keeping koi[read more...]

25
Oct
Digging a Koi Pond: A Few Things to Consider
September 27, 2018

You’ve fallen in love with koi fish. You’ve looked at some koi ponds. You’ve made[read more...]