Author Archives: Koi-Care staff

Koi Pond Construction: The Basics of Building your Pond

Section 1 – Choosing the location One of the biggest challenges in constructing a Koi pond is finding the right location for it. Having a koi pond that is either inaccessible or hidden defeats to the reason why you installed … Continue reading






Posted in Pond Equipment | Tagged bottom drains, concrete liner, fiberglass shell, koi ponds, pond construction, pondliner | 4 Comments

Understanding Koi Pond Filtration

  Koi Pond Filtration: The Basics Koi ponds and koi keeping are gaining popularity in the U.S. and in many parts of the world. Koi ponds are as varied as the places they are found. Ponds can be deep or … Continue reading






Posted in Pond Equipment | Tagged aquatic plants, biological filtration, bottom drains, Ionization, koi pond filtration, mechanical filtration, nitrifying bacteria, ozone, settlement tank, skimmer, UV | 6 Comments

“Chilled Out” Koi: How Koi Survive Frozen Ponds in Winter

  If you live in a northern climate then chances are good that you see snow and ice as does your koi pond.  Its natural to worry about your koi during the winter periods, especially if they have been around for … Continue reading






Posted in General Koi Information | Tagged aeration, de-icers, dormancy, frozen koi ponds, gas exchange, less activity, no food, survival | 9 Comments

Feeding your Koi as Water Temperatures Change

Everyone knows that water temperature plays a big role in how active koi are but a koi’s metabolism and ability to digest certain types of foods are also affected. Its critical that as temperatures drop with approaching winter or as … Continue reading






Posted in Food and Nutrition | Tagged feeding, food, healthy koi treats, koi foods to avoid, recommended foods, water temperature | 14 Comments

Quarantine Your Koi: Why and How

Anyone that has cared for or owned koi for any significant period of time has had to isolate their fish for one reason or another. Sometimes its necessary to remove your fish in order to clean their pond or perhaps … Continue reading






Posted in Koi Diseases | Tagged diseased fish, hospital tank, koi, proper size, quarantine, transferring fish | Leave a comment

Why Algae Occurs and How to Get Rid Of It

It is the case that every spring, as temperatures rise and daylight hours increase, an algal bloom occurs in almost everyone’s koi pond.  Dreaded algal blooms, like green water that make koi disappear from view or unsightly string algae that … Continue reading






Posted in Algae Problems | Tagged algecide, barley straw, beneficial bacteria, blanketweed, copper, free floating, green water, horsehair algae, koi clay, koi pond algae, pea soup, potassium permanganate, salt, simazine, string algae, UV sterilizer, water net | 63 Comments

Understanding the Biological Cycle of Your Koi Pond

The biological cycle is really better defined as the “nitrogen cycle” because primarily what pond keepers are concerned with is nitrogenous waste.  When it comes to elements, nitrogen is pretty common. In fact, it makes up almost 80% of our … Continue reading






Posted in Pond Care | Tagged ammonia, biolgical cycle, fish waste, free nitrogen, nitrate, nitrite, nitrogen cycle | 4 Comments

I’ve got koi fry –now what!? A step wise approach to raising baby koi

If you just noticed that your pond now has a million little koi fry swimming around then skip down to the feeding section but if you haven’t bred koi yet and need an introduction then read on. Spawning typically occurs … Continue reading






Posted in Breeding Koi | Tagged baby koi, breeding koi, koi fry | 40 Comments

What are the ideal water conditions for healthy koi?

There will certainly be a lot of differing opinions on the best water conditions for koi but one thing remains constant: poor water quality leads to a host of other health problems that are certainly avoidable with proper care.  Because … Continue reading






Posted in Pond Care | Tagged ammonia, dissolved oxygen, health, KH, koi, nitrates, nitrites, pH, salt, water chemistry, water temperature | 40 Comments

The Major Koi Varieties and Their Traits

Presented here are what many consider the 13 major varieties of koi or “Nishikigoi”.  There are certainly some koi practitioners that may consider there to be up to 16 varieties (and even up to 22 if one counts newer strains … Continue reading






Posted in General Koi Information | Tagged kohaku, koi, ogon, showa, tancho, variety | 11 Comments