Koi & Goldfish – The Same
Or Different?

Have you ever wondered if there is a such thing as a koi goldfish? Is it one kind of fish or two different kinds?

Well, even though they are both descended from carp, they ARE different.

Koi were bred and developed in Japan, and goldfish were bred and developed in China.  Aside from their origins they have other differences (and similarities) as well.

If you aren’t sure whether you should have koi, goldfish, or both, consider the needs of each.

A major consideration is the size of your pond. Koi need much more room than goldfish for a few reasons.

The first, and one of the primary differences, is that koi will grow to be larger than goldfish.  Along with this is the fact that even though they are generally longer-lived than goldfish are, they need better water quality to survive and thrive.

Goldfish can live in a smaller pond with very little care. Koi should have a minimum 1000 gallon pond, and you need to be careful that you don’t overpopulate it at the beginning when the koi are younger and smaller in size! Overpopulation is a primary cause of poor water quality.

Koi & goldfish can co-exist peacefully

As far as other physical differences, koi have a more tubular shape than goldfish do and they sport a wider variety of colors and patterns. They also can be distinguished from goldfish by the barbels, which look like whiskers, on each side of their mouth.

There are some fancy varieties of goldfish as well, but these varieties don’t usually do well in outdoor ponds. The plainer, slender bodied varieties are hardier and better suited to pond life.

Koi and goldfish can live together very well. So, if you think you’d like both there’s no reason not to have them. They can even interbreed, although their offspring will be sterile.

It is a good idea to gather as much information as you can about koi and pond care since koi are a bit higher maintenance than goldfish. And who knows…maybe you could call their occasional offspring koi goldfish!

Mainly used for decorative purposes in water gardens and outdoor ponds, Koi, or Japanese carp are ornamental domestic varieties of the common carp. Although they are quite beautiful and hardy these fish are prone to Koi bacterial infection.

This occurs most often when they come in contact with Aeromonas or Pseudomonas bacteria. These naturally occurring bacteria are found mainly in the water of ponds and lakes. They do not exist in tap water because of the chlorine it contains.

However, if you fill your pond or water garden with tap water you will discover that the bacteria can eventually be found in this water too. Once the chlorine evaporates Aeromonas and Pseudomonas are quick to move in. Unfortunately they then have the ability to cause Koi bacterial infection.

The good thing about these bacteria is that they don’t cause much harm when found in low quantities in a clean and healthy pond.

Also, the outer coating or epidermis of the fish protects them from infection. However, harmful bacteria can infect your Koi when its epidermal layer is broken because then the bacteria can penetrate it’s outer cover.

Not only does it harm the fish already present in water, but can spread very rapidly too.

Commonly, when the Koi’s dermis layer is exposed to bacteria, infection can start to spread rather rapidly. This process takes place when flukes use their haptens, resembling small fishhooks, to attach themselves, thus attracting harmful bacteria onto the surface of the fish.

Another thing that can break the Koi’s slime coat is a puncture or scratch from a sharp object, such as a rock, that exposes it to bacteria.

The Koi can also be exposed to bacteria due to poor water quality or stress caused through overcrowding or moving the fish from one pond to another.

So how can these infections be treated? If you are interested in trying some home remedies you can follow the procedures below.

Koi bacterial infection can be present in wounds either smaller or larger in size. Therefore separate procedures are followed to treat them.

When treating small sores use a paper towel to dry off the wound. Next, soak the sore in a solution of hydrogen peroxide on a cotton swab for 30 seconds before you place the Koi back in the water. You need to repeat this procedure for 3 consecutive days.

The treatment for larger sores is similar. The only difference being, after following the same procedure and drying off the wound again, you need to apply a Debride Medicated Treatment on the sores. This procedure also needs to be followed for 3 consecutive days.

However, if this treatment doesn’t work effectively, you may need to seek the advice of your veterinarian. You can also feed medicated food to help heal your fish faster. This method may not always work, especially in fish very small in size.

This advice is for informational purposes and is not intended to replace proper medical treatment by a licensed veterinarian when treating stubborn or severe cases of Koi bacterial infection.

Alan Deacon
KoiCareBasics.com