Not only do fish brighten up a pond, they also play in important role within it. We’ll reveal which kinds of fish are especially good to have in your pond.
The undulating body of a fish through water is without a doubt a beautiful and relaxing image in any garden pond. But pond fish don’t just look pretty – they also complete important tasks. For example, they feed from the bottom of the pond, thus keeping it clean and aerating it, and eat bothersome mosquito larvae. Of course, useful insects also fall victim to the ravenous appetites of goldfish, coy & friends. Therefore, every fish pond should also always have a swampy area, where small creatures are safe.
Above all, the size of your garden pond determines which fish are best for you. The various goldfish species, like comets, sarasas, shubunkins and yellow goldfish, as well as koi, need quite a bit of space. The basic rule of thumb is: Every grown fish between 30 and 50 cm long should have at least 0.5 cubic metres of water (for koi at least 1.0 cubic metre per fish). Since goldfish and koi ought to be kept in shoals, your pond will have to be consistent with these requirements.
Although these larger species look particularly attractive in a garden pond, there are also drawbacks compared with smaller pond fish. For example, an owner generally needs to give koi and goldfish supplementary feed. Moreover, you will most likely need a filter and a pump if you have these fish. And of course, the number of goldfish in particular could skyrocket. Once that happens, you will be left wondering what to do with all of the babies. Koi are bottom feeders, which can lead to cloudy water in some places.
No matter which species you decide upon, you should only buy fish from a breeder or in a specialty store. Catching fish in the wild is not only forbidden, but also unhealthy. You never know what kind of dangerous pathogens fish from uncontrolled origins could possibly bring into your pond. It also goes without saying that you can’t place your fish in other bodies of water.
Adding fish to the pond
If you have bought fish for your garden pond, make sure before adding them that they will not face any rapid water or temperature changes. First put the fish in a bucket with the water from the speciality shop, then add 250 ml of pond water approx. every five minutes. Repeat this process until the water constitutes about two thirds pond water to one third transport water. If the fish become restless, increase the amount of time you wait between adding pond water to every half hour. In this way, the fish can slowly get used to the new water. It is also important to use an air stone to diffuse air during this acclimatisation period.
Young fish that are added to a garden pond with mature orfe, koi or other goldfish should generally be added after dark. By doing so, you significantly reduce the risk of the larger fish seeing the younger ones when you add them to the pond and viewing them as dinner. To play it safe, only buy new fish that are about the same size as all of the others in your pond.
Fish that are particularly suitable for a garden pond are koi, common minnows and goldfish.