Goldfish in the garden pond: This is how you avoid problems

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If you want to keep goldfish in the pond, you should pay attention to a few points in order to avoid problems and to enjoy the attractive ornamental fish for years to come. In short, a suitable location (neither in the blazing sun nor in the immediate vicinity of tall woody plants), a sufficient depth of water and pond size, as well as a varied planting and good ventilation ensure the well-being of the goldfish. Ideally, one third of the pond is always shaded by a wall or building so that the water does not get hot. From 120 centimeters deep, goldfish in the pond can easily overwinter.

Too many goldfish in the pond destroy the balance

In ponds, there is a constant redistribution of nutrients: plants grow, consume nutrients and later return them when they die and decompose. In animals, it is similar, with the nutrients go through their excretions directly into the water. There they do not stay long, but are quickly put back into new plant growth. The pond is therefore in the so-called biological equilibrium and provides itself almost with nutrients and aquatic plants. And ensures clean water all by itself. The pond gets at most a small additional snack in the form of fall foliage from the outside.
The bigger and deeper a pond is, the better it copes with small fluctuations in this cycle and heats up in summer not so fast. If the outside gets too many additional nutrients into the water, the plants can not do anything with it - but algae do. These then grow so fast that they consume all the oxygen from the water, causing it to "tip over" and become a murky broth. Fish feed also acts like fertilizer and passes directly into the water via the excreta of the animals.

Too many goldfish in the pond

If you hold too many goldfish in your pond, the biological balance gets mixed up

And so we would be with the main mistake that many pond owners make: they hold too many goldfish in a pond. When first stocking fish, it is like the first planting of a garden: you like to exaggerate and use too many fish or plant too close - a cardinal error that can not be repaired later. The right fish stock is two goldfish per cubic meter of water.

With these tips goldfish feel comfortable in the pond

1. The right pond planting
A richly planted pond is better than a puristically furnished pool. Underwater plants such as crab claws, hornwort or millipedes enrich the water with oxygen, get their nutrients directly from the water and offer fish good hiding places. Also floating plants such as frog bite or vigorous swamp plants such as swans and cattails devour nutrients and act like natural sewage treatment plants.

Pond planting with water lilies and cattails

The right pond planting ensures clean water

2. The right amount of food
If there are only a few goldfish in the pond, they can even live as self-caterers because they feed on parts of plants and small aquatic insects. If many fish are swimming in the pond or if the pond is only spartan, you have to feed it - but if possible so that everything is consumed. To get a feel for the right amount, place the food in small portions in special, floating feed rings. What has not eaten after two minutes was too much and will sink to the bottom, rot and grow algae. Fish the leftovers and give it less next time.
3. Purchase filters
The larger the pond, the lower the technical effort. In small ponds or with high fish stocking one does not get by without technology. Water filters clean the water mechanically and also remove pollutants with activated carbon. Effective are filters with UV light. The pond water is passed through a glass tube and irradiated with UV rays. This kills germs and suspended algae that would otherwise cloud the water. Filters cause a certain amount of restlessness in the pond when they run day and night. It has been proven to select the filters one size larger than necessary and then let them run for only a few hours or at night.
4. Ventilate small ponds

pond aerator

Small effort, big impact: Pond aerators provide sufficient oxygen supply

Small ponds need an extra dose of oxygen in addition to the filter. Often enough already a water feature, a fountain or a small stream, in which water over cascades back into the pond and absorbs oxygen. If that's too time-consuming, install the pond aerator, which constantly "bubbles" oxygen into the water.
5. Regular pond cleaning
Always remove dead or proliferating plants from the pond - and thus the nutrients bound in them.So-called pond skimmers automatically clean the surface of the water and collect leaves and insects that have fallen into the water in their collection container. In the fall, a leaf protection net looks like a bodyguard and rejects the masses of fall leaves, which are blown into the water by the wind. At the bottom of the pond, nutrient-rich mud accumulates over the years, which should be extracted with sturdy nets or suckers.

Video Board: Treating external fish parasites Fish lice, flukes and Trichodina in a koi and goldfish pond.

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