Keeping An Outdoor Fish Pond


Many homeowners enjoy the beauty and sense of calm a fish pond provides.   Many look at the fish pond as a hobby and do not mind the maintenance required to keep the fish pond healthy and beautiful.

Your fish pond can range from very small to a larger more elaborate pond.  The pond may be lined with vinyl or it may be made of fiberglass or concrete.

You want to be sure to add plants and fish consistent with the size of your pond.  Too many fish in the pond is unhealthy and possibly deadly to the fish.    Before introducing fish into the pond place the fish in another container and gradually add some water from the pond so the fish can adjust before placing them in the pond.

You want to be sure the water in the pond is kept clear.  Algae can develop on the pond from too much sunlight and from carbon dioxide and dissolved mineral salt.  To help avoid algae growth keep enough plants in your pond to cover and shade approximately 50 percent of the surface.  Be sure to remove any dead leaves or flowers or any other organic matter that is rotted.

It is a good practice to change a portion of the water in the pond on a regular basis either weekly, bi-weekly or monthly.  You may want to change about 10 percent of the water weekly instead of 40 percent of the water on a monthly basis.


If your pond should develop a leak or the water level is dropping you need to find the cause.  Is the pond level or is water coming from a low sloping side.  If you cannot ascertain a problem from the outside of the pond you will need to drain the pond to find the problem.  Put the fish with some water from the pond into a container while you repair the pond.  If the liner is vinyl you may repair it with a double sided adhesive tape to secure a patch over the puncture.  Allow the tape to set for at least an hour before refilling the pond.  Fiberglass ponds can be repaired using a fiberglass repair kit.  Allow this to dry completely before refilling the pond.  With a concrete pond use mortar to repair the crack and refill the pond after the repair has been allowed to dry completely.

Oxygen is necessary for the fish to survive.  You may want to use a pump and filter to keep the water moving and clear.

In the fall you want to continue to remove any dead leaves or plants.  In addition you may want to cover the pond with netting to keep out falling leaves and debris.

In winter the ice forming on the pond can cause methane gas to be trapped.  Ice also will create pressure on the sides of the pond.  Floating a ball on top of the pond can prevent the pond becoming completely covered in ice.