Have the kids moved away, leaving your pool sitting useless in your yard? It’s a natural but rare step to take that unused space and turn it into a haven for fish!


Repurposing old Swimming Pools

If you want to change your pool into a natural fish farm, you’ll be turning off the equipment you needed when the pool was used for swimming. How well do fish acclimate to an old inground pool? Surprisingly well!

Your friends might think you’re nuts to stop adding chlorine to your pool and let nature take it over. The water certainly will not look – or be – suitable for swimming anymore. It takes time for the chlorine to leech out and until it does, the water is too toxic for fish.

Once you get some mosquito larvae in the water, you can start adding fish. For filtering, you can simply use old bathtubs, lined up and filled with gravel. A pond pump re-circulates the water through this line and then it is sent to the pool after filtration.

Growbeds should be stocked with water plants suitable for the type of fish you will be introducing. The system should be balanced, providing water in which your fish will thrive.


Fish Farming

The goal is to reach the point where your fish farm/retired pool is self-regulating and self-cleaning. Using aquatic plants hastens that conversion. Microscopic animals will move into your system and then fish thrive on the small insects they attract.

If you build the fish farm in a natural way, you don’t even need fish food! If the ex-pool becomes like a pond, it supports its own fish and they can find plenty of food. Some fish in these farms grow even more quickly than fish that eat commercial fish feed.

You may get to welcome the croaking of frogs in your pond area, too. And where many people spend a lot of money to keep algae from their ponds, this is actually counter-productive. Algae helps in feeding fish. You’ll even save money, since you’re not running your main pool pump anymore. Just a small sized trickle will provide air back into its system.


Even if you take the process slow and let nature add what she wants to the pool/pond, you can be raising many fish at the end of your first year. And naturally raised fish like these are quite healthy for you.

image courtesy of ecofilms.com