I have a big concrete fish pond. from around 20M3. Mostly Tilapia in it. Around 6 big ones (30cm), 30 medium sized ones (10cm), and a few hundred very small ones (2cm)There is also some duckweed and waterhyacints in it.
I have already a long time an hydroponic system, we mostly grow Morning Glorie (Pak Boon) in it.
Now I placed the hydroponic system in my fish pond, and circulate my pond water through it. I started with around 25 plants. It looks like there is not enough food in the water to keep the plants happy.
Ph value is around 6.8. Is there a way to give fertilizer to the plants without harming the fish? Or should I wait till the small tilapia are bigger? Any other ideas?
Thanks for reading!
Arjen.
I know this is a fairly old post but I have a little bit of input that might be useful to have on the record here in this thread.
First of all this NFT system you have here is not really recommended for Aquaponics because of the solid waste from the fish. If you have a really good filter system then you can get away with it but otherwise any particles of fish waste passing down those pipes will get stuck in the roots and go nasty.
Also you have highlighted the aquaponics problem of having loads of nitrogen but little else, this has been a particular frustration for weed growers who want to grow aquaponically. Because you cannot add nutes without poisoning the fish. There is actually a way of doing it but it's a bit of a pain. Maybe worth it for weed, probably not for lettuce. Essentially the roots are split into 2 zones, half of the roots go in the aquaponic water and half into seperate hydroponic water (with the supplementary nutes).
Hydroponic Farming
in Farming in Thailand Forum
Posted
I know this is a fairly old post but I have a little bit of input that might be useful to have on the record here in this thread.
First of all this NFT system you have here is not really recommended for Aquaponics because of the solid waste from the fish. If you have a really good filter system then you can get away with it but otherwise any particles of fish waste passing down those pipes will get stuck in the roots and go nasty.
Also you have highlighted the aquaponics problem of having loads of nitrogen but little else, this has been a particular frustration for weed growers who want to grow aquaponically. Because you cannot add nutes without poisoning the fish. There is actually a way of doing it but it's a bit of a pain. Maybe worth it for weed, probably not for lettuce. Essentially the roots are split into 2 zones, half of the roots go in the aquaponic water and half into seperate hydroponic water (with the supplementary nutes).