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 Post subject: Glossary Of Terms
PostPosted: May 29th, '06, 19:00 
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The controlled cultivation and harvest of aquatic plants or animals.

a hydroponic technique involving the use of sprayers, nebulizers, foggers, or other devices to create a fine mist of solution to deliver nutrients to plant roots.

This is the first step in the nitrogen cycle. Ammonia is generated by fish urine and by the decay of dead fish and plant material. It is perhaps the deadliest agent to tropical fish. Care must be made to ensure that the ammonia levels stay at zero.

Intermediate nitrogen compound in the biological conversion of Ammonia to Nitrate in the Nitrogen Cycle. Nitrite is toxic to fish, but less so than Ammonia.


It is the last stage of the aquarium nitrogen cycle and is converted from nitrites. It is harmful to aquatic animals in high concentrations.


a bacteria responsible for changing nitrite to nitrate

a bacteria responsible for changing ammonia to nitritre

The growing of plants without soil by using an inert medium such as sand, peat, or vermiculite and adding a nutrient solution containing all the essential elements needed by the plant for its normal growth and development.

the integration of aquaculture and hydroponics

Nutrient film technique (NFT)
In this method, the plants grow through light-proof plastic films placed over shallow, gently sloping channels. A steady flow of nutrients is maintained along the channel, and the roots grow into dense mats, with a thin film of nutrient passing over them (hence the name of the technique). A downside of the technique is that it has very little buffering against interruptions in the flow e.g. power outages, but overall, it is probably one of the more productive techniques in hydroponics

Deep Water Culture (DWC)
a hydroponic method of growing plants in which the roots are suspended above, and allowed to drop down into an aerated nutrient solution. This is not natural but with a properly aerated solution the roots can be continually submerged without problems because the roots take up nutrients in the presence of oxygen. The solution is usually aerated constantly by using standard aquarium pumps and air stones, which deliver oxygen to the roots. The container holding the roots and aerated nutrient solution must be completely light proof in order to prevent algae growth. The solution must be topped off from time to time.

Flood and Drain (or Ebb and Flow)
In its simplest form, there is a tray above a reservoir of nutrient solution. The tray is either filled with growing medium (clay granules being the most common) and planted directly, or pots of medium stand in the tray. At regular intervals, a simple timer causes a pump to fill the upper tray with nutrient, after which the nutrient drains back down into the reservoir. This keeps the medium regularly flushed with nutrient and air.

Uninterruptible Power Supply. A special power source which takes over in the event of a failure in the main power system.

SLO drain
Solids Lifting Overflow. Also known as Venturi Drain, used in Chift Pist (Constant Height in Fish Tank, Pump in Sump Tank)

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