Growth requirements for pH are broad (6.5-7.5) and duckweed can even survive in alkaline water up to about pH 9. The run-off created from intensive farming methods can cause an ecological nightmare if left untreated and allowed to leach down into the water table. The problem is that these isolated colonies are experts at … You made a good point about grey water here, but I still think it is good to encourage the use of ecologically friendly cleaners as well. to line up! They can survive in a pond where little to no life can thrive. Lower dissolved oxygen (DO): Because duckweed inhibits algal growth, the lagoon doesn’t receive any of the natural oxygenation that algae provide. Alternatively, a water oxygenator can be used. Hello there! After several minutes, you will notice that the duckweed starts to spread out of the surface of the water and some at the bottom begin to rise on the surface. Additionally, that combined with the mat blocking out sunlight can result in the death of submerged vegetation which can have cascading effects on the rest of pond life. Human activities have, in general, resulted in much higher flows of minerals and organic materials through aquatic systems, often leading to eutrophication and a huge drop in the biomass produced in such systems. I agree with you here. Duckweed (scientific name Lemna) is a small bright- green plant, about the size of a fat flake of oatmeal, which floats on top of water bodies. This is especially true in clearwater systems with lots of submerged vegetation. I have worked as an aquatic ecologist for years and often we see the creates fluctuation in O2 levels in systems that are heavily vegetated. Duckweed does not normally grow in rivers unless there is a reduced flow of water. Duckweed is one of the best water purifiers that you can invest in for your fish tank. Keep up the good work. When it dies, it does use oxygen in the process of bacterial decomposition. The water becomes largely anoxic, which in turn favors denitrification. Common duckweed (Lemna minor)By Walter Fertig. 4. ( Log Out /  Duckweed is a stemless, aquatic flowering plant. Im trying to grow duckweed for an experimental purposes. I have it in my 4 – 500 gallon fish ponds as I feel it helps my little fish with water quality and cover. The New Pond is always  highest and the Old Pond, covered in duckweed, is lowest. Aerobic bacteria thrive off increased oxygen levels, resulting in improved water quality and natural decomposition of organic matter—reducing duckweed and other plant life. We are subjected to so much ‘truth’ that has been altered to make a sale of some product that a person really has to read carefully. Remember to keep in mind that all water and bog plants don’t take up all heavy metals. Myths abound, but it’s getting better out there in media land. My pond is covered by duckweed so I am wondering if this would increase frog winterkill? It seems I will never rid myself of this pesty plant. 4. I suppose Thank you a million and please carry on the enjoyable work. diverted water into ponds full of duckweed and then allowed it to percolate through the soil and into rivers. A solid covering of duckweed does block sunlight which inhibits algae growth. Keep doing this repeatedly all this summer. Nitrification of ammonia occurs within the aerobic root zone of duckweed. Of course, while duckweed may have its place in the laboratory or in the feeding trough, it doesn’t belong in your small pond. It also reduces water evaporation out of ponds helping to conserve water. Duckweed and oxygen Oxygen levels in my three ponds over the last few days. If you want to maximize its growth, provide full-spectrum light from an aquarium lamp or direct exposure to sunlight. Agree though, that grey water is still a problem and pond water and pond and. 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