I'm pleased you enjoyed the article. Question: I have an aquaponics system with tilapia in IBC tanks. Other plants are being grown for bio-fuel but none grow with the rapidity of duckweed. Single celled green algae are usually the most abundant pelagic algae, and these are usually the most digestive forms. One of the most important benefits of the duckweed produced in the integrated system is that it can be used as a readily accepted supplemental feed for the tilapias. Where we live, it is 87°F (30°C) year-round and we get a UV index of 11 which is in the extreme range. Mary Wickison (author) from Brazil on March 20, 2015: Normally when I try to recycle trash, I end up with ...different trash. I've branched out lately and began harvesting some of the plants that grow from the bottom up, which are much more fibrous. Each tunnel system has its own bio-filter and solid removal filters. When feeding on this algal flora, the fish rasp the algae off the substratum using their chisel shaped mandibular teeth and the food is then processed in a similar manner to that previously described. We went to the duckweed ponds and there were frogs, croaking, there necks billowing out with each croak. Answer: No, there is no oxygenation of the water. We have a farm here in Northern Brazil where we raise tilapia for the local market." I live in a small country called Swaziland in the southern part of Africa. The best protein digestibility occurs at 25 °C and the optimum dietary protein to energy ratio was estimated in the region of 110 to 120 mg per kcal digestible energy respectively for fry and fingerling. In a couple of days, you will have a rapid growth of duckweed.If the roots are long, more than a couple of inches, you need more manure. The reason we decided to grow duckweed was to feed our tilapia. Supplements can be added to the water to achieve pH stability if needed. Stop mosquitoes breeding and you drastically reduce the number of illnesses and deaths attributed to them. These can be thrown away without any problem to the environment. I live on a suburban pond which can sometimes be overwhelmed by duckweed. The specific growth rates (SGRs) of tilapia were 1.51±0.07, 1.38±0.03, 1.31±0.06, … I am planing to start a tilapia production project in Swaziland to supply our local market. The duckweed is a great cover for them to hide beneath. Feeds usually constitute the most important operating cost for any farm and efficient growth and food conversion are the main keys for profitability. Question: How long does the common duckweed live? Fresh duckweed plants appear to be a complete nutritional package for carp and tilapia ponds. You will end up with too many fish with stunted growth. Biological Management Options. I had no idea. Then I thought I ought to use the scoopings for mulch/fertilizer for the herb garden. Thanks you, this info can be very helpful to me. Waiting for ur reply thanks.. Mary Wickison (author) from Brazil on April 30, 2017: More manure should get your duckweed growing again. This is a very informative hub about duckweed, I never thought, duckweed is this helpful. Voted up and shared. For cleaning the water, water hyacinths are an excellent plant and can then be used as green matter in a garden. It’s FREE! Although those cages could take 600 and 900 fish respectively, we had about half that amount. If they don't, remove as much as you can because it will spread. The present study evaluated Nile tilapia when fed on dried duckweed in combination with commercial feed, aiming at reducing production costs. This was then loaded onto our kayak to take to the tilapia … Not to eat, as they are carnivores. Both duckweed and algae like a nutrient rich environment and it is really a matter of controlling one and allowing the other to grow. Answer: You have various options, and some may be better for you than others depending on where you live. I still pass our water through a charcoal and pumice filter before drinking. **If you only have one pond of duckweed, keep some of your plants in a jar of water to use as a starter. Will replace water and now premix quail manure before adding to the pool. The main challenge is the cost of commercially produced feed, it is financial impossible to produce tilapia on commercial feed alone and still compete with the price of imported frozen tilapia, hence why i started looking for an alternative feed source and came across your blog. Duckweed has many uses such as bio-fuels, human and animal food and as a water cleaner. Here on our farm we drink well water. Answer: The duckweed wouldn't become a problem if you can contain it. Where I live, in Brazil, there is a lot of bio-fuel used. Now however, duckweed is being touted as a miracle plant for many reasons including the following: Duckweed loves muck. Right? I would suggest you have your water tested to ensure it is safe for consumption. People sell it on Ebay! It's a win win situation. We put in more than we thought they'd eat. Suck on the end until water begins to flow out. Tilapia Feed - Duckweed is a tiny aquatic plant covering stagnant water bodies; it's seen in channels and waterways in semi-tropical and tropical climates in most countries. Locally there is a man who rears his to 2 kilos but he has a very small manageable enclosure about the size of a small swimming pool. My tilapia gorges on it before it sinks! Thank you. They like mucky water with fertilizer in it. I think duckweed and other renewable sources of water based plant material will have a far greater role to play in the future. If we had bought the fish too small, they would have passed through the netting and into the lake. Nile tilapia requires the same ten essential amino acids as other finfishes. Cheers! The more closely spaced micro-gill rakers may trap the remaining algal cells in the exhalant water. Always clean your net after using to prevent any bits of duckweed from dying on the net and causing a blockage. ... carp, and tilapia fish. Tilapia rendalli feed predominantly on aquatic plants found around the margins of lakes and dams. In some places, it is considered an invasive species and people want to eradicate it. This finding suggests that Cd transfer from duckweed to tilapia can be quantitatively evaluated when tilapia is exposed only to duckweed. Diseases transmitted by mosquitoes are estimated to kill 2.7 million people per year. If you can't beat them, eat them. I like the idea that it can be used as a preventative for mosquitoes, though it would seem it that if it prevents mosquitoes from laying their eggs, it would prevent oxygen from getting into the water. Duckweed to Feed Tilapia in Aquaponics – The Food of the Future – by Colle and Phyllis Davis. They are a problem here as they are in Australia. Especially the protein in duckweed was converted highly efficiently and this is advantageous because protein is considered to be the most costly item in fish feeds. I have seen other ponds and swamps, in the deeper South, where it grows like wildfire. I had no idea it was so useful! Mary Wickison (author) from Brazil on March 19, 2015: Thank you for your kind words, vote and sharing. We started with 30g and 50g tilapia. Regarding the relationship of the plants in the pond, yes, everything in that pond will be interconnected. Duckweed however is different. So for example when you go to a gas station, there is a pump for normal gas, diesel and also alcohol which is a bio-fuel. Got plenty of folks dumb enough to lick them though! What a marvelous way to do so many things. Many a night, during the mating season, we have many frogs in the duckweed ponds. So often the answers to many problems, are right under our noses. Question: Is duckweed good for my outdoor guppy and guppy fry ponds? You are a delight and inspiration Mary and thank you so very much for all of the great, to the point and useful... (and too rare!) I've noticed for many years that I never have mosquito larva in the half wine cask containing my small goldfish, where I once added a teaspoon of duckweed from a local waterway near a California coastal estuary. Happy from Toronto, Canada on June 14, 2012: "The reason we decided to grow duckweed is to feed our tilapia. Many people don't like this plant because it can overtake a body of water. Free delivery on … What happens is it goes on the bank and dies. Or at least to use in conjunction with spraying. There is always work to do on the farm.LOL. The full article is for subscribed members only. Remember, when you calculate the dimensions, you need to leave enough for the ends and the sides. For some duckweed is a menace, for others it's a Godsend. It was all a matter of getting enough circulation to keep the tank clean and having the water be still enough that the duckweed would survive. As a matter of fact, I got a few shots of water moccasins in a swamp in a NWR covered with the stuff. When we put them in our ponds, they began reproducing, so I have never kept any back to see how long one plant would survive, they just keep reproducing when in a suitable growing medium. I seem to recall that Talapia can muddy clear water (though not as much as carp). Tilapia Food. I would say duckweed could be an ideal way to help feed your catfish and reduce feeding costs. For those of you who don't know what duckweed is, it is a small floating plant that grows on still ponds. Because we had our duckweed growing year round, there was never a reason to dry it. 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