I would say the duckweed should be grown in a separate system so you can fertilize it, otherwise you don’t get much nutrients available for your Aquaponics system. Some Variables that affect feeding and growth involve; What is the fertilizer you are using to grow the duckweed? Duckweed grows in a pond of non-plant eating fish, is harvested to plant eaters. I don’t like any of it to be genetically modified really! Not all duckweeds are equal. See more ideas about aquaponics, hydroponics, aquaponics system. Add fresh water or tap water to the tray. With the right conditions it will double in volume every 48 to 72 hours. If your duckweed is turning white, something is wrong. Duckweed Propagation. If your duckweed is turning white, something is wrong. He brought us two types, on with smaller leaves and one with larger. Therefore, controlling their population is a must. Tilapia love to eat it. Many of the wonderful claims for the feed potential of duckweed is using the % of protein from it’s dry weight. They offer some great tips on duckweed production. So that was less than a week for 12 small to medium size tilapia to clean up almost 40 square feet of a thick growth of duckweed. For channel catfish, the duckweed doesn’t provide much if any feed. That was a very effective breeding tank for my tilapia but netting fry/fingerlings from the duckweed is even more problematic than netting large fish from a duckweed covered tank. He was studing botany and told us the smaller leaf variety did better in a shady spot and he was right as our ponds were in the full glare of the sun and it was the larger leafed variety which grew well in our conditions. therefore, you may be better off researching using alge. We had to make sure that no toxic or unpleasant chemicals would leach into the water which could cause problems for the duckweed and subsequently the fish. http://blond-logic.hubpages.com/hub/duckweed, The need for predators in tilapia farming. I fogot to add, could i turn the offal from the fish when i clean them into fish meal and feed it to them? Duckweed (Lemnaceae spp.) 3) Being a rich source of Vitamin A and B they can be used as a nutritional supplement for humans. The great thing about duckweed is that it grows fast, doubling in number after about 16-48 hours, depending on the species. Not salty water. How to Care for Duckweed. Not all duckweeds are equal. In fact, quite the opposite is true. 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. “According to the present study, duckweed can be efficiently employed as biofilter within the Nile tilapia (O. niloticus) broodstock ponds for reducing nutrients concentrations, nitrogen and phosphorus. In the integrated tilapia and duckweed recirculating system, the fish and the waters of the tilapia growout ponds provide the nutrients upon which the duckweed will thrive. These folks happen to be big fans of duckweed for feeding tilapia and chickens as well. AND are you calculating in wet or dry weight of duckweed? It is very high in protein, easy to grow and grows very fast. Bigelow Brook Farm IX Series Sequencing Timer, Titan Controls Apollo 2 Repeat Cycle Timer, Would you attend a $150 one Day backyard hands on Aquaponics Workshop With TCLynx at her farm in Yalaha, FL, Aquaponics Association Members Only Big Tent Site. My rabbits and Tortoise will eat it. It can either be fed fresh as the solitary feed, but a combination of 50 percent dried duckweed and commercial pellets or other feed components produces much better results. It seems to thrive where you don’t want it and when you do want it, it doesn’t seem to do as well. In days like these, improveability is also a miracle.). Duckweed is an aquatic plant that is commonly found in lakes, forming what seems to be a green blanket over the water. Duckweed will tolerate low to high light, and soft or hard water. In the case of duckweed the thicker, the nastier, the better. It uses ammonia directly so is good for a system running short of filtration but if you are trying to grow veggies in your aquaponics system, growing duckweed in your aquaponics system will be robbing your veggies of nutrients and by using the duckweed as fish food you won’t be putting enough nutrients into your system in the first place. Hell, I’ve never even done aquaponics yet. But from the ecological perspective that I *am* familiar with, once you account for the vast amount of land-acreage, sea-acreage, mining resources, fossilized energy, and raw human labor required to produce commercially-prepared fish feeds out of animal byproducts and grains and… well, let’s just say that if you took that same 40 sq. Compost teas or organic hydroponic nutrients also do well. There just isn’t enough “organic” or non GMO fish feed out there yet. I understand that too much mammal protein is not good but how much is too much? I once set up a duckweed tank. Your local weather forecast can help you determine what your UV index is for your area. The concept of aquaponic is plants thrive on fish waste. The manual gives an explanation of the biology of duckweed, and details the methods of duckweed farming. System was running on a 30 watt water pump and a 5 watt air pump. I put 12 tilapia between fingerling and breeder size into this 16 foot by 30 inch by 18 inch deep tank covered with a thick growth of duckweed. There have been studies that say if you are feeding an appropriate commercial feed, you can replace up to about 50% of the daily feed with duckweed before they start loosing weight. Although, duckweed is a portion of good natural food for some fish species, if present in excessive amounts, it can hart the pond environment and its habitats. Save my name, email, and website in this browser for the next time I comment. *That’s* the real miracle, the thing’s space and processing requirements as a feed *component*. Then I decided I would put some tilapia in the duckweed tank. The cover of duckweed remained good. (in other words, what is the nutrient makeup of your duckweed?) Learn how your comment data is processed. Since duckweed is NOT a complete feed, (there hasn’t been as extensive a study on using it as feed under commercial conditions and therefor you are unlikely to find any exact answers as to how much you need to feed some given amount of fish let alone detailed descriptions of methods) Some people raise tilapia 100% on duckweed but if you want faster gains, go with at least 30% feed. Non-leaching. Take into account it’s failings and challenges before getting too enamored with it. If you are not trying to grow it, it seems to do far better. You could always try but I don’t even raise tilapia anymore let alone do diet research on them so I’m not much help there. Cindy, grow your duckweed and feed fresh to tilapia in addition to a reduced amount of fish feed. Then I decided I would put some tilapia in the duckweed tank. If I wanted to keep 300 tilapia in a tank, how much duckweed do I need to grow in square feet, cubic inches, ounces…? Duckweed (lemnaceae, water lentils) family are the smallest flowering plants and probably the fastest growing plant, capable of doubling its weight in 24 hours.Because of the very high productivity per surface area, duckweed holds great potential for future global villages. Since flood and drain is NOT desirable with a duckweed system, one could set up a minimal height variation system using only air to provide flow via airlift pumps and reduce the problems with pump clogging due to duckweed covering pump grills (when duckweed dies the roots sink and can cover pump screens with a fine hairy slime.). Duckweed grows rapidly and can quickly choke out ponds and tanks if allowed to grow unchecked. The pond is harvested twice weekly and the fish sorted into various groups for return to the lagoon or sale. What are the conditions you are growing the duckweed under? So while you might be able to manage a low energy fish/duckweed system, I would definitely recommend keeping aeration going especially at night. Follow me on Instagram @nikzboz , Namaste! However, I suspect the diet would still be lacking in some things and probably too high in other things to be a good balanced diet for growing out tilapia at all rapidly. Disinfect the duckweed. I wouldn’t know. I don’t know. length, 12-in. At this stage, the tilapia farmer's goal is to raise the tilapia to harvest size quickly, economically, and in good health. It literally grows like weed, but it is very useful. However, if your not running aquaponics and you need an ammonia sink, then perhaps recirculating water from the fish tank through a large shallow pond plant bed in a shady location and a little aeration will grow a good amount of duckweed that you can then scoop off and give to the fish regularly. The duckweed is dying. I was feeding the fish daily (over by the aerator where there was a circle of clear water to drop the feed in.) Then I had to go away for a week and I didn’t have an extra automatic feeder to hook up for the duckweed tank but I figured they would survive under the duckweed. Duckweed is one of the most common pondweed problems. There is no secret. Duckweed is favored by goldfish, tilapia, koi fish, and other fish varieties and provides a nutritious and protein packed food source. This site uses Akismet to reduce spam. What does that mean? (And someday maybe the geneticists will start tinkering, and we’ll have a complete-protein duckweed too. We had not seen this plant growing locally but luckily a friend of ours, found some in a pond in the mountains near here. Place disinfected duckweed in a tray (plastic) with 12-14 inches of depth. Introduction. I was not successful with my first attempt. Duckweed also happens to be very rich in proteins. Thank you again! Robust. New healthy fronds of duckweed will grow in the aquarium and can be added those in the tilapia pond or pool to keep your crop healthy and encourage new growth. My husband and I have a small farm in northern Brazil where we raise tilapia for the local market. If you want complete feed for your tilapia, you can always do green water culture and let them eat algae which can be a complete feed for them (well along with all the other little critters living in the water that they eat.) Or a combination of those two and something else? Duckweed MAY be the food of the future. You can grow duckweed indoors by following these simple steps: Buy about 50- 100 duckweed pods and place them in a container. The pump was down in the barrel that was set a few inches into the ground so the top of the barrel and the top of the duckweed tank were about the same level. Here are the tools you’ll need to culture one of the most nutritious foods for your pet: Rectangular plastic container (at least 5-in. …I’m not saying duckweed is a miracle from the perspective of the fish farmer or anything. Temperature should range from 63 to 79 degrees F. (17-26 C.). And if there is a die off for some reason, the duckweed like algae decomposing in the water can quickly increase the biological oxygen demand in the system and rob it of oxygen leaving your fish to suffer. Don’t forget nutrients! After 1 week fermentation, the liquid part is extracted and diluted with water for foliar spray while the solid part is use for livestock feed. Great going guys!! Rearing, or grow-out, is the part of tilapia farming that picks up after the hatchery has raised them to fingerling size. 2) Due to the high protein content, Duckweed's are excellent feed for chickens and livestock. We do not profess to be experts at growing farm-raised duckweed to feed our fish. It can either be fed fresh as the solitary feed, but a combination of 50 percent dried duckweed and commercial pellets or other feed components produces much better results. Once it is in a system it tends to get everywhere. We needed something that was tough enough to resist being damaged. farming is gaining attention as a combination of water purifier and fish and animal food in developing countries. Now this was in our WARM part of spring here in FL so those small tilapia had started breeding and I had lots of small fry/fingerlings growing in that duckweed tank after a while. Duckweed as Tilapia Food. ft. and planted only the appropriate ratio of wheat, soybeans, hay for animals’ offal, etc., you’d be feeding much, much, *much* fewer than 12 fish with your year’s harvest. The Duckweed definitely seems to grow better in aerated water though it doesn’t like much surface agitation or water level fluctuation. The Integrated Tilapia & Duckweed Farming System -- The fish and the waters of the tilapia growout ponds provide the nutrients upon which the duckweed will thrive. You can raise tilapia solely on duckweed. When you are trying to cultivate it, it seems to be more picky about conditions. Well I would say you need at least 40 square feet for each dozen tilapia if you are feeding only about 50% of their diet as duckweed. Duckweed can provide all the protein needs of tilapia and carp — which is why it works great for aquaponics. Grown under ideal conditions, duckweed ranges between 25% and 45% protein and doubles its growth every 36 hours, and OUR TILAPIA love to eat it along with their fish chow. Often bits of twigs might end up in there. 1) Ideal feed for common goldfish, grass carp, tilapia, etc. The plants attract tiny critters which the non plant eating fish love! We use the tilapia waste water to grow our duckweed, but you can use other nutrients. Duckweed needs more than water and sunlight to grow. Don’t forget nutrients! Duckweed is widely used as a less expensive alternative in the phytoremediation process. Chickens- feed fresh duckweed as a supplement for better color in eggs and meat. It was 16 feet long by about 30 inches wide and 18 inches deep. Recommended stocking rates are 15 to 20 pounds of mixed sex adult Mozambique Tilapia (… They grow quickly and takes a little time to cover up the whole pond. Duckweed needs more than water and sunlight to grow. Duckweed can be fed fresh as the only feed, or in combination with other feed components in a polyculture of Chinese and Indian carp species with tilapia. Duckweed is a fine thing but it is not the miracle some people get distracted into thinking it is. I must say that duckweed is handy, sort of. (feed and protein needs vary greatly as tilapia mature.) That is just my experience, ya have to trick it if you really want to grow it. We had to have a strong plastic liner. Could I feed the fish 50% duckweed and 50% black soldier fly larva? It is an extremely tolerant plant and does not have very specific growth requirements. Herbivorous and omnivorous fish such as grass carp (Ctenopharyngodon idella), silver barb (Puntius gonionotus) and tilapia (Oreochromis sp.) The Integrated Tilapia & Duckweed Farming System — The fish and the waters of the tilapia growout ponds provide the nutrients upon which the duckweed will thrive. Anyway, So I had this duckweed tank and we gathered wild duckweed and kept it in this separate system for a while. Also duckweed can clog filter screens, pump intakes drain grills etc so keep that in mind. It is a hands on process I believe :). The plants attract tiny critters which the non plant eating fish love! The duckweed is dying. Duckweed is a hardy plant, fast-growing, protein-rich and requires only simple technology. Don't use too much, might cause an algal bloom but eventually the duckweed will Triumph. The Integrated Tilapia & Duckweed Farming System. Most of goldfish, tilapia, koi fish, and other fish variety like to eat duckweed and they really love it! Compost teas or organic hydroponic nutrients also do well. deep, 18-in. I need more clarification on adding manure. And quite frankly, as soon as you are actually trying to grow duckweed, it is no longer a weed and suddenly tends not to grow like one so much anymore.