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The aquaponic system I will be utilizing is a scaled down version of the University of the Virgin Islands commercial scale system.
Aquaponics has several advantages over other recirculating aquaculture systems and hydroponic systems that use inorganic nutrients solutions.
If I were to begin stocking fry of an average weight of 27.5g on Saturday, August 4, I would begin to harvest them on Saturday, December 29, at which point they would weight and average of 717g. As any of you serious aquaponic guys or gals who are familiar with the UVI system may have noticed, my system falls a bit short in terms of aeration.
Total yields over a year are $2,964 for fish, $19,474 for plants, and $715 for freshwater prawns.
And, so, in closing, here is some absolutely useless information to store along with other useless information we’ve all picked up over the years. So, I’m going to devote the month of June and probably a bit of July to building the first unit of what I hope will be many more units to come. Nutrients, which are excreted directly by the fish or generated by the microbial breakdown of organic wastes, are absorbed by plants cultured hydroponically (without soil). It is a proven system and detailed information relating to it is freely available, including some of this text which I am, honestly,  guilty of plagiarizing freely at times.
The hydroponic component serves as a bio-filter, and therefore a separate bio-filter is not needed as in other recirculating systems. My design is meant to get the same results or better than the UVI system but at a much less expensive initial cost.
A clarifier, otherwise known as a swirl filter and other such names, removes the lumpier pieces of fish waste.
The pump will reside here and replace the water that has flowed by gravity from the rearing tanks through the other system components.  There will be certain losses due to evaporation, plant uptake, leaks, etc. In fact, they will be expected to consume between 3,978 and 4,099g of high quality pelleted food a day. The 30 fish harvested each of the following 3 weeks would weigh 767g, 817g, and 867g, respectively. I hope to make up for this by splashing the return water from the sump into the rearing tank. Tilapia are moderately expensive in Laos, and especially on the Bolaven Plateau as they normally need to be trucked up from warmer climates. The Japanese raccoon dog, or tanuki as it is known there, is famous for the immenseness of its balls (male tanuki, that is).  These over-sized testicles symbolize financial luck.


His interest in Asia, especially Japan, took him overseas, where he's been an expat his entire adult life-- assuming he ever grew up.
This post is meant to be an overview of the system so that any aquaponically-inclined readers may warn me of potential catastrophe.
Aquaponic systems have the only bio-filter that generates income, which is obtained from the sale of hydroponic produce such as vegetables, herbs, and flowers. In some ways it is more complicated because I will be trying to control the environment with what I think is a pretty cool greenhouse design and making use of passive solar energy for water heating. At least those are the numbers I get when I apply the data from Nam Sai Farms’ trials on fish growth and feeding rates to 6 cohorts of 120 fish stocked 4 weeks apart. According to my calculations, after 6 weeks the average weight would be 138g and they would be consuming 3,660g of feed a day.
In fact, the other day at a market in Vientiane I could hardly find any, and what I found was a poor excuse for lettuce. It also protects the plants from harmful insects, but I’m hoping insect netting will perform this task suitably.
He works as a sales rep for the greatest Japanese company there is, splits his time living in Thailand and Laos, and cannot stop getting involved in things well over his head. As the aquaculture effluent flows through the hydroponic component of the recirculating system, fish waste metabolites are removed by nitrification and direct uptake by the plants, thereby treating the water, which flows back to the fish-rearing component for reuse.  In my system tilapia will be produced along with a variety of herbs, leafy plants, vegetables, and perhaps fruits. In the UVI system, which I copy, and which employs raft hydroponics, only calcium, potassium and iron are supplemented.
This is also the place where additives such as hydrated lime are gradually added if necessary to raise the PH. This very slight variation in feed input is the result of harvesting 1 cohort during a 4 week period, or 30 fish a week. My close-to 8-year old daughter, Megan, will manage the operation under the stewardship of her aunt while her mother, initially, anyway, incessantly complains. These fellows consume detritus, agitate the water, and are otherwise beneficial to the roots of the plants. In addition to having a pub in Thailand, now he's got a coffee plantation on the Bolaven Plateau in Laos where he intends to experiment with sustainable farming. I wish I could afford to go to the Virgin Islands and take part in one of your training programs, but I’ve got to do it the hard way.
The nutrients provided by the fish would normally be discharged and could contribute to pollution.


Ten of the 12 diffusion nozzles fitted to an air pump will go to air stones spaced equally along the bottom of the respective hydroponic tank.
The position of these divisions will be adjustable in accordance with the growth rate of any given cohort. Well, at less than 200g I doubt I could sell the extra tilapia, so I’ll gradually stock my river with them, keeping the feeding rate in the rearing tank as constant as possible. These will be nursed from seed for 2 weeks then embark on a 3 week journey from one end of a hydroponic tank to the other. The Styrofoam boards are lifted off the far end, the plants removed, and young plants are added at the front end, once a week. At a stocking density of 3 to 4 prawns per square meter, I estimate an annual harvest of roughly 75kg. Aquaponic systems require less water quality monitoring than individual recirculating systems for fish or hydroponic plant production. Rakocy puts it, “In a correctly designed and balanced aquaponic system, the ratio between fish and plants is based on the feeding rate ratio.
Each hydroponic tank can produce 80 robust heads of lettuce a week for a total weekly harvest of 240 heads. Aquaponics increases profit potential due to free nutrients for plants, lower water requirements, elimination of a separate bio-filter, less water quality monitoring and shared costs for  operation and infrastructure. The feeding rate ratio is the amount of feed fed to the fish daily per square meter of plant growing area. The 4th hydroponic tank will be devoted to a variety of other plants, namely cilantro, water convolvulus, and cabbage. This includes feeding them 3 times a day, keeping accurate records of consumption, routine emptying of solids from the clarifers (probably 3 times a day), and periodic rinsing of the orchard netting in the filter barrels. Some of the labor will pay for itself, such as applying the solids removed from the clarifiers to my coffee trees– higher yield. The goal of greenhouse production is to time the crops to when outdoor conditions are not favorable, so what I grow may vary with the seasons.



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