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About GaryD

  • Rank
    Senior Member

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  • Biography
    I'm a micro-farmer....and the author of The Urban Aquaponics Manual
  • Interests
    Microponics, woodcraft

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  • Location
    Macleay Island, QLD
  1. Hi Kellen...any expressions of interest in the hatchery?
  2. Hi Kellen, A big step for you and Sarah. Best of luck with the sale. Gary
  3. Hello Murray, I also like the idea of combining re-purposed swimming pools with wicking beds...while also using them to grow fish. Swimming pools excite me for the amount of rainwater that they can hold as much as anything else. Gary
  4. Recently, I watched a segment on a rural affairs program where one of the reporters went through the list of things that are being marketed as 'milk' including soy, almond, hemp and rice. It seems that the thing that the thing that they all have in common (aside from the fact that they have no connection with cows) is that they invariably contain little of the source product. For example, one brand of almond milk had as little as 2.5% almonds in it.
  5. Hi, I've been a bit thin on the ground lately but, happily, it has nothing to do with my health. It's almost three years since I completed my cancer treatment and my medical specialists continue to make positive noises. I've been travelling (three weeks each to Vietnam and South Australia) and working hard to integrate all of my interests and websites. I'm still working on iAVs and waste transformation farming. Over the past ten years, I made many friends on this forum. I wish you all well...and I'd love to hear from you again. Gary
  6. You seem to be following a path that is typical for many of your countrymen. In the recent past, I've communicated with a number of Indian people who work in the UAE and who are looking to do iAVs back in India. Good luck with your endeavours.
  7. Hi Kellen, Wow!....300lbs is a lot of goat meat on the hoof. When I think of meat goat breeds, the Boer usually comes to mind. How does the Kiko compare with the Boer?
  8. Sorry, Nsidibe...I've been busy elsewhere for the past months so I missed your post. During a recent trip to Vietnam, I supervised the build of a small IBC Sandponics system and that gave me firsthand experience of the difficulties associated with sourcing materials and equipment in some places. The availability of suitable sand has also been flagged as an issue by increasing numbers of people so I've created a sand test rig in an endeavour to determine if sand is suitable without the need to know its fractionation range. Gary
  9. Sand is the most cost effective mechanical and biological filtration media of all...and there'sa growing body of evidence (aside from Dr Mark R McMutry's research) that supports its efficacy as a growing medium. In fact, it seems that the only criticism of sand used in the integrated production of fish and plants comes from people who have never tried it. The sand is the only solids removal process that is required. The Integrated Aqua-Vegeculture System (iAVs), in its most basic form, consists of a fish tank and a sand biofilter. The water is pumped from the fish tank (which is buried in the ground) up to the sand growbed. It percolates down through the sand and exits the sand bed...draining straigth back into the fish tank. If the sand is silt and clay free, there will be no need to wash the sand. The fish solids remain in the furrows where they become part of the soil microbiology that underpins iAVs. I made the comment with reference to coarse gravel, clay pebbles, pumice and scoria....where separate mechanical filtration is essential. With iAVs, there is no need to remove the solids....they become part of the detritus layer and are mineralised in the furrows of the sand biofilter.
  10. Keep it up, Toga. I'm learning more about lighting with every post that you make. I would really like to build a grow room...with the ability to control every aspect of plant production...but the power (and heat) associated with HID and MH lights has been an issue...and I've found some of the claims around LED lights (not to mention the cost) a bit intimidating. What's your view of a hybrid set up...where the grow room functions as a greenhouse during the day and, at night, it gets closed up and the lights come on for a period? Feel free to take this discussion to its own topic if you want?
  11. What is your Malaysian aquaponics dream, VKN?
  12. Whoo Hoo! could be on your way to becoming a chicken wrangler, Brian
  13. The nitrification situation was never quite as simple (in terms of the bacterial composition) as we've presented it in aquaponics. There were always other organisms at play. For example, Dr Tim Hovanec determined (years ago) that nitrospira were the dominant species responsible for the conversion of nitrite to nitrate in freshwater systems....but the popular (non-scientific) consensus is that nitrobacter played that role. In any case, given that your system appears to be quite robust, I would be unconcerned about the possibility of toppling nitrification so long as the changes that you make are gradual and consistent. The role of plants certainly impacts the pH in any system but Mark McMurtry determined that, so long as he kept plants in the system, it became self-regulating around pH 6.4. He discoved that, if he removed the plants, the pH fell through the floor. In other systems, calcium (or other elements) is added to the system to offset the acidification that is occurring. This is obviously impacted by the fish biomass load (and the subsequent feeding rates) but I believe that any conventional aquaponics system will tend toward acidification over time. Of course, this will be offset by the use of media containing carbonates...or make up water with a higher pH. In my view, this is just as all aquaponics systems should be. The ability to isolate the fish from the plants is essential in the event of disease or infestation but it has other advantages, too...not the least of which is the ability to supplement nutrients from other sources. European researchers first looked at dual loop (decoupled) systems back in 2009 (I think) with a view to more effective nutrient utilisation. If I recall correctly, they concluded that decoupling was probably impractical for backyard systems.
  14. In my view, the best possible outcome would be for Trump to get ousted and to roll the dice again. Hopefully, the electorate would (having had the wits scared out of it) settle down to consider the benefits of social democracy....capitalism for the people if you wish. What the US (and the world) needs is a new economic and social order that is almost diametrically opposed to the one we have currently. It's time to care for people and the planet. And with that, it's time to go and fuel up the pigs and make sure the runway is clear.