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About mattyoga

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  • Location
    Perth, Australia

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  • Interests
    AP, Fishing, yoga
  1. Looks a very well put together system? Is it decoupled? The reason I ask is it looks like you have copper fittings on the plant side and copper/other metallic fittings can be a toxicity issue if in the fish loop. As to integrating myco culture in- I'm still experimenting without success to date. I have mycelial filters though have not had any fruiting from king stropharia. VKN is trialing some in his sand beds.
  2. Will be interesting to see how they go - King Stropharia would be really good I think for your climate. I think buttons are generally secondary decomposers so not sure how they will go, though will await the results keenly.
  3. I'm trialing king stropharia at present.
  4. which species vkn? I'm wondering if they will have eneough carbon available to them? Though this suggests they can handle C:N of 5:2 so maybe the CN ratio in fish poop is fine.
  5. Silver Perch Skrettings Nova FF
  6. You'll need a source of carbon for them, so I would imagine if you added enough Organic Matter to the sand you could grow them. I'm just trialing a king stropharia (KS) woochip grey water filter at present, which if successfully inoculated will move a section to my RAS system. KS thrive in a bacterial rich environment and have been shown to improve some veg species production in convectional beds (see mycelium running by Paul Stamets).
  7. No, still not found a cheap suitably grain sized source. The gin gin quartz sample i tested was too fine. I think pool filter sand may be my best bet at this point. Though about to go out bush for 3 months so its on hold.
  8. I'm surprised at the feed rate for large fish - though never grown tilapia, and never will unless I emigrate! I generally feed my fish 1% of body weight at 300g and they still come out full of fat.
  9. Tis a pity, and seeing some of the decisions the WA EPA makes on projects involving big business (EPA - Every Project Approved!), even more annoying!
  10. Thats good to know Ravnis about sand bed loading and consequential benefits to other systems. Got any details on your solar heating setup? so as not to derail VKNs rather inspiring post, a link would be better if you have posted elsewhere.
  11. thats a great amount of jades - such a pity we can't get them sent over here to WA
  12. Nope, though my thermodynamics theory suggests heating water is better - more effective heat transfer, heating what I want to get hot, I'm not too concerned about humidity - in fact I'm taking it as a bonus as it will help to grow mushrooms in there. That said if I wanted to cool - I'd cool the air with a through wall air con like you have, though don't have space in my RAS setup to fit one. That said we can pump trout out to plate size in 6 months over winter here in perth so not too much of an issue. I plan to run 18 months barra (get them to 1.5 to 2kg, then 6 months of trout. or I could do 6 months of barra and get them to plate size, though they fillet nicely so like the bigger size.
  13. sold as drainage sand for horse yards!
  14. I took rough figures from here: Table 4, exp 1, 1:2.25 ratio, harvest density is 16.73 kg/m3, feed rate at harvest was 1.81 %. So rounded DOWN conservatively to 15kg/m3 and 1%. Taking a different approach feed rate at harvest was 288g/day, feed rate at stocking was 97g/day, giving an average of 192g/day if linear growth and reduction feed rate% assumed. That would give a slightly higher g/m2/day figure. I'm an engineer by profession, so spend my life filling holes in data to get things happening - I'm taking the same approach here to get rough figures. What they are telling me is that I may have issues trying to load 2m2 with 300g per day !!!
  15. The 1% and 15kg/m3 figures were taken from IAVS trial data. I'm well aware that the parameters can change, though they are only necessary to derive the feed rate. If we speak in straight feed rates (at an assumed protein content level) then stocking and % feed rate are of no concern. I fully understand what the commentators are saying and I believe it a useful tool in both assessing efficiency and ensuring systems are balanced. It is interesting that the inefficient UVI model states 60g/m2/ day while others (Earthan, Lennard, and even data inferrred from the IAVS (see above) indicate between 10 and 20g/m2/day. This figure will change to some degree depending on plants grown, though it is still handy. For example the standard BYAP system blurb says 2 x 500L beds can support 50 fish. BUT if you are feeding 50 x 300g fish 1% per day you are feeding 150g per day which comes out to be around 30g/m2/day. My experience with that feed rate is that you end up with excess nitrates and all the issues they cause (fruiting plants dont fruit, lettuce is bitter, etc). Anyhow, Yes if I was to start from scratch and I had evidence that IAVS outperformed other beds (still can't find a sand supply so a long way off proving that for myself!!!) I would just use IAVS. BUT I have significant infrastructure already built, with very insignificant levels of free time now I have small children, so a hydrid system is a way of 'evolving' without too much effort using the limited resources I have (time!). Another issue is that I want to be able to grow Barramundi, which in Perth means heating water. I have a RAS system that is heavily insulated such that I can maintain 24 deg water temps through winter with only a 200W heater on 50% of the time (ultimately I hope to heat via solar hot water). If I was to go over to IAVS I would lose all that heat in the water when I pass the water through the sand beds. so perhaps I could have a RAS with radial flow filter that feeds an IAVS sump the solids daily. Hence my interest in loading rates - could I get away with converting one BYAP 500L GB to sand and pumps the solids to that.