Ravnis

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  1. FoxWoodRunFarm liked a post in a topic by Ravnis in Disptching?   
    After cleaning fish in the 100s at a time camp, I tried the "brain spike" method after watching some videos.   If you're just doing a few , say 10 or less at a time,  it's probably a good way to do it.   The spine and thus spinal cord of tilapia is so close to top of the head, that a good quality cleaning knife cuts though it in about the same amount of time as the spike does anyway, so I quit trying to do it.    I've seen other members use clove oil.  I've used ice.  It slows down their movements, as well as slows down any spoilage while cleaning.  Downside is your fingers get very cold.
  2. Ravnis liked a post in a topic by ande in What have you harvested lately?   
    Hi 
    My first asparagus harvest, out of the hugelkultur bed 

     

    cheers
  3. Ravnis liked a post in a topic by vkn in Our experiments with IAVS..   
    It all starts with a seed..

    After you've dropped a seed in its place directly at the aquaponics sand culture ridges, you can go back and do other things. No more seed care needed. No moistening of the newly planted seeds with misters or watering cans. No fertigation efforts. It germinates and the cycle of life begins.  
    @ CSAF #1 demonstration cum commercial facility, near Oachira, Alappuzha.
  4. Mon liked a post in a topic by Ravnis in iAVs in Florida   
    I've posted these for aufin, maybe he can tell us more about them in a subsequent post
     
    A.    
     
    B.    
     
    C.    
     
    D.    
     
    E.     
     
    F.     
  5. Mon liked a post in a topic by Ravnis in FAQ - What is IAVS   
    A very good post of what is IAVS was submitted recently by Dr. McMurtry.  I felt it deserved it's own thread. 
     
    VKN - and anyone else who may benefit/care:
     
    I’m going to attempt to smooth your ruffled feathers.  I DO want very much for you - and everyone else - to succeed ‘beyond your wildest dreams’ (exceed expectations).  If I didn’t, then I wouldn’t still be typing, or otherwise infecting APN with my demonic ‘attitude’ - or ‘putting up with’ hostile lying trolls.
     
    I hesitate to craft the definitive ‘definition’ of iAVs at this time,  but I’ll ‘give a shot’ at listing what I consider to be the basic requirements:
     
    Water: fresh (non-saline), clear (non-turbid), non-polluted (no biological pathogens or ‘chemicals’, metals or nucleotides).  Basically, potable water.  Rain water is strongly advised for the vast majority of applications/locations. Its also free. (collect and store securely in advance of need).
     
    Sand: well-draining, no clay/slit, and chemically inert (does not raise or lower pH of water that comes into contact with it). We’ve been all over this topic in detail repeatedly.  “Sand†is a specific range of particle size, not a specific material/mineral composition.  Quartz (SiO2) is recommended if/where at all possible, but some other inert minerals and glasses may work well also.  Others certainly will not.  Operating beyond the scope of our recommendations is at the sole responsibility/risk of the operator(s).
     
    Furrows:  on the sand surface to distribute ‘water/waste’ evenly across surface and also to keep aerial plant material dry. Pristine sand furrows are stabilized by bacterial films, detritus and/or alga.  Attempt to maintain as much ridge area (mound between furrows) as wide as possible.  Furrows include both between all rows of plants and around the entire perimeter. 
     
    Flood/Drain:  Saturate filter substrate and then allow it to drain completely once every 2 hours (approx.) during daylight. Leave drained overnight.  In the tropics, first ‘cycle’ can begin somewhat pre-dawn and the last start at dusk (finish draining just after total darkness). Since drainage also occurs during the pumping interval, presuming sufficient drainage, one can pump 1/4 up to even one-half of a FT volume per cycle without reducing the FT volume by more than 10 to 15% at any given time.
     
    ‘Tank’ (fish containment), Its capacity, proportions, shape (especially bottom slope) and the pump type/location need combine (‘work together’) to effectively allow solids to settle, and collect in a region/zone that the pump will readily extract/remove when it comes on.
    Try to schedule irrigation volumes sufficient to exchange (turnover) the FT at least twice each day.  More might be ‘better’ - which can be accomplished several ways (not described here to avoid confusion) but not recommended to do so by shortening the on cycle interval significantly.
     
    Fish/Feed: Sufficient fish biomass and feed input consumed to satisfy fish and generate sufficient ‘waste’ to fertilize the number and species of plants being grown - not feed/stocked more than the filter/microbes can process continuously.  This will vary by fish species, age (size), density, DO, pH, Temp, of water, and feed composition/conversion.  Do not feed in the evening (allow for complete tank volume exchange between the last feeding of each day and dark).
    Sustainable fish load and feed rate also varies somewhat depending on type of plant species grown (e.g. leaf vs fruiting) and somewhat on the stage of development/maturity.  Too many fish eating too much feed and respiring too much TAN for the size of the biofilter bed in current use is not advised.  One could get away with this in the short-term but not over the medium- or long-term.
     
    pH;  iAVs is dominantly (90-95%) Horticulture - by mass and economic value in most markets).  Maximal fish production is NOT a goal nor advised. Vascular plants strongly ‘prefer’ (grow best) in range of pH 5.5 to 6.8 (extremes) and optimally 6.4 +/- 0.4 (variance range depends n specific species).  
    Believe it or not.  If one is satisfied with the results of one’s efforts, then that’s wonderful, really!.   If one wants to improve one’s circumstance further, then consider accepting best-intentioned advise.
     
    Soil microbial ecology.  Microbes evolved along with the plants they sustain/interact with, meaning they too benefit from pH in the ‘optimal’ range.
     
    In a ‘controlled environment e.g. greenhouse
     
    Pests and diseases:  Take every prevention precaution possible (too many to describe here).  A common vector is humans: limit and pre-sanitize all visitors and workers.  Monitor for any/all developing problems continuously and have appropriate remedy available immediately.  A gram of prevention yields many kilos of cure.  
     
    Use integrated pest management strategies extensively (employ beneficial insects, bacteria, and plants).  Use insecticidal soaps (Potassium salts of fatty acids) and plant-based extracts with care (minimize/eliminate contact with filter substrate)
     
    Maintain air temperatures and humidity levels appropriate to the plant species being grown. Shade, fogging, evaporative cooling can each be effective for cooling, either individually or in various combinations.   Always provide ample ventilation and continuous air movement within a greenhouse.  
     
    Above May Not be stated the best way possible:  Its just what keystrokes I activated this morning.  
    Any remaining gaps, errors or omissions are not intentional and regrettable.(and correctable).
     
    Questions to ask yourself - OR better yet, to share your responses to here:
     
    Is your water ‘clean’ or is it contaminated?  (e.g. nitrates, phosphates, pathogens, …)
    DO you have/use an inert, well-drained sand (sharp SiO2 preferred)
    DO you flood saturate and then leave drained on 2+/- cycle during the day?
    Are you maintaining ‘system’ (water) pH in the range preferred by plants for optimal growth?  Above pH 7.0 is NOT recommended.
    Do you have a ‘balanced’ fish load and sustainable feed input rate?
    Are you growing nutrient demanding crops (solely lettuce is not advised)?
     
    If you answered Yes to ALL of the above questions, then congratulations … you’re amazing and quite unique. 
    I say that in spite of the fact that I will always insist that AP is a disease.  Some diseases are curable, others are not.
     
     
    You’re Welcome.
     
    ============
     
    PS: Yes, I am fully aware that focusing on plant production (minimizing fish to plant ‘ratios’) is viewed as blasphemy by many, if not most, aqua-holics.  This is not a concern I have.  No one is attempting to prevent anyone from doing precisely whatever they feel like, be that rational or otherwise.  Don’t freak out or invent fallacies.
     
    I am describing what iAVs was intended to do, aka how it ‘works best’ (to date).  What anyone who is NOT literally doing/using iAVs “feels†about claims and goals thereof is irrelevant to me.  Do it or don’t.  Your choice.  Your life. .......  BTW:  Not seeing is not believing ... and vice-versa
     
    If you do undertake iAVs, then please accept our advice in the spirit intended.  My/our intention is for you to realize the best outcome possible, with the greatest cost:benefit possible.  There is and never has been anything (positive) ’in this’ for me.  iAVs has always been exclusively about you (others).   That is all.  
     
    No fee, No exchange, No refund. No apology.
  6. emma liked a post in a topic by Ravnis in Overwintering tilapia with minimal heating   
    The topic of solar water heater has arisen again.  This site is a treasure trove of ideas.
     
    <a data-ipb="nomediaparse" data-cke-saved-href="http://www.builditsolar.com/Experimental/PEXCollector/Construction.htm" href="http://www.builditsolar.com/Experimental/PEXCollector/Construction.htm'>http://www.builditsolar.com/Experimental/PEXCollector/Construction.htm" "="">http://www.builditsolar.com/Experimental/PEXCollector/Construction.htm'>http://www.builditsolar.com/Experimental/PEXCollector/Construction.htm'
     
    The solar heater I used in this thread was a 16 foot long version. I got around 4C or 8F degree rise with it.   I used 1/2" pex, but it constricted flow , so if I was to do it again I would consider 3/4" instead.
  7. Ravnis liked a post in a topic by WillsC in Thoughts on heating a greenhouse   
    It is a bit awkward.  The stove comes with a long handled ash scoop, in fact mine came with 3 of them:)   They were wrapped together and I assume the employee doing the packing did not notice??  So picture a metal dust pan welded to the shaft of a metal golf club.  It works and there is not that much ash.  In the aprox 30 days I burned it I believe I cleaned it out 3 - 4 times, took a couple minutes each time.  I might have got a 5 gallon bucket of ash total from all the clean outs, wasn't much.  Not like a normal wood stove where you are burning a lot of volume of wood.  Each fill is like 3-4 pieces of 5" wide 5" thick and 15" long pieces of wood so low volume so low ash. 
  8. ande liked a post in a topic by Ravnis in US Government Shutdown   
    Heres my 0.02,
     
    I worked in insurance for a while and left it because it was not the kind of work I wanted to do.  Lying for living just isn't appealing to me.
     
    One of the things I learned was the secret govenment funds that bail out insurance companies during extreme losses, only insiders know about the fund and it not on the official books. There are backroom deals going on frequently in our government. 
     
    For decades, the cost of insurance has skyrocketed and companies  count that as part of the pay given to employees. Before the afordable care act, it was equivalent to a 50% tax on income for the lowest wage earners. The employers had to have complete enrollment, so employees don't have the option to opt out.   For middle income workers with higher wages, this percentage dropped to 25%. The poor basiclaly subsidize the wealthy by paying more of their income to insurance.   
     
    Health care costs too are part of the equation, they go up  hand in hand with insurance cost. Big pharma  charges 10 to 20 times in the US what it charges in other countries. How does it get away with it? One reason is insurance. People don't worry about the cost as long as they can afford the copay.   I forget the source, it's not mine, but health care is the one thing that free markets will not control, because unlike buying a car or a tv and waiting for the price to fall, with healthcare you can't wait if you need it.  
     
    That the insurance costs is going up due to covering the uninsured now  is ludicrous.  They are already paying out, through higher fees, the cost of taking care of the uninsured as hospitals have the EMTALA law that require them to treat anyone that comes within 150 ft of the hospital.  The insurance companies are railing against the cap of a maximum of 20 % profits, due to a requirement to refund the excess.  .  This is a very, very good profit margin for a business, as fortune 500 companies celebrate 10%.   The insurance companies dropping out, are not dropping out of all of ACA, just select markets. They have figured out how to game the system would be my guess and just be in select markets.
     
    There are people that went hungry and were only able to get food from charities due to the shutdown.  If anything is bound to trigger a civil war in the US.... I'm betting it's hunger.,
  9. Ravnis liked a post in a topic by WillsC in Thoughts on heating a greenhouse   
    Early,
     
    I apologize for invading your thread but Andre wanted some pics of the setup.
     
    The heater inside the tote.
     

    The surround I mentioned, before the gap was filled with perlite.  Btw i filled it with loose perlite, not perlite cement.  From memory I think it took 16 cf.   

    Looking down in the burn chamber.  The air enters between the side wall and that metal plate and the plate extends to about an inch from the bottom so air is forced under the fire, though there is no bottom grate. 

  10. Cecil liked a post in a topic by Ravnis in Poor Donald so uninformed   
    You can't expect the donald to know what comes out of a "Shole" country now can you    If he could only be informed.
  11. Ravnis liked a post in a topic by Cecil in U.S. Steel Tax.   
    How many of you knew the last time we had a trade war on a global basis is it was followed by the Great Depression? Experts say it my not have been the entire reason for the GD but it sure contributed to it. 
    Look up the Smoot Hawley Act if you want to read more. 
     
  12. ande liked a post in a topic by Ravnis in U.S. Steel Tax.   
    Hey Bigdaddy,
    Our economy has suffered almost every time a "businessman" has become president.  The job of promoting welfare of a country is almost a complete opposite of the mindset of running a business.  
    I found this article interesting.
    Businessman presidents.
  13. mhaigh liked a post in a topic by Ravnis in Ravnis Indoor IAVS   
    Working just fine. I've had a problem with my furrows not staying formed, but I think I have too much force of water from my pump and need to redo the output so it doesn't erode it.   It states astm c33 in its listing and plants grow well in it.  It's easy to get and works.
     
      I did not do a bucket test. I had lost too much sand from replanting the short term crops and needed something fast.  After reading  Mark's post on ASTM C33 spec that confirmed what I had suspected , I just went with it.  I really think some of us have gotten way too hung up on "the right sand" as long as it's inert and "sharp" sand.   I've used the original less than perfect sand (read more fine than specified) and was satisfied with growth and Just had to adjust pump time due to slower drainage.
    I have to say again.  I really like your new forum Gary.  Though I haven't had as much time to read through it as I would like. 
  14. Ravnis liked a post in a topic by bigdaddy in U.S. Steel Tax.   
    That reminds me of the joke.
    A plane was about to crash there were 4 passengers on board but only 3 parachutes.
    The first passenger gets up and says 'I'm Steph Curry, the best NBA basketball player...The Warriors and my millions of fans need me I can't afford to die."....
    He took the first pack and left the plane...
    The next passenger gets up and says "I'm Donald Trump, the newly elected U.S. President and I'm the smartest president in American history, my people don't want me to die"...He took the 2nd pack and jumped out the plane...
    The 3rd passenger, the Pope said to the 4th passenger, a 10 year old schoolboy" My son, I am old and don't have many years left, you have many mores years ahead of you, so I will sacrifice my life and let you have the last parachute" The little boy said "That's OK your Holiness...There's a parachute for you....America's smartest president just took my school bag"
    Ande, You are onto the exact same stuff I'm on about
    Hey Rav, interesting list...I'm not so sure Donald Trump is particularly successful either, considering the silver spoon he had in his mouth growing up and upon his inheritance.
    Cheers..
  15. ande liked a post in a topic by Ravnis in U.S. Steel Tax.   
    Hey Bigdaddy,
    Our economy has suffered almost every time a "businessman" has become president.  The job of promoting welfare of a country is almost a complete opposite of the mindset of running a business.  
    I found this article interesting.
    Businessman presidents.
  16. Ravnis liked a post in a topic by vkn in Our experiments with IAVS..   
    Weekend fun!  First fish catch by my kids using spinning wheel fishing kit..

    Boys A1 and A2 working together caught 10 fish for the lunch in 30 minutes from the aquaponics fish culture tanks.. A3 had no luck at this time and wants to go to a nearby dam or river for fishing this vacation but was curious and had good fun!

    Kids love aquaponics maybe because they look at fish as their pets. Fish is low in fat, high in protein and rich in omega 3 fatty acids. Once they are taught how to fishing, hooking them to eating fish regularly becomes easier. That's what I think. Your thoughts!
  17. ande liked a post in a topic by Ravnis in U.S. Steel Tax.   
    Hey Bigdaddy,
    Our economy has suffered almost every time a "businessman" has become president.  The job of promoting welfare of a country is almost a complete opposite of the mindset of running a business.  
    I found this article interesting.
    Businessman presidents.
  18. Cecil liked a post in a topic by Ravnis in US Lifeguards To Carry Sharks, To Protect Beachgoers From Future Shark Attacks   
    The only way the gubmint is getting mah shark is if they pry it from my cold, dead hands!!!   
  19. Ravnis liked a post in a topic by Cecil in US Lifeguards To Carry Sharks, To Protect Beachgoers From Future Shark Attacks   
    http://www.theshovel.com.au/2018/02/25/us-lifeguards-to-carry-sharks/
     
     
  20. Ravnis liked a post in a topic by Cecil in US Government Shutdown   
  21. Ravnis liked a post in a topic by phri in Easier than a Bell siphon   
    If you like flood and drain, a timer on the pump, and a double overflow (restricted bottom and unrestricted top overflow) will work more reliable than a bell syphon.
  22. Ravnis liked a post in a topic by bigdaddy in Uh oh!   
    Hi Cecil,
    I've been a big fan Elon Musk and Tesla for quite a while now...They make lovely cars and off course a heap of other stuff...I like the way he presents his products, different in many ways to the way Steve Jobs used to present his products...maybe not as polished but very interesting in my book....
    I did watch the Falcon Heavy Full launch live from my computer screen  and for those who are interested...
    I think that's what you were getting at Cecil?
    Cheers.
  23. Ravnis liked a post in a topic by ande in Uh oh!   
  24. Ravnis liked a post in a topic by Cecil in Uh oh!   
  25. Ravnis liked a post in a topic by ande in Poor Donald so uninformed   
    Hi

    I would call the D. uninformed, rather than misinformed.
    cheers