Aquaponics & Dissolved Oxygen: The Basics
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- เผยแพร่เมื่อ 4 พ.ย. 2012
- If you're an aquaponic producer, or if you're thinking about getting into aquaponics, you'll need to consider dissolved oxygen levels in your system. In this video, Nate Storey, Co-Found of Bright Agrotech, gives a brief overview to help our aquaponic TH-cam followers be successful with dissolved oxygen and aquaponic production.
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I'm glad we can help. Thanks for watching. Yeah, we're on the front end of Zucchini season again here in Laramie. Time to get inventive. . . . Thanks for the tip on zucchini chips. I'll try them out! :)
Hey Nate! Thanks for all your videos. I've learned a lot from you! I found the answer to the question I had in one of your other videos. But thought I'd write to let you know there was another person out there watching and learning from your videos. And that I'm gratefull for your help. Hope you end up happy, healthy, and rich brother!!!!
Some guy named Matt from CA...
Glad to hear this has helped you out!
Venturi fittings are really nice, Enrique. They're just one of those things that in some systems they can be kind of irrelevant. In systems with an oversized pump (pumping more water than you technically need), a venturi pump can be a great way to facilitate gas exchange and introduce more DO to your system (especially if you don't want to invest in an air pump). That said. Venturi fittings can tend to be redundant. It really depends on your situation and your system goals.
It can! We accomplish most of our aeration with circulation, but airstones can help raise DO, especially in systems with low circulation rates
Great information to know and nicely presented. Thank you for sharing.
Just pointed out my problem with my Pond. Thank you so much!!
Aquaponics systems with reasonable stocking densities & good gas exchange already, don't really need additional help raising DO levels. We've used them in the past. They're pretty neat and they're pretty cheap too. So in some scenarios they can save you money on an air pump.
Discovering this really helped in water propogating plants being more successful
Just what I needed, the science behind aquaponics. :) just subscribed.
Water is more dense at higher pressure, but it doesn't really matter in these applications because it will always be fairly shallow. What really matters is the water's exposure to atmospheric oxygen. Water density can play a role, but most often has to do with solutes more than pressure since the oxygen has to diffuse from the atmosphere.
I'm a backyard aquaponics hobbyist and I really appreciate these videos! When it comes to internet advice I pretty much only trust you guys! Nate's the man!
Which is why I am curious about your thoughts on electrolysis for aeration. Similar to the O2grow product. Using electricity to split water molecules and make HHO gas. Apparently, this is a great way to dissolve oxygen into water. But are there any side effects? I'm curious if the reaction will also create salts or chlorine over time? Perhaps the plates will also break down with time and add metals to the water? I'd love to know your thoughts on the topic! Thanks
Thank you very much for the very useful video ! Great job!
This is very helpful 👍 thanks for sharing 👍 more powers to your channel ❤️
Can you put a overview in the description? I still don't get DO, but this did help.
Smaller bubbles means more ability of O2 absorption in solution. Look for as small of bubbles produced by stone as possible. Think about it like this, more surface area the smaller the bubbles have, more absorption into solution. It's like a boulder to sand weight ratio, the boulder may be bigger and heavier in a single mass. However sand at the same weight ratio has million's of times surface ratio as the single boulder.
Or you can reverse it, and trickle water through a trickle filter or mist water through the air back into the main body of water and get just as much O2 exchange from the surface area :D
So how do you physically measure DO? If I (being a bit of an experimenter) try various methods of oxygenation, what methods do I use to ensure consistency in my measurements? Also: your videos are fantastic, thank you VERY much. Next time I'm in Laramie, can I get a tour?
Hi love your videos. I have an Aquaponic system. I have been growing plants this way for 3 years in a small commercial way. I have my fish and plants in the same pool. I float my plants on top of the water with the fish swimming underneath. I have a separate bio-filter. This system has it's own unique problems. Getting the nutrient levels right is a challenge. I am in Queensland Australia.
Hi REGINA LUKOSZEK - There are always unique challenges with every AP system. If you haven't downloaded our nutrient deficiency key (shop.brightagrotech.com/nutrient-deficiency-key/) that may help some. Otherwise, hang in there and stay tuned to our blog for more info!
You can marinate them with almost anything. Vinegar and sea salt. Paprika and olive oil. Coconut aminos and curry. Blended herbs with soaked cashews. You name it, its good on zucchini chips. I recommend dehydrating at first at 140 degrees F, then after one hour, turning it down to 105-115 degrees F (adjust for humidity) to maintain the best flavor and nutrition. :)
Is there a correlation between DO and ph in water like there is for temperature and DO?
A DO meter is probably your best bet, unless you're feeling overly ambitious and want to calculate it backwards. If you REALLY want to know how to do that, you can shoot us an email. Next time you're in Laramie, let us know! You're more than welcome to come by for a tour.
will using an airpump/airstone help in creating more DO in your tank?
I am planning to start a fish farm buy before that i want to do an experimental setup in water tank containing water of 200 litres. So i am not having a do teating device. So if i maintain the ph value and provide aeration with 1500 litre/hr pump. What do i need to check. Is it enough. And what fish density should i maintain for sich an experimental setup
Very informative videos 👌👌👌👌👌
Have you heard of aquarium internal water pumps with a venturi attachment. They say it suppose to increase Dissolved Oxygen, What's your opinion
Thank you Nate for all your great info. My wife and I are in the process of creating an aquaponics system. We have a question on "DO", when the water temperature is high, would it help to divert the circulating water down into the ground into a coil to pull the cooler temperature out of the ground in order to cool down the system water; thereby not impacting the "DO"? Would this really help? Thanks
Cooling the water will help, since colder water holds more oxygen. So long as it's in the right temperature range for your fish, cooler is better when it comes to O2.
Oxygen solubility decreases with increasing temperature. Also, bacteria and marine organisms often consume more oxygen with increasing temperature. Because the solubility is lower, diffusion rates are, of course, lower as well.
Does HP affects DO level ? Acidic is good for DO right ? since its O 2minus. Can u include the referencing recommended air volume sizing over a number of fish ? or Plants
Plants need fairly high oxygen levels as well. Saturation is ideal. The roots need to remain aerobic. If they're anaerobic, they'll die very quickly (for most plants). If you're cycling your water fast enough and your fish are still alive, you'll be fine!
I'm loving your videos. I'm going to start doing a system shortly, so I'm studying up. In your Top 10 Mistakes Made By Aquaponic Growers, I laughed about the zucchini thing. We got a lot of zucchinis from our CSA membership. More than we wanted to cook or put in salads. So we marinated slices and put them in the dehydrator and made delicious zucchini chips. After starting that, we had no problem eating as many zucchini as could be thrown at us. Thanks for the great ebook. :)
Hi, hope you could still notice this comment. I have a question, if I use venturi with a 35w pump 1400L/H would that be enough to supply oxygen to 8 meters with 2meters width grow bed?? Please I really need a answer.
Hello there nice video about DO . I have one question ....Which method is accurate for measuring DO? Winkler's Method or by using DO measurement instruments?
Hey there, we just use standard DO meters.
Thank you for your reply.
My question is, how about they shrimp? As they grow bigger, they need less of DO?
are there any monitoring tools available for aeration devices that would help keep dissolved oxygen at safe levels for the fish?
Hi Adam, Yes. You can use a DO (dissolved oxygen) meter to make sure your levels are within range. It depends on what type of fish you're raising but generally a minimum of 5ppm is what you want. Hope this helps!
Not sure if this is a stupid question but is it possible to over oxygenate your water? If so, is that bad and why?
I find alot of information about DO required to keep fish alive, but no information about the oxigen requirements of the plants.
I have a floating raft system that does not have a bell siphon system. In My system water circulates from the fish tank to a swirell Filter, 2 tanks with gravell (biofilter) plus 1 screen filter, after water goes into a 12 inch deep grow bed and from there is return to the fish tank. HOW DO I DETERMINE HOW MUCH OXIGEN IS NEEDED to grow healthy plants?
When the water get warmer, there is less dissolved oxygen? Right?
Where do you guys get fingerlings, I am having a hard time finding some, I would like tilapia, trout or any other fish that's edible.
Call your local hatcheries or connect with other aquaponics folks online. Anyone growing tilapia will always have a few extra!
I have a question .right now I am.currently doing calculations and.designs for a.shrimp farm.where I live and I am.stuck at calculating the aeration requirements for.the tank. I am looking all over but I am.not finding the standard oxygen transfer efficiency factor and.the field transfer efficiency . can you guide me what figures to use or how to.derive these factors or where to look for.these factors. my tank is 24feet diameter by 52 inches deep. thank you.it's a biofloc system as well
Hey +Mansoor Hosein - Yeah, check out the fao.org site- they have tons of relevant information. I really can’t help with shrimp!
GRATITUDE 💥🐟🐟💥
I’ve heard a lot about how some growers mainly with perch maintain a low but constant salt level in their water is that something to do with the type of fish or is it just a wife’s tale?
Correct. Warmer water can hold less dissolved oxygen than cooler water.
So this is actually in reference to a pond i'm attempting to restore into a self-sustaining ecosystem. I just added a homeade fountain to it, will that help create dissolved oxygen? Also what are the physics of the oxygen molecules in water? do they stay near the point of water disruption or do they disperse throughout it along the waves thats created from the disruption. Does it go down to lower levels of the water or stay near the top for it to escape back into the air?
Its a lot but i would appreciate a response :)
Hey dgorrell7 1. Yes, a fountain will help with DO. 2. DO diffuses through the water from areas of high DO to areas of low DO. So it will diffuse, but it will also be consumed very quickly, so the question is whether your introduction and diffusion rates are faster than your consumption rates by microbes, fish, plants, etc. Hope that makes sense!
It makes perfect sense! i love the videos, some go a little to in debt for me but for the most part (thanks to physics) i understand a lot of it. Also, how does layering happen? when you say that it diffuses from areas of high DO to areas of low DO, shouldn't it go deeper into the pond? or is the water too warm and it escapes before it diffuses because of the molecules of water moving more rapidly? Thanks, i have a ton of questions.
Yes, it should go deeper in the pond, but consumption, different water temperatures, humidity, sunlight, etc. can all interfere with that process, dgorrell7.
Say i introduce crayfish, i'm assuming they're not much of a top feeder/algae eater but are they are a good first thing to introduce back into it? Because initially i was thinking about introducing carp into the pond to clean out the bottom or at least some of the dead matter (probably piled up). Then i didn't want the carp to spawn because that would be a huge nuisance. So i'm considering crayfish now. if you disagree could you forward your suggestion for a first species introduction? the pond has been practically lifeless except for ducks which don't do much for about 10 years or longer. and thats ten years of algae die offs. and up until recently with the fountain no sort of aeration either.
dgorrell7 - If it decomposing organic matter from plants, animals, duck crap, etc., they make pond supplements that are composed of bacteria that will digest all of these things on the pond bottom without removing them. You just need to keep the pond aerated.
How much size of aerator need for 6000liters of water? Fish density is 25kg/1000liter
what is a normal range on a meter for D.O.???? can you let us in on normal levels of D.O???
Normal range depends entirely on temperature, altitude and stocking density. There are tons of graphs out there that will show you what saturation is for your altitude and temperature. Google is a huge help with this!
Hi, I live at 7,000 feet in Flagstaff AZ. What problems can i expect with having enough DO? What would be some simple solutions. I was thinking an air stone but dont want to run the extra electricity unless its necessary. I am still planning but want to avoid a high altitude mistake.?
Keep your stocking densities lower and your water cooler and you should be fine!
matt smith
Having trouble finding information concerning carbon dioxide levels in aquaponics. I realize the direct relationship between CO2, Ph and dissolved oxygen,but is there a red flag concentration of CO2?
Thanks for your comment. Carbon dioxide levels should not exceed 20 ppm. At higher levels, the fish become sluggish and cannot absorb enough oxygen through their gills. In systems with diffused aeration, carbon dioxide buildup is not a problem because it is vented off to the atmosphere through agitation of the water.
Is there a simple way to measure the DO levels?
Roger Nevez There are meteors that measure the dissolved oxygen, if you do a search for them on amazon you will find a thousand results
+justin brown
> "There are meteors that measure the dissolved oxygen [...]"
Meters ...
Roger Nevez yes, it is called autocorrect. Meters.
Woah, I had no idea small fish need more oxygen 😳 I breed tropical fish and wondered why my juvenile grow out tanks always needed more air stones, duh, they're obviously in growth stage / oxygen hungry little teenagers that have metabolisms in hyperdrive 🐠 Fish have such a rough time when they're small haha, they really need to get big enough to not be eaten by literally every other animal around them including their parents some times hahaa
Glad you learned some things from our video Arty, and yes just like teen humans, teen fish can be demanding!
Hello there can I have an e-mail of you sir so i can directly ask you regarding aquaponics if you dont mind
Can you add too much DO in your system?
Can you have too much DO?
There's no such thing as Dissolved Oxygen. Oxygen is hydrophobic and water is not H2O!
I have a question .right now I am.currently doing calculations and.designs for aquaponic system and I will use the tilapia as a nutrient resourc . but I am.stuck at calculating the aeration for.the tank.I mean the air pump size and my fish tank size 20000liter, and the density is 500 kg can you explain for my how to calculate that to choose the correct air pump size
Hmm. It depends on the temperature you’re going to be running your water at, the turbulence you want to introduce and the fish and feeding rates you’re working with. That being said a general good rule of thumb is the volume x1 or volume x2/hr for air- so you’d want between 20k and 40k L/hr