A portion of this video is
brought to you by Incogni. To live, people need food to eat and water to
drink. That’s a simple fact. But with growing water scarcity around the world and an ever
increasing population, we have to find better ways to produce the food we all need to survive.
The solution could lie in one of several promising farming techniques like hydroponics, vertical
farming, or aquaponics. That last one has technically been around since ancient times, but
has been gaining a lot of interest recently. How is this old technique getting revived? Can nextgen
tech really bolster age old symbioses, and build a mini ecosystem that creates more food with less
water? Could aquaponics be the future of farming? I’m Matt Ferrell … welcome to Undecided. In past videos I’ve talked about vertical farming,
as well as agrivoltaics, and how they’re changing how we should look at farming in general. Using
technology in combination with different farming techniques can unlock a lot of potential, but
why should any of us be interested in that? Well, by 2050 the United Nations predicts
there will be 9.8 billion of us on this pale blue dot. All those people need healthy food
and clean water, but our current farming and agricultural techniques just aren’t up to the
challenge. In fact in some cases they’re making it worse. Agriculture has been the single
biggest driver for wilderness destruction. As a species we’ve cleared over a third of the
world’s forests and two thirds of its grasslands just for farming. As we’ve destroyed these
carbon-sequestering biomes we’ve released more greenhouse gasses into the atmosphere and seen
a sharp decline in our planet’s biodiversity. On top of that arable land is shrinking.
Every year, an area about half the size of Britain turns to desert, and by 2050
the forces of climate change and pollution will have cost us 50% of all currently arable
land. And while that’s happening we’re going to need to increase food production by 70% to meet
the world’s appetite in 2050. Not a great combo. Then there’s the common practice of growing
only one crop species in a field at a time, which is known as monoculture.
This makes it easier on farmers, but monocultures deplete the soil of nutrients
and moisture, causing irreversible soil erosion, and necessitating more water and fertilizer.
Meanwhile monoculture’s lack of diversity has been shown to harm pollinators like bees, which isn’t
helped by the increased reliance on pesticides. To make matters worse, agriculture uses
an astonishing 70% of our drinking water in most areas. This is simply untenable when
you consider the now regular droughts across the world. For example, the United States
Southwest is in the middle of the worst megadrought in 1,200 years. Last year
Europe’s drought revealed long hidden “hunger stones.” These hydrological markers
were left by humans hundreds of years ago, warning that if the river was low enough for you
to read them, then famine was sure to follow. That’s all grim stuff, but aquaponics
might just be able to help. Before I get to that, I’d like to thank Incogni
for sponsoring this portion of today's video. I’ve mentioned this before, but I signed up
for a newsletter from a small online retailer and after I did I saw a major increase in the
number of promotional emails I was receiving from companies I’ve never heard of. And that’s
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couldn’t be easier. I’ve been letting Incogi stay on top of this for me for quite a while now and
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control around who has access to your personal information, give Icogni a try. The first 100
people to use code UNDECIDED at the link below will get 60% off of Incogni. Thanks to Incogni
and to all of you for supporting the channel. Now back to how aquaponics may be
able to help the future of farming. Aquaponics is a portmanteau of
“aquaculture” (AKA farming fish) and “hydroponics” (AKA growing plants in
water), and it combines some of the best features of both to create an innovative,
sustainable food production technique in a modest footprint. But how do you actually
mix veggie and fish farming together? There’s several subtypes of aquaponics,
like the low-maintenance deep water variety, space efficient vertical farming, and
the root-protecting nutrient-based beds. Generally speaking they all start with growing
plants in a bed and raising fish in a tank. As the fish thrive and grow, they make a lot
of … how should I put it … organic waste. Fish poop and food scraps. You don’t have to be
an ichthyologist to know that swimming around in their own waste isn’t good for fish. As
the waste breaks down it forms ammonia, which is toxic for most living things. But by
using a bacteria called nitrosomonas, that ammonia can be turned into nitrite. The downside is that
nitrite is actually even more toxic for fish than ammonia because it binds to the hemoglobin in
their blood, preventing it from carrying oxygen. However, this is where our next bacteria
comes into the picture, nitrobacter, which converts nitrites to nitrates. Now we
have water swimming with fish fertilizer and nitrates that we need to get rid of, and hungry
plants who love these compounds. We just pump the fishy water to our plants and they serve as
a biofilter – eating up all those compounds and purifying the water, so it’s ready for the
fish and the whole process to start again. The beauty of aquaponics is that
it simulates a natural ecosystem, with plants, animals and microorganisms all
working in symbiosis to make a self-contained, sustainable and self-managing system (somewhat).
Just like a natural ecosystem you rarely need to add more water. The natural cycles at play
here mean water in an aquaponics system can be continually reused, which reduces
water consumption by 90% when compared to traditional agriculture. Since the fish are
continually filling the water with plant food, you don’t need to add additional nutrients to
the water as you would with hydroponics. However, you do get some of the big benefits
of hydroponics, like plants growing larger and faster than traditional soil-based
agriculture because of all the room to grow, fresh air, and constant access to nutrient-rich
water. And between the fish and lack of soil, there’s no need to use environmentally harmful
fertilizers or worry about soil-borne pests. Another benefit of soil-less solutions like
hydroponics and aquaponics is we don’t need to worry about arable land. As long as
there’s room for an aquaponics facility, regions that aren’t otherwise suited
to agriculture can start growing big, nutritious fish and vegetables. This
can cut down on transportation costs and carbon emissions too, as spaces like empty
warehouses or rooftops in the heart of population centers can be converted into productive aquaponic
farms. And fish are one of the most efficient animal protein sources. The feed conversion ratio
(FCR) describes how much feed is required to produce 1 kg of meat. The most commonly eaten
animal protein on earth right now is pork, which has an FCR of 4:1, but fish like salmon
or tilapia clock in at around 2:1 or less. But is this technique scalable? Well, it might
be the most scalable piece of tech we’ve ever explored on the channel. You could create a
small system to raise herbs and decorative fish on your kitchen windowsill, but it can
scale up to backyard aquaponics systems or all the way up industrial scale … kind of
like Superior Fresh’s 6-acre industrial agribusiness greenhouse. Combining your protein
and vegetable needs into the same footprint (no matter the size) is of course an efficient use of
water and space. Just like we touched on earlier, aquaponics can incorporate vertical
farming techniques to increase that space efficiency even further. With
more food from a smaller footprint, and less carbon emissions and
water-use, what’s the catch of the day? While aquaponics boasts many of the
benefits of a functioning ecosystem, it also suffers from its weaknesses too. Just
like a natural ecosystem, one problem can cascade into catastrophe. Even though there
may be fewer pests due to a lack of soil, you’re still raising multiple types of organisms
that have different disease vectors. And because the fish and crops rely on each other to survive,
if a lucky illness manages to take out one half of your aquaponics set up, the other side is doomed
as well. And if bugs do get a foothold in your system you can’t use chemical pesticides to get
them out or you'll risk poisoning your fish too. Have you ever had to take care of a fish?
As anyone who has kept them can tell you, keeping the parameters just right can be a
challenge. Most fish species prefer pH levels around 7-8, while plants tend to want more
acidic water with a pH of 5-6.5. Of course the bacteria prefer alkaline waters with a
pH of 8-9. Making sure every organism gets what they want leaves the caretaker with
a slim Goldilocks zone and little margin for error. Complicating things is the fact pH
levels oscillate all the time due to an array of natural factors. So while lower maintenance
than say, traditional farming or hydroponics, aquaponics requires near constant monitoring.
Population control presents another issue. Too many fish and their waste can clog your system or
overwhelm your plants and microorganisms. If fish feel too crowded or stressed they’ll stop growing
or just drop dead, which isn’t ideal for a food source. But too few fish and now your bacteria
and plants start to starve. Then there’s algae, who love an aquaponic ecosystem for all
the same reasons that your crops do. If conditions in your aquaponics tank are just
right, it can cause a suffocating algal bloom. There’s also temperature concerns. Once again
fish, plants and microbes tend to have slightly different preferences here, which leaves you with
little margin for error And if your aquaponics system isn’t inside of a temperature controlled
structure, maintaining the correct temperature poses an even greater challenge. Tilapia is
considered the gold standard for aquaponics because it can grow to a mature size in just
8 months, it self regulates its population, and is very resilient to a wide range of
temperatures and water qualities. But even tilapia start to struggle in temperatures below
65°F(~18°C), and will die if the water temperature dips below 50°F(15°C). That means the gold
standard of aquaponics can’t be farmed outdoors all year except in very warm places. There are
of course fish better suited to cold temperatures like the trout used in Superior Fresh’s massive
facility, but they’re not as easy, quick, or cheap to raise as tilapia. Outdoor facilities face yet
more challenges in the form of increased water loss from evaporation, are more vulnerable to
outside pests and predators impacting your stock, and are subject to local weather. This doesn’t
invalidate outdoor aquaponic systems but it certainly makes them more challenging for the
types of communities that might need them most. Aquaponics also may not be as sustainable as they
first appear. While we shouldn’t discount the water-saving benefits, keeping all that water
moving requires precious electricity, as does keeping the grow lights on. This can drive up fish
and produce costs compared to traditional farming. So how does the economic side of the equation
look? The initial investment for an aquaponics system can be steep. Aquaponics expert Murray
Hallam puts the startup cost of even small aquaponic farms at about $20,000 - $50,000.
Something that size would only be capable of earning between $500 to $1,000 a week, but
location and market factors can cause your ROI to vary widely. A John Hopkins university
study of over 250 aquaponics facilities showed that only a third of them were profitable.
Granted, many of the aquaponics facilities studied were newer and expected to be profitable
the following year, but still, these aren’t the kinds of numbers that excite entrepreneurs or
investors. The study also found that the most profitable aquaponics farms didn’t just rely
on aquaponics, but diversified their “revenue stream by selling non-food products, services, or
educational trainings[sic].” Ultimately, the study concluded more research was needed. A separate
2019-2021 study reached a similar conclusion, noting that the most profitable aquaponics
ventures were more likely to have warmer weather, access to high end markets and were selling things
beyond the food they produced. And a literature review from Oklahoma State noted that data from
the plant side of aquaponics was promising, but the fish side tended to break even or incur a
net loss. Cornell’s Michael Timmons, a specialist in Biological and Environmental Engineering also
noted, "The aquaponics industry itself is really, really, really, really small… They're very,
very difficult … (and) they almost always fail." In all these studies, it was clear that it didn’t
matter whether you’re talking about soil-based, aquaponic, or any other farming method, the profit
margins on farming in general are slim. And while the crops grew faster with aquaponics and could be
sold at higher organic-level prices, it's hard to keep up economically with traditional farming’s
cost advantages. Dirt and fertilizer are cheap, and sunshine is free. So while it's hard to
state conclusively at the moment, it does seem like traditional, wasteful agriculture has
the edge in profitability, at least for now.. Aquaponics has exciting, tangible potential,
but the technology isn’t mature enough for us to tell if it’s really a commercially viable
farming-alternative, or just another cool gadget for the eco-friendly, resilience-minded
hobbyist. The challenges are many, but if we can fully realize this technology
and bring the costs down? The benefits of healthy fish and veggies farmed sustainably
just about anywhere are too good to pass up. There’s reasons to be optimistic too. In 2020
Superior Fresh produced 200,000 pounds of salmon and 3 million pounds of salad greens in chilly,
landlocked Wisconsin. In traditional agriculture this would have taken over 100 acres of land,
but thanks to aquaponics, Superior Fresh did it in only 6 - and it was profitable enough that
they’re expanding their aquaponics operations. If their techniques prove to be repeatable,
then I’ll be very hopeful about aquaponics as a commercial avenue. And even if we can’t bring the
costs down, maybe the price is right for local, sustainably grown, high-quality food in places
that just wouldn’t have access to it otherwise. Aquaponics may not be the silver bullet for
the future of all farming and food production, but it could be a compelling solution for
specific regions of the world … or your backyard. So what do you think? Do you think aquaponics
is something to keep investigating and that will impact the future of farming? Jump
into the comments and let me know. And be sure to check out my follow up podcast
Still TBD where we'll be discussing some of your feedback. If you liked this video,
be sure to check out this one on vertical farming. Thanks to all of my patrons,
who get ad free versions of every video, for your continued support. And welcome
to new Supporter+ member Will Hodges. And thanks to all of you for watching and
commenting. I’ll see you in the next one.
