Growing food with fish poop: how these 'farmers of the future' are feeding Toronto

When you ask Brandon Heborand Steven Bourne what they do for a living, don't expect an average answer.

They grow food with fish poop.

The pair co-foundedRipple Farms, an agri-tech startup,in 2016 after graduating fromSeneca College's green business management program.

"Both of us were looking at something that we could apply our knowledge or expertise into to help make the world a better place," Hebor, the company's chief operating officer, said.

The way they decided to do that was tackling the issue of food insecurity.

"Bring the farm to the city to reconnect people with food," Hebor said."That was our starting point at Ripple Farms:how can we bring the farm to the city and engage people with agriculture in a way that they've never interacted before?"

Start-Up City: Learn how these urban farmers are growing food with fish poop

7 years ago

Duration 2:41

Brandon Hebor and Steven Bourne co-founded Ripple Farms, an agri-tech startup, in 2016 as a way to tackle food insecurity in Toronto.

'Undying passion for agriculture'

Bourne, the company's chief executive officer, says he had Ripple Farms in the back of his mind for a while, but it wasn't until he met Hebor that the pieces of the business puzzle started to fall into place.

Hebor is the science part of the duo. He graduated from McMasterUniversity with a degree in environmental science and has been a hobby farmer ever since he planted his first seed at eight years old in his grandparents' garden in Etobicoke.

"But how do you grow up in the city of Toronto and think that you may even be a farmer?"Heborsaid."It's just this concrete jungle or an asphalt farm, in the nicest sense but I had this sort of undying passion for agriculture."

Bourne, on the other hand, has a brain for business. He was 10years old when he first started making money by shoveling driveways, and went on toget a bachelor of business administration at Trent University inPeterborough.

It only took one meeting in the summer of 2016 to plant the Ripple Farms seed. Hebor and Bourne took their idea to Secena'son-campus incubator, HELIX, to get some business coaching, and it took off from there.

"We were two guys with a piece of paper and a dream,"Heborsaid.

They focused their business plan on the idea ofusingaquaponicsto grow food in urban areas. The practice is a combination of aquaculture raising fish and hydroponics, which uses water instead of soil to grow plants.The men decided they would use ashipping container with a greenhouse on top for their operations.

They started small, pouring their own money into a preliminary pilot project thatsecured them several partnerships. Thenthey inked a deal to set up the pilot at Toronto's Evergreen Brick Works in November 2016.

By the following January, they had food growing on site.

The pair used the 160-square-foot vertical farm at Evergreen as a research project, capturing data and understanding how a small-scale operation works. They custom designed the system inside, first growing 365 plants, then scaling up to nearly 600.

When temperatures hit -27 C during their first winter in the steel shipping container, the greenhouse remained at a relatively balmy 14 C.

Bourne said they learned a lot using a from-the-ground-up approach. By starting small and allowingoperations and technologies to progress as they went, they felt ready for the next step: a second farmon Seneca College'sNewnhamCampus.

How it works

The aquatic ecosystem is in the bottom of the shipping container. Forty-five tilapia swim in one 150-gallon tank, while a second tank holds 80 fish.

Hanging above the 150-gallon tank is a shelf containing seedlings planted into a small amount of soil.Warm, moist air rises up from the fish tank, going into the root system of plants like kale, lettuce, Swisschard and mint.

They use tilapia not onlybecause the fish are hardy, but because they area tropical fish. Warmer water evaporating from the tanks means warmer moisture for the plants' roots, making them grow faster.

As well, all of their operations are certified byOcean Wise, which means they are a sustainable seafood option.

A perforated pipe draws water from the centre of both fish tanks, cleaning out sediment, uneaten fish food and fish poop. It then travels to a radial filter thatbrings sediment to the bottom to ensure it doesn't clog the rest of the system.

Finally, the water travels to a bioreactor, where the naturally-occurring nitrobacteria converts toxic fish poop into healthy plant food.

It takes about three weeks for a seed's roots to penetrate the soil. When that happens, it's time for the seedling to move upstairs to the greenhouse where it will spend another month or so before it's ready to be harvested.

Ripple Farms uses what's called a Deep Water Culture system, which means the seedlingssit in holes inStyrofoam instead of being planted into soil. The water is constantly flowing through the system from downstairs, meaning the water is full of nutrients and is also being aerated in the process.

Right now, the food produced at the farm on Seneca's campus is harvested every week and goes directly into the cafeteria's smoothie and salad bars. The goal is to develop Ripple Farms into a large-scale operation.

"It's always been our dream, to get to that large scale feeding as many people as we can," Bourne said.

'A workforce in the future'

Bourne and Hebor say one of their favourite parts of owning the business is theengagement piece. They do educational workshops for children and adults alike to teach them about aquaponics, agriculture, and why Ripple Farms matters.

"If we go into a presentation and Steve and I say, 'We're farmers of the future,' people are like, 'Well, what does a farmer of the future look like?'"Heborsaid.

"At the end of the day, we're trying to inspire people to get into agriculture," Bourne added."The younger generations are so passionate about it. I always say it selfishly, but we need a workforce in the future."

"If we can inspire just one per cent of this population to get into this, that's a win in our books."

Start-Up City is CBC Toronto's five-part digital video series that spotlights some of the GTA's most innovative start-ups.