Understanding the Nitrification Cycle in Aquaponics

Aquaponics is more than just adding fish and plants together in water and expecting them to grow. It is a man-made ecosystem that replicates nature.

This means we need nature’s bacteria to convert the liquid fish waste, ammonia (toxic to fish), into nitrite (still toxic to fish), and finally into nitrate (only toxic in large quantities), which serves as liquid fertiliser for the plants.

Understanding this nitrification cycle is crucial for a successful aquaponics system.

The Role of Nitrifying Bacteria

Nitrifying bacteria colonise the aquaponics system, ensuring that there is a large enough colony to convert ammonia into less harmful compounds.

The good news, is that this bacteria is everywhere in nature, and it will naturally colonise your aquaponics system in time.

There are two main types of nitrifying bacteria involved in this process:

• Nitrosomonas: Converts ammonia into nitrite.

• Nitrobacter: Converts nitrite into nitrate.

Only when nitrate is present in good, consistent numbers, and there is no more ammonia or nitrite, do we consider the ecosystem safe for fish.

This photo shows the water testing using an API Freshwater master Test Kit ~ which include the ammonia, nitrite, nitrate and pH tests.

This example, as there is still nitrite present (the purple colour), the aquaponics system isn't cycled yet.

Monitoring the Nitrification Cycle

To ensure the safety and stability of your aquaponics system, regular water testing is essential.

This helps you monitor the levels of ammonia, nitrite, and nitrate.

How long it takes to cycle your system will depend on several factors:

• Climate: Cold temperatures take longer for the cycle to complete.

• Bacterial Kickstart: Adding bacteria to kickstart your biological filter can speed up the process.

The Needs of Nitrifying Bacteria

For nitrifying bacteria to thrive, they need:

• Water: A consistent supply of water.

• Oxygen: Adequate oxygen levels in the water.

• Ammonia or Nitrite: These compounds are their food source.

The bacteria need a home within the system, often referred to as the biological filter, where they can colonise and grow.

Troubleshooting Your Aquaponics System

When anything goes wrong in your aquaponics system, always start by checking your water tests.

These tests will help you pinpoint any issues with the nitrification cycle.

By understanding and maintaining this cycle, you can prevent crashes and ensure a healthy, thriving aquaponics system.

Understanding the nitrification cycle is fundamental to the success of your aquaponics system.

With this knowledge, you can create a balanced, sustainable ecosystem that supports both fish and plants. Happy harvesting!

Learn More About Aquaponics

To dive deeper into the fascinating world of aquaponics and gain step-by-step guidance, get instant access to your free online aquaponics mini-course. This course will show you how aquaponics works and what you need to take the next step in setting up your system. Sign up HERE

Check out My YouTube Channel 'Candy The Aquaponics Lady'

Aquaponics is an ecosystem, and with anything it takes time to learn how it works. So, sit back and binge watch my 'how to' playlist and the 'Water Quality Made Simple' Playlist, and learn the next steps in your aquaponics system as you create the ecosystem.

Here are the next 2 videos I recommend you watching to create your ecosystem ~ before you add any fish

How Aquaponics Works as an Ecosystem

How to Cycle Your Aquaponics System (How to colonise it with bacteria)

Learn More About Aquaponics

Check out the COURSES page to learn how you can get started with aquaponics now. Click HERE.

Want to help out and Feed my Fish?? (They don't drink coffee)

Candy Alexander is a dedicated aquaponics enthusiast with a wealth of formal training in aquaculture. Over the past 15 years, Candy has been deeply immersed in both commercial and backyard aquaponics, honing her skills and expertise in this sustainable farming method.

Candy's passion lies in making aquaponics accessible to everyone. With a mission to simplify aquaponics, she believes that anyone can embark on this sustainable journey.

She encourages those new to aquaponics to "kick the tires" without a significant financial investment. Her guidance focuses on helping people start their aquaponics journey with small-scale systems, ensuring a low barrier to entry for newcomers.

Candy shares practical tips, step-by-step guides, and personal stories to inspire and guide readers on their aquaponics adventure. Whether you're a seasoned farmer or a curious beginner, Candy Alexander is your go-to source for simplifying aquaponics and fostering a sustainable gardening experience.