Aquaponics How Many Fish Per Litre?

Aquaponics is a unique way of growing plants and fish together in a self-sustaining ecosystem. Aquaponics combines aquaculture (raising fish) and hydroponics (growing plants without soil) to create an endless cycle of life. 

You feed the fish, who then convert their food into waste ammonia, which is used by the plants as fertilizer! 

This creates a closed loop system where neither your plants nor your fish go hungry. The only thing that needs refilling is water, making this sustainable gardening method ideal for folks with limited space or busy schedules.

How Many Fish For Aquaponic System | Fish to Grow Bed Ratio
Aquaponics is a sustainable and efficient method for growing fish and plants in a closed-loop system.
The ideal ratio of plants per fish depends on factors like plant types and nutrient levels.
Setting up an aquaponics system requires careful planning, including choosing the right fish and vegetables to grow.
Aquaponics is a low-maintenance and highly productive farming method.
Certain vegetables like lettuce or spinach do especially well in an aquaponics system.

How Many Fish Per Gallon Of Water?

How many fish per gallon?

1-2 fish per gallon is the general rule of thumb. If you’re building a system with a large volume, think about how many fish you want to grow and then plan accordingly. You can safely go over that number if you have room for them (e.g., if you’re using a pond in your backyard).

TilapiaRapid growth, mild taste, high protein content, and a hardy constitution that makes it suited to aquaponics environments
CatfishGood resistance to high nitrate levels and able to tolerate a wide range of environments
TroutHigh protein and omega-3 content, fast-growing, and a good flavor profile
BarramundiFast-growing and hardy, with a mild and buttery flavor that appeals to many people
Goldfish/KoiAesthetically pleasing to watch, hardy, and can be a food source for people who eat ornamental fish

How Many Gallons Are In A Fish Tank?

A typical 5-gallon aquarium is about 20 liters, so multiply by 20 liters/5 gallons = 4 liters per gallon (4L/gal). 

Large volumes such as ponds or water reservoirs may be measured in acre-feet (acre foot = 43,560 gallons) or cubic meters (cubic meter = 1 million liters), but this isn’t necessary for our purposes here because we’re just looking at small systems on indoor tables!

Aquaponics is a sustainable and efficient method for growing fish and plants in a closed-loop system. If you want to learn how to maximize your produce output, read our article on how many plants per fish to find out the ideal ratio for optimal growth.

How Many Plants Can You Grow In Aquaponics?

You can grow as many plants as you want. This is dependent on the size of your system and the number of fish in it, but generally speaking, if you’re growing plants above water level then there is plenty of room for more. 

You can plant more than one type of plant in the same container; just make sure they don’t compete with each other for nutrients or space.

You could also try experimenting with different types of containers like barrels or even buckets – these aren’t necessary but they will add an extra dimension to your aquaponic setup. 

If you have several small containers but only one large container, then use them! You might have a clumpier-looking system but this won’t affect its functionality at all.

Leafy greensFast growth, high yield, and tolerance to high water levels make them ideal for aquaponics systems. Examples include lettuce, spinach, and kale.
HerbsHerbs like basil, cilantro, and mint grow well in aquaponics systems and can improve water quality. They can also be a valuable source of income.
TomatoesTomatoes thrive in aquaponics thanks to their high nutrient requirements and their ability to produce fruit all year round.
Bell peppersBell peppers need a bit more care and attention compared to other vegetables, but their high market value makes them a great choice for commercial aquaponics systems.
CucumbersCucumbers are vine plants that grow quickly in aquaponics systems and are a popular choice for salad greens due to their crunchy texture and refreshing flavor.

Can You Make Money From Aquaponics?

Yes, you can make money from aquaponics. You can sell fish and plants for profit. The first step is to get your system up and running, then you’ll need to start selling the fish and plants that you grow in it.

You will have to decide whether or not to sell the fish (or just grow them for yourself), but if you do want to sell what you’re growing then there are a few things that will help determine how much money you can make:

  • The type of fish that grow best in your system;
  • The time it takes for those fish to mature;
  • How many of each type of plant grow well in your system;

If all goes well, these factors should allow enough room for profit!

If you are interested in setting up an aquaponics system, our complete step-by-step guide is an excellent resource to help you get started. From choosing the right fish to selecting the best vegetables to grow, this guide covers everything you need to know to set up your own sustainable farming system.

Can Tilapia Live Outside?

Tilapia are tropical fish, and therefore cannot survive in colder climates. If you want to keep your tilapia alive during the winter months, your best bet is to keep them in an aquarium that is heated to around 70 degrees Fahrenheit (21 degrees Celsius). 

You can also use heating pads if you don’t have access to a heat lamp or aquarium heater.

If you’re interested in keeping tilapia outside year-round then you’ll need a heated pond or tank—you should be able to find one at any pet store that sells aquariums. Just make sure it’s big enough for all your fish; otherwise, they might get stressed out from overcrowding!

Which Fish Is Best For Aquaponics?

If you’re planning on starting your aquaponics system, it’s important to know which fish are best suited for your system. 

There are many different types of fish that can be used in aquaponics systems. The type of fish you choose will depend on your climate and whether or not you want to eat the fish yourself or just keep them as pets.

Are you thinking about investing in an aquaponics system but not sure if it’s worth the investment? Our article on is aquaponics worth it will give you an overview of the benefits of this method, including its sustainability, low-maintenance, and high productivity.


Tilapia is one of the most popular edible varieties available for use in aquaponic systems. 

This freshwater fish originates from Africa but has been introduced all over the world due to its ability to live in warm climates and survive on very little food compared to other types of fish.

Such as carp or trout which require colder temperatures and more nutrients than tilapia does when raised domestically indoors under artificial conditions like those found inside an indoor garden or greenhouse setup that serves both purposes rather than being exclusively dedicated solely one way (either growing plants only without any animals present).

What Do They Feed Fish In Aquaponics?

Aquaponics fish food is a very important aspect of the system. Without it, your fish would not survive and you wouldn’t be able to grow any plants.

If you’re just starting with an aquaponics system, there are several different sources of fish food that are easy to get and can be used in conjunction with one another:

  • Pet stores bought organic/human-grade fish food (the most expensive option)
  • Fish farm produced organic/human-grade fish food (the second most expensive option)
  • Homemade DIY homemade (the cheapest option)

Keeping the water in your aquaponics system is important for the health and growth of fish and plants. Learn more about how often you should change the water by checking out our article on how often do you have to change water in aquaponics?

How Much Does It Cost To Set Up An Aquaponic System?

The price of a system depends on the size of your aquaponic system and what materials you use. If you’re looking to build a small, simple system out of plastic buckets, it will cost less than if you wanted to build an automated system with a controller and grow lights.

So how much does it cost? You can spend as little as $50 or as much as $10,000 depending on what kind of setup you’re after. The good news is that even though it might seem expensive at first glance, there’s no reason why setting up an aquaponics system should break the bank.

Do You Have To Feed Fish In An Aquaponic System?

You can feed fish in an aquaponic system. To be precise, you can also choose not to feed your fish. It’s up to you.

Most people who start an aquaponic garden are looking for a low-maintenance approach that allows them to grow food with minimal effort. 

When it comes down to it, feeding the fish is one more thing you have to do for your system to work properly and produce healthy plants and sustainable crops for harvest.

However – there are many benefits to feeding your fish! This includes not only helping them live longer but also boosting their immune systems against illnesses or parasites like worms that may be present on their skin or gills

What Is The Easiest Fish To Raise In An Aquarium?

Betta fish are easy to raise in an aquarium. They are also quite easy to breed and can live in a small tank. Bettas are not very active and therefore do not require a lot of space or large amounts of food. 

Bettas are not aggressive, messy, expensive, or picky about their food. They will eat just about any plant or meat-based cat food you give them!

Aquaponics is an excellent way to grow fresh, organic vegetables right in your backyard. But which vegetables grow best in an aquaponics system? Read our article on what vegetables can be grown in aquaponics to find out which plants thrive in this unique farming method and how to care for them.

Do You Need A Filter For A Betta Fish Tank?

If you have a Betta fish, then you may have noticed that your tank does not need a filter. Bettas are not very messy and the water in their tank stays clear for a long time. This is because they do not create excess waste or food that needs to be removed from the water by filtration.

If you want to keep other types of fish, then it would be better to use an external filtration system (such as a canister filter) than an internal one (such as an under-gravel filter). 

This is because any kind of mechanical or chemical process used in internal filters could be harmful to your fish’s health if it happened inside their body!

You Can Grow Fish And Plants Together, No Soil Required

You can grow fish and plants together, no soil required.

Aquaponics is the combination of aquaculture (fish) and hydroponics (plant) in a recirculating system.

Aquaponics is a sustainable urban food production system with:

  • No soil is needed for plants to grow in – just water!
  • A closed-loop system where all waste from fish goes back into the system, helping your plants thrive!


The great thing about aquaponics is that you can grow more than just fish. You can also grow plants, like lettuce or herbs. It’s a great way to start your garden without needing any soil at all!