How to Raise Trout in Aquaponics Systems

If you live in a colder climate and are looking to raise a deliciousfish that grows well in cooler water, then a raisingrainbow trout aquaponics system is for you. Trout is a cold-water fish that is not difficult to raise because these fish species do not require complex care. 

However, many newbie aquaponics growers tend to shy away from raising trout because of their unfamiliarity with the fish's growing requirements. This article will explore the factors to consider in raising trout in aquaponics systems. We aim to provide you with a guide to get started and maintain a successful and sustainable trout aquaponics system.

Why Raise Trout in Your Aquaponics System? 

Trout has a delicious flavor and great texture and is a fast-growing freshwater fish cultivated widely in countries with colder climates. They grow into plate size faster than other fish species, which is excellent in aquaponics systems because it would mean double income from fish and plant harvest. Trout can also tolerate a range of temperatures, which is why it is gaining popularity as one of the best fish species to raise in aquaponics systems

Advantages of Raising Trout in Aquaponics

When it comes to selecting the right fish for your aquaponics system, trout offers several compelling advantages:

  1. Impressive Growth Rate: Trout are known for their rapid growth, which makes them a preferred choice for aquaponics. They can reach harvestable size in a relatively short period, typically 12-18 months, depending on factors like water temperature and feeding practices. This speedy growth ensures a quick turnaround on your investment and a consistent supply of fish for consumption or sale.

  2. Temperature Tolerance: Another advantage of trout is their ability to thrive in a wide range of water temperatures. Rainbow trout, for instance, can adapt to temperatures between 50-70°F (10-21°C). This adaptability allows aquaponics enthusiasts to raise trout in various climatic conditions, from cool, temperate regions to controlled indoor environments.

  3. Nutrient Production: Trout are voracious feeders and can generate ample waste in the form of ammonia, which bacteria in the system convert into nitrates. These nitrates serve as a valuable nutrient source for the plants growing in the aquaponic system's grow beds.

What are the Different Species of Trout? 

There are 14 varieties of trout fish species that exist around the world, but the most common varieties used for aquaponics systems are:

1. Rainbow Trout

Rainbow trout is the most famous trout fish specie for aquaponics systems. They can be identified through the prominent pink stripe on their side, an array of black spots, and pink or red cover over their gills. They are usually found in cold mountain streams, but trout can tolerate various temperatures. 


Rainbow Trout in Aquaponics

2. Brook Trout

Also called speckled trout, the brook trout typically live in cold water streams and are native to Eastern North America in the US and Canada. They are a member of the Salmonidae family, which includes salmon and some cold-water fish species. The Brook trout can be easily distinguished from their yellow spots on an olive-green back.

Brook Trout in Aquaponics

3. Brown Trout

The brown trout, also called the European trout, is Native to Europe and Western Asia, but can also be found in North America. Brown trout do not necessarily come in brown color. They come in various colors, which include silver and golden, depending on where they live. They can be distinguished by the orange-red markings surrounded by silver rings and their salmon-like appearance. 


Rainbow Trout

What Trout Species is Best for Aquaponics?

The best trout species for aquaponics systems is the rainbow trout. This is because rainbow trout is the hardiest trout variety and requires less maintenance. These features make rainbow trout easy to grow for farming and with plants in aquaponics systems.



Growing Requirements for Trout in Aquaponics Systems

Here are the growing requirements for raising trout in aquaponics systems. 

1. Stocking Density: For trout, it is recommended to have a stocking density of 7-10 gallons of water for every 1 lb of fully mature fish.

2. Tank Size: The minimum tank size requirement for trout is at least 200 gallons. This means you will need a larger fish tank to grow more trout. Overcrowding your tank might cause problems such as stunted fish growth and low dissolved oxygen levels.

3. pH Level:Trout require a pH level range between 6.5 - 8 to thrive. 

4. Water Temperature: Being a cold-water fish, trout thrives in a temperature range of between 56°F and 62°F (13°C - 16°C).

5. Fish Diet: Trout are carnivorous fish. They required a diet that consisted of 40-50% protein fish food. The fish feed must be of high quality to ensure proper growth, health, and delicious flavor of the fish when they are harvested.

6. Feeding: Feed the fry at least ten times a day at the start. However, the feeding frequency will decrease to two to three times a day when the fish matures. Since trout live in cooler water, they have slower metabolisms than the other fish. So make sure not to overfeed and underfeed your trout to maintain their health.

7. Oxygen Requirements: Trout requires higher levels of dissolved oxygen. The recommended DO level for them in the tank is 7.0 ppm. 

8. Breeding:To breed trout, collect the milt from the male and strip the female of their eggs. Collecting milt from more than one male is recommended to ensure fertilization. Mixed the milt with the eggs and add water to the mixture to activate the sperm to begin fertilization. Once fertilized, the eggs are then ready to transport 20 minutes after and should be done within 48 hours. Avoid direct sunlight to the embryos for them to survive. 

Factors to Consider in Raising Trout

Below are a few factors to consider on how to raisetrout in your backyard. 

1. Fish Tank

Trout are large fish species and require larger fish tanks. Large tank sizes will give them enough space to swim and dilute water quality issues. As mentioned above, the minimum tank size requirement for trout is 200 gallons. 

Trout don’t perform well in warm and stagnant water. They prefer water with a fast flow rate because this ensures that waste will not be stagnant at the bottom of the tank.

2. Filtration System

Monitoring the ammonia, nitrite, and nitrate levels is essential for growing trout. Trout thrives in a healthy and clean environment. So, make sure to monitor the water quality of your system. An additional filtration system is recommended for raising trout to maintain the water quality in the fish tank.

3. Water Quality

The natural habitat for trouts is clean, cold, and well-oxygenated mountain stream water. It is essential to imitate their natural habitat in the fish tank for their health. As much as possible, maintain the good water quality in the fish tank and ensure that the pH, dissolved oxygen, temperature, and other water quality parameters are within their ideal range. 

Trout thrive when the water temperature is within the ideal range of 59°F and 85°F, but their growth rates will begin to decrease above 70°F. So, as much as possible, keep the water temperature cool. Spawning starts when the water temperature is at 50°F, and a female trout may produce eggs as many as 12,000.

Although trout do not like dirty water, they have a very strong tolerance to salinity, and many trout varieties can still survive in brackish water and other marine environments. The acceptable pH range for trout is between the range of 6.7 to 8.2. However, regular monitoring, filtration systems, and air pumps can help maintain good water quality.

Trout in a pond

Caring for Trout in Aquaponics Systems

Fish health and care are critical and essential to your aquaponics system's overall health and function. So, understanding what your fish needs is an integral part of running a successful aquaponics system because waste production slows if the fish are unhealthy, resulting in poor plant growth and harvest.  Monitoring and a regular water test are essential to the success of your system—the best time to monitor the behavior of your trout fish is during feeding. 

Here are some essential ways of maintaining a healthy trout in your aquaponics system:

  1. Observe fish before and after daily feeding and note how much feed is eaten.
  2. Observe and take notes of the fish's behavior and appearance daily.
  3. Understand the signs of fish stress, disease, and parasites.
  4. Maintain a low-stress environment with consistent good water quality, specifically for the system's fish.
  5. Use the proper stocking density and feeding rates.

Healthy Fish Behavior

A healthy trout shows the following behavior:

  1. Extended fins and straight tails.
  2. A graceful pattern of swimming. No lethargy. 
  3. A healthy appetite and not shying away at the presence of the feeder.
  4. No marks, discolored blotches, streaks, or lines.
  5. Not rubbing or scraping on the sides of the fish tank.
  6. Sharp, clear, and shiny eyes.

Tips on How to Prevent Fish Diseases in Your System

  1. Purchase healthy fish from a reliable and reputable fish supplier.
  2. Quarantine new fish in a separate tank before introducing them into an established fish tank.
  3. Feed the fish with a proper, varied, well-balanced diet.
  4. Keep your system's water quality clean and ensure it is within the ideal water quality parameters of pH, ammonia, nitrites, nitrates, and temperature.
  5. Ensure enough aeration to keep the DO as high as possible.
  6. Remove uneaten fish food from the tank.
  7. Ensure that the water is from an excellent source, clean, and chlorine-free.
  8. Make sure that the fish tank is in an excellent shaded place.
  9. Follow the standard hygiene procedure by washing hands and using clean gear or equipment.
  10. Treat the disease as soon as it is identified.


You can successfully raise trout fish in your system if you live in a cooler climate, maintain good water quality, and follow the growing requirements for trout. Thank you for reading our article. Read “The Ultimate Aquaponics Beginner's Guide” to learn more about aquaponics. 


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