What Is Spirulina Fish Food?

 by Dr. Steve Hruby
Reviewed by Dr. Steve Hruby

I am a chiropractor, father, husband, coach, entrepreneur, and motivational speaker. Feeling good about yourself is a choice: My mission is to transform lives through optimized health and overall well-being.

  Fact Checked
 by Rhealyn Tropia, RMT
Reviewed by Rhealyn Tropia, RMT

I’ve been called a Data Ninja, The Fact Checker, and a Human Search Engine. I’m an indie content curator who does research daily, and quizzes myself on the important issues of the day.

spirulina fish food

There is a blue-green alga called Spirulina, found in fresh and saline water. Algae are a great source of protein, and the antioxidant beta-carotene helps give fish and invertebrates their distinctive colors.

It may come as a surprise to learn that among the most popular supplements worldwide is the unattractive green powder known as Spirulina, which is commonly seen in health-food shops.

The name “Spirulina” was created as a marketing phrase to make the consumption of algae more appealing. Spirulina for fish is great for the health of the species. For years, aquarists have used Spirulina fish food to supplement their fish’s regular diet because of its many health advantages over other commercial fish food.

As a result of mineral inadequacies, potassium fertilizers are frequently employed in spirulina cultivation. Spirulina requires a certain level of Potassium (K), which must be supplemented if the water doesn’t have enough of it.

Evidence suggests that its strong antioxidant level and varied vitamin profile provide numerous human advantages, including reducing cholesterol, enhancing digestion, and decreasing the risk of certain cancers. You can also use Spirulina for allergies. It helps by blocking histamines, thus reducing allergy levels. 

Spirulina’s Health Benefits as Fish Food

Spirulina has been known to contain a lot of benefits. Some of the most popular include:

Encourages More Even Growth Rates

A block or pellet of Spirulina contains Iron, B-Vitamins, Niacin, Calcium, Potassium, and Magnesium. It is also quite high in protein. How much protein is in Spirulina, then? It has as much as 70% protein. Protein is essential, and it is the one responsible for growth. 

In fish, Spirulina boosts intestinal flora by aiding in the digestion of previously non – digestible meal components, allowing for a greater nutrient yield. Fish have given Spirulina experience less intestinal congestion, a flatter abdomen, and increased resistance to illness because the helpful bacteria or flora that create vitamins also displace toxic ones.

Enzyme Synthesis

It helps the fish create enzymes that aid in the movement of lipids throughout the body. Instead of letting it accumulate in their bodies, the fish uses the fat as fuel for development.

koi fish in a pond

Improves Color

Carotenoids in high concentrations in Spirulina algae (five parts per trillion) enhance and deepen fish pigmentation. Because of this, goldfish and koi can garner a greater price at the market. The presence of phycocyanin and chlorophyll further boosts skin hues.

Out of all the positive effects of a stronger immune system, the most noticeable is that it promotes more vibrant coloring, which is helpful in its own right but also helps prevent sickness.

Reduces the Need for Antibiotics

Even in tiny doses, Spirulina-containing diets have been shown to lessen the need for antibiotics and other potentially harmful drugs. There has been a rise in the research of Spirulina as an organic immuno-stimulant for shrimp and fish due to the rise in antibiotic-resistant pathogens in aquaculture.

It may be possible to lessen or even eliminate the requirement for bath treatments if you give your fish a diet rich in Spirulina. As a “prophylactic” treatment, Spirulina algae can be used instead of antibiotics to efficiently minimize wastewater contaminants, saving money on new treatment systems while improving the efficiency of current ones.

Improves Fish’s Digestive System

Because of its high fiber content, Spirulina improves your fish’s intestinal health. Nothing works better for relieving constipation in fish like Spirulina.

It is also useful for various gastrointestinal problems, so how often do you feed spirulina to fish? Keeping some at hand to give to your fish regularly is a good idea.

Spirulina as Fish Food: How to Use It

Keep the following recommendations in mind when using Spirulina or feeding it to the fish in your fish tank:

  • Sprinkle a small number of spirulina meals into the aquarium, and watch as the fish gobble it up. Put it on the aquarium’s glass if you choose the stick-on variety.
  • To keep your fish healthy and happy, you need to feed them according to the manufacturer’s recommendations for how often and how much food they should be given.
  • Determine what will work best as fish food. The fish meal with Spirulina is an excellent choice for the aquatic critters in your aquarium. Pellets, Flakes, pills, and other forms are also available. They’re great for your fishy buddies that prefer vegetarian fare and can provide essential nutrients. 
  • Consider your alternatives. Today, numerous spirulina-based fish food varieties. Some of them work great with both marine and freshwater fish. It’s important to remember the products’ intended uses. In this method, you won’t have to worry about whether or not your fish are getting the proper nutrition to grow healthy and strong.

The main question here is can you feed your fish spirulina every day? The answer is yes! For better results, it is better if use daily. 

Things to Know Before Buying Spirulina FAQs

spirulina farming

How Much Spirulina Fish Do Need?

Unfortunately, your fish will not be able to survive on just Spirulina. It’s just a supplement, so take it like one. The amount of Spirulina in a daily meal supplement is usually around 5-10 percent of the total weight. For a more concentrated dose of Spirulina, try the flakes. A little at a time. Always double-check the box for the suggested amounts of any new aquarium supplies.

How Is Spirulina Made Into Fish Food?

To create your spirulina for fish, you can choose any of the following ingredients:

  • Garlic
  • Romaine Lettuce
  • Spirulina powder
  • Dark Leafy greens
  • Corn starch or potato


Step 1: Get everything ready to go in the kitchen. Keep in mind that leafy vegetables need to be washed completely and that vegetables like broccoli and carrots, which are tougher, need to be steamed. However, if any components are frozen, you’ll need to defrost them beforehand. Fish ingredients should have the scales removed and the bones left in place.

Step 2: Next, make sure everything is thoroughly mixed. Combine everything in a blender or food processor and whirl about until it’s uniform.

Step 3: After that, use a filter to remove any solids. Squeeze the contents through a standard-size mesh using a spatula. It is the longest time-consuming step, but it will help eliminate vegetable chunks or bones too large for the fish to digest.

Step 4: Make sure the ingredients are completely dry. Let the fish food dry into flakes for around three to four hours. 

Step 5: Line a large baking sheet with wax. Your dried food won’t stick to the paper as much, which is good because it’s a major problem.

Step 6: Then, slowly pour the finished product over the papers and evenly spread it to make a thin layer. Dry the mixture in the oven at 150 degrees Fahrenheit for a couple of hours until it reaches the desired crumbly consistency.

Step 7: At this point, you can begin dismantling it. During this time, the sheets would be ripped off in large sections. You can manipulate their size by hand until you get the desired result. Put it away in a cold, dark place for later use. 

The fish food is recommended to be stored in a sealed container to stay fresh and usable for longer than a year.

What Makes Spirulina a Unique Fish Feed?

Spirulina got its name because it looks like a spiral under a microscope, which is how it was first discovered. Without a microscope, it looks like the seaweed grass that’s a dark green that grows on the ocean floor or the slimy growths that line the riverbed. Despite its peculiar form, this food source is incredibly healthy. Around 70% of a spirulina plant comprises the beta carotene, protein, and vitamin B12 that make it so healthy.

girl feeding goldfish in a glass bowl

In addition, plant-based protein contains all the normally difficult proteins to find. A full complement of amino acids (62% worth) is included. Spirulina is currently farmed all over the world for use in both human food and fish food. Although spirulina algae are commonly sold as fish food, they have also gained a large following in the health food industry.


Supplementing with Spirulina is a great alternative to the current fish protein diets. Feeding fish spirulina has many health benefits, including promoting rapid growth, fortifying immunity, and warding off disease thanks to its antiviral and antibacterial properties.

Due to how much protein is in spirulina and its ability to deliver full proteins despite its plant origin, spirulina for fish is perfect for your aquatic creatures. It also enhances your fish’s immune system, making them less susceptible to bacterial infections, parasites, and other diseases.

Spirulina fish feed supplements present the required amino acids for fish health and growth. Other essential nutrients are often present in aquatic habitats in their natural state. Spirulina-fed fish are healthier, more energetic, and more likely to stay alive longer than their non-spirulina-fed counterparts. Providing Spirulina to the fish in your aquarium can promote digestive health by making the food more digestible.

Additionally, because of Spirulina’s extraordinary capacity to detoxify the body, fish can be made safer for personal consumption by having heavy metals like mercury, arsenic, lead, and cadmium removed from their bodies. Can I feed my fish spirulina every day? Due to all these benefits, it’s recommended that you use spirulina fish food daily. 

Similar Posts


Leave a Reply

Your email address will not be published. Required fields are marked *