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Page 2 about

Feeding Spirulina


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This page contains more information about using spirulina algae as a food for fish and other aquatic animals.

Click here to go to the first page in this discussion.

9. Increased Survival Rates
Studies in Japan on marine yellowtail showed that fingerlings fed a ration of 0.5% (5 ppt) spirulina resulted in a significant gain in survival over the non-Spirulina fed group.

Similar results were obtained from professional Discus fish breeders whom incorporate Spirulina powder into the diet for newborn Discus fry.
10. Less Medication
Fish farmers have found that including Spirulina in the diet reduced the amount of medication or therapeutics that are normally required to treat sick fish.

Spirulina also reduced toxicity of medications and may itself have anti-viral properties.

Most disease treatments on the market are "water baths" in which the fish must absorb the drug from the aquarium water. Unfortunately, the treatment water is often 

Discharged down the drain into our environment and waterways. Orally feeding your fish a diet containing Spirulina could effectively reduce or eliminate the need for bath treatments.

Using Spirulina algae as a "prophylactic" treatment in place of antibiotics can effectively reduce wastewater pollutants, eliminating costly treatment systems and increases the effectiveness of existing systems.
11. From the website at

Unusual phyto-nutrients for health and cleansing. 

Scientists are discovering the benefits of polysaccharides, sulfolipids & glycolipids, and the rainbow of natural pigments that give spirulina a deep green color.

Green (chlorophyll), blue (phycocyanin) and orange (carotenoids) colors collect the sun's energy and power growth. Chlorophyll is a natural cleanser and is often referred to as nature's green magic.

12. From the web page at

Why is it important to have Spirulina in exotic fish diets? For many species of exotic aquarium fish, algae are an essential part of the diet.

Lettuce and spinach are poor substitutes for algae: they do not have the same nutritional value. Spirulina has several important nutritional features that are important for beautiful healthy fish. 

Spirulina's cell wall is rich in muco-proteins that enhance the natural mucus layer of the fishes skin. This results in a shiny appearance, healthier fins are less app to tear, and improved resistance to skin infections. Spirulinas soft cell wall enables it to be easily digested.

Many fish, especially African Cichlids and Gold Fish, eat a lot of blue green algae and the wild. Blue green algae like Spirulina have a special protein called Phycocyanin not not found in another algae or terrestrial plants.

Japanese scientists have linked Phycocyanin to improved kidney and liver function. The effects of Phycocyanin are the reasons that Japanese fish farmers make extensive use of Spirulina. 

Their experience is that the fish grow less obese and have improved survival rates, superior growth and appearance over those not fed Spirulina. This, of course, means higher selling prices for them.

Spirulina and other micro-algae contain essential fatty acids that are essential for proper development and functioning of the internal organs. Without the proper fatty acids, many saltwater fish will not breed or survive.

Coloration in fish depends to a large degree upon the pigments that they get from their food. The most important pigments are of a class called carotenoids.

These include beta-carotene and xanthophylls. Fish Species very greatly regarding the type of carotenoid pigments they can use, and how they individually exhibit these coloring agents in their skin.

Hence the great for variety of colors in fish Spirulina is the natural food highest in carotenoid pigments, some 20 times the amount found in carrots. Spirulina contains at least six forms of this pigment providing a "rainbow" of color possibilities.

When feeding your fish a food containing Spirulina, you will see better colorations within a few weeks.

Spirulina is a rich source of A and B vitamins, especially B-12, and naturally chelated and bio-available calcium and iron.

Click here to buy fish food with an ample amount of Spirulina.
13. From the web page at
Aquaculture farmers have discovered three key benefits to adding Spirulina to their feed. These are:

Better Growth Rates:

Increase palatability results in:

a.  Reduction of wasted feed (lower cost).
b.  Lower feed conversion ratio.
c.  Lower feed conversion ratio and higher nutrient uptake.

Increased intestinal flora in the animal, which results in:

a.  Increased nutrient utilization.
b.  Production of vitamins and displacement of harmful bacteria.

Increased fat transporting enzymes which results in:

a.  Reduced fat storage in flesh.
b.  Improved utilization of fat for growth.

Feed containing 2.5% Spirulina was given to Cherry Salmon for a five month period and resulting in:

A nearly 23% increase in growth.
Improved skin and fin appearance.

Increased Survival Rates:

Taiyo Fisheries added 5% (50,000ppm) Spirulina to Yellowtail fingerling feed in a 60-day test and the results were:

a.  Reduction of mortality rate by 14%.
b.  Increase of growth rate by 19%.
c.  Overall production increase of 39%

Spirulina improved taste, texture and coloring in farm fish by:

a.  Providing essential nutrients found in the animal's natural food chain, but not in commercial feeds.

b.  Providing up to 50,000ppm of carotenoids that fish utilize for coloring.

c.  Supplying zeaxanthin, which can be converted to astaxanthin (in certain species) for coloring of flesh as well.

d.  Using Spirulina as a feed supplement results in better growth rates, increased survival rates, and improved quality and coloration of species. This results in cost savings and increased profits for your business.

From the web page at
14. Anti-Cancer Effects
Several studies show spirulina or its extracts can prevent or inhibit cancers in humans and animals. Some common forms of cancer are thought to be a result of damaged cell DNA running amok, causing uncontrolled cell growth.

Cellular biologists have defined a system of special enzymes called endonuclease which repair damaged DNA to keep cells alive and health.

When these enzymes are deactivated by radiation or toxins, errors in DNA go unrepaired, and cancer may develop.

In vitro studies suggest the unique polysaccharides of spirulina enhance cell nucleus enzyme activity and DNA repair synthesis.

This may be why several scientific studies, observing human tobacco users and experimental cancers in animals. report high levels of suppression of several important types of cancer after being fed whole spirulina or treated with its water extracts.

Spirulina is a powerful tonic for the immune system. In scientific studies of mice, hamsters, chickens, turkeys, cats and fish, spirulina consistently improves immune system function.

Medical scientists find spirulina not only stimulates the immune system, it actually enhances the body's ability to generate new blood cells.

Important parts of the immune system, the bone marrow stem cells, macrophages, T-cells and natural killer cells, exhibit enhanced activity.

The spleen and thymus glands show enhanced function. Scientists also observe spirulina causing macrophages to increase in number, become "activated" and more effective at killing germs.

Feeding studies show that even small amounts of spirulina build up both the humeral and cellular arms of the immune system.

Spirulina accelerates production of the humeral system (antibodies and cytokines), allowing it to better protect against invading germs.

The cellular immune system includes T-cells, macrophages, B-cells and the anti-cancer natural killer cells.

These cells circulate in the blood and are especially rich in organs like the liver, spleen, thymus, lymph nodes, adenoids, tonsils and bone marrow.

Spirulina up-regulates these key cells and organs, improving their ability to function in spite of stresses from environmental toxins and infectious agents.
15. From the web page at

Spirulina flakes are available from several manufacturers and are a vitamin-rich, vegetable supplement for live bearers and plant eating tropical and marine fish. An excellent supplement for Goldfish too! Too much Spirulina can be harmful.

Spirulina does not cloud water when used as directed.

Click here to buy fish food with an ample amount of Spirulina.
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