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Enriching with Spirulina

Spirulina-Enriched Artemia Enhances Immune System

By Brian Portoni, et al., 1996. American Fisheries Society, Fish Health Section. USA


The cyanobacteria spirulina is commercially produced for human consumption as well as agricultural feed ingredients. Recently, whole spirulina and cell extracts were found to enhance immunity in animals by increasing phagocytic activity. The purpose of this study was to determine the effect of spirulina-enhanced diet on the nonspecific immune response of channel catfish, ictaluras punctatus. The sample population consisted of "young of the year" channel catfish obtained from Fish Producers, Niland, CA. Fish (50/tank) were maintained in glass aquaria equipped with under-gravel filters.


All fish were fed a diet of Trout Starter Diet (Rangen, Inc.) for a month until they were large enough to ingest adult brine shrimp (artemia franciscana). The control diet consisted of adult brine shrimp. The test diet consisted of adult brine shrimp bioencapsulated with spirulina. Adult brine shrimp were allowed to feed on dried spirulina powder for 3-4 hours to maximize bioencapsulation.


Preliminary studies indicated that channel catfish fed spirulina had an increase in the number of splenic macrophages determined by esterase staining compared to controls. Not only were more macrophages present in the spleen, but also the macrophages appeared activated. Activation determined by morphology on scanning electron microscopy, was characterized by the presence of numerous folds and ruffles. This research was performed on a single population of catfish over a period of months. While data suggests nonspecific immunostimulation elicited by spirulina in the diet, further study on different populations of fish is underway to confirm the preliminary data.


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Important Message

Happy Fourth of July from the folks at Brine Shrimp Direct

For the week of the Fourth, we will be closed on Wednesday and Friday. If you are ordering perishable or frozen products during this week, we will be required to ship on Monday for Next Day delivery or on Thursday for Next Day delivery only. Next Day shipping rates will apply. It is advisable that you call us (801-782-4700) to confirm that we have received your order and will be able to ship before the applicable FedEx cut-off time. Orders not placed with overnight shipping will ship on Monday, July 9th.

Thank you for your understanding and have a safe and relaxing 4th of July!