D.5.0 | Rotifer Production: Liquid Microalgal Feeds

Feed, Feed, Feed!

Quality feed is an essential (and probably the most important) requirement for quality rotifers and clean and productive culture systems. The best all-around feeds are liquid microalgal feeds. Nannochloropsis- and Chlorella- based microalgal grow-out feeds are outstanding. Liquid microalgal feeds:

  1. Are exceptionally clean and easy to use.
  2. Allow high-density, high-yield production.
  3. Promote rotifer health, vigor, and cleanliness.
  4. Produce stable and reliable rotifer cultures.
  5. Reduce cost by reducing requirements for labor, space, and other resources.
  6. Through improved rotifers, increase larval survival and hatchery productivity.

Microalgae are naturally microencapsulated feeds and effectively deliver many critical nutrients, both obvious (protein, lipids) and non obvious (vitamins, carotenoids, minerals, etc.) that are critical for maximum rotifer production and larval nutrition.

Key Qualities of Effective Liquid Microalgal Feeds

  • Biologically Clean – The Synergistic Effect of Microalgae
  • Net Biomass Conversion
  • Pre-enrichment
  • Cost

Biologically Clean

The Synergistic Effect of Microalgae

Liquid microalgal feeds are exceptionally clean feeds. There are a number of factors that come together when microalgal feeds are used to produce such clean and healthy rotifer cultures.

Microalgal feeds:

  1. Are nutritionally balanced and promote vigorous, healthy rotifers that grow rapidly, aggressively consume feed and resist harmful bacteria.
  2. Support very high rotifer growth rates, resulting in cultures with a high proportion of young rotifers. These rotifers are by their very nature healthy and clean. This is because rotifers are free from fouling bacteria and are healthy when they hatch. Internal and external fouling of the rotifer takes time, and rotifers produced a high growth rate can have a median age of 28 hours or less. (see Growth rate and Age chart below).
  3. Table D.1


  4. Are very efficiently consumed and produce relatively little waste (see the last row in the table in the “Net Biomass conversion and optimum fed rate section” below).
  5. Are naturally microencapsulated and do not release their nutrients prior to being ingested by the rotifers.
  6. Promote the presence of beneficial bacteria that displace harmful and pathogenic bacteria.

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