Nannochloropsis australis "round cells culture"

Nannochloropsis is a widely used microalga in aquaria and aquaculture, valued for its nutritional profile and environmental benefits. Here’s how it contributes to marine ecosystems and how you can cultivate it:

Uses in Aquaria

• Nutritional Benefits: Nannochloropsis is rich in eicosapentaenoic acid (EPA), a crucial omega-3 fatty acid that supports marine life.
• Water Quality Improvement: It helps assimilate excess nutrients, such as nitrate and phosphate, reducing unwanted algae growth.
• Enhanced Feed for Marine Life: It is commonly used to gut-load rotifers and copepods, improving their nutritional value for fish and invertebrates.
• Biofiltration Properties: Some strains of Nannochloropsis have been used as biofilters in aquaculture systems.

Cultivation Tips

• Nutrient Optimization: Adjusting nitrogen and phosphorus levels can enhance growth and lipid production.
• Light Conditions: Moderate light intensity and photoperiod control help maintain healthy cultures.
• Culture Media Preparation: Using sterile seawater and proper aeration ensures optimal growth.
• Growth Monitoring: Regularly checking cell density and nutrient levels helps track culture health.
• Scale-Up Strategies: Large-scale cultivation requires CO₂ supplementation and nutrient adjustments to maximize biomass productivity.

---

How to Grow Nannochloropsis Using F/2 Guillard’s Fertilizer

Nannochloropsis is a small, non-motile green algae rich in EPA (eicosapentaenoic acid), commonly used in aquaculture for feeding rotifers, copepods, and filter feeders. Culturing it with F/2 Guillard’s Fertilizer ensures optimal growth and nutrient enrichment.

Materials Needed:

• Culture Vessel (Clear plastic or glass container)
• Freshly Mixed Saltwater (Salinity: 1.015 - 1.020 SG)
• Live Nannochloropsis Starter Culture
• F/2 Guillard’s Fertilizer
• Unscented Household Bleach (7.5% Sodium Hypochlorite)
• Sodium Thiosulfate (Chlorine Neutralizer)
• Air Pump & Airline Tubing (For aeration)
• LED Grow Light (12-24 hour photoperiod)
• Sterilization Supplies (Hot water, isopropyl alcohol)

Step-by-Step Culturing Process:

1. Sterilize the Culture Vessel:

   • Wash with hot water and isopropyl alcohol to remove contaminants.

2. Chemically Sterilize the Water:

   • Use RO (reverse osmosis) or filtered seawater.
   • Add 0.14 mL of bleach per liter of water (~2.5 ppm concentration).
   • Let sit for 30 minutes to kill bacteria and competing algae.
   • Neutralize with sodium thiosulfate (1 drop per liter).
   • Aerate for several hours and test for chlorine before use.

3. Prepare Saltwater:

   • Adjust salinity to 1.015 - 1.020 SG.

4. Add Nannochloropsis Starter Culture:

   • Use a 1:4 ratio of phytoplankton to saltwater.

5. Add F/2 Guillard’s Fertilizer:

   • Apply 1 ml per liter of culture volume.

6. Provide Aeration:

   • Insert airline tubing and aerate vigorously to keep nutrients evenly distributed.

7. Set Up Lighting:

   • Use an LED grow light with a 12-24 hour photoperiod.

8. Monitor Growth & Harvest:

   • Ready for harvest in 5-9 days.
   • If color fades, add F/2 fertilizer as needed.

9. Storage & Restart:

   • Nannochloropsis can be refrigerated and restarted.
   • Store excess phytoplankton refrigerated and shaken daily.
   • Can be used to start a new batch even after 8 weeks.

By following these steps, you can successfully culture Nannochloropsis for aquaculture, reef tanks, and marine ecosystems.