10/11/2026
🔬 **NEW PHYTOPLANKTON AT PODDROP: PAVLOVA LUTHERI **
Not all phytoplankton provide the same nutrition. Meet Pavlova lutheri (accepted scientific name: Diacronema lutheri), a marine haptophyte used in live-feed aquaculture.
🧬 MICROBIOLOGY
At approximately 4–6 µm, each cell contains photosynthetic pigments, moves with two unequal flagella, and bears a short haptonema—an appendage characteristic of haptophytes. Its small size makes it accessible to many planktonic grazers and suspension feeders.
🧪 WHY EPA + DHA MATTER
Pavlova synthesizes two important long-chain omega-3 polyunsaturated fatty acids:
• EPA (20:5n−3): Involved in membrane structure and lipid-mediated signaling.
• DHA (22:6n−3): A major structural fatty acid, especially important in developing neural and visual tissues of larval fish.
These compounds move from phytoplankton to zooplankton and onward through marine food webs.
🦐 AQUACULTURE APPLICATIONS
Pavlova is used in diets for copepods, rotifers, and bivalve larvae. When zooplankton consume these cells, algal nutrients can be transferred to fish and invertebrate larvae that feed on them.
🦪 WHY MIXED PHYTOPLANKTON DIETS MATTER
Different microalgae provide different cell sizes, sterols, and fatty-acid profiles. Hatchery protocols frequently combine Pavlova with diatoms such as Chaetoceros rather than relying exclusively on one algal species.
⚗️ THE SCIENCE BEHIND CULTURE QUALITY
The EPA:DHA profile is not fixed. Temperature, light intensity, nutrient availability, and growth phase can influence lipid production.
A darker, denser culture is not automatically more nutritious. Cell concentration and biochemical composition are two different measurements.
🌊 WHAT DOES THIS MEAN FOR REEF AQUARIUMS?
Live phytoplankton can provide nutrition to compatible filter feeders and planktonic grazers, indirectly supporting the marine food web. Actual consumption depends on the organisms present, their feeding preferences, and particle size.