The Larvae Fountain: How BSF Turn Eating into a Team Sport

What can we learn from the feeding behaviour of Black Soldier Fly (BSF) larvae?  

A fascinating study from the Georgia Institute of Technology reveals that BSF larvae do not just feed randomly—they form a living fountain to consume food more efficiently. This collective behaviour has valuable implications for insect farmers and sustainable food systems. 

 🔄 How BSF Larvae Form a Living Fountain 

When thousands of BSF larvae gather around food, something remarkable happens. Larvae crawl in from underneath, feed briefly, and are then pushed upward and outward by new larvae arriving at the food. From above, this creates the appearance of a writhing fountain of insects. 

 This continuous flow prevents overcrowding and ensures that fresh larvae always have access to the food—boosting overall consumption rates dramatically. 

 📊 Solo vs. Group Feeding 

The study found that an individual larva only feeds around 44% of the time, taking frequent breaks. This limits their efficiency. However, in large groups—ranging from hundreds to tens of thousands—the group dynamics dramatically improve feeding performance. The larvae spontaneously rotate through feeding positions, without coordination, purely through physical movement and pressure. 

🧪 How Was This Studied? 

Researchers used video recordings and particle image velocimetry (PIV) to visualize and measure larval motion. They discovered a well-defined “mixing region” around the food where the larvae move with purpose: inflow from the bottom, outflow from the top. 

They also developed a mathematical model showing how feeding rates scale with group size. The model identifies three phases: slow increase (few larvae), optimal flow (moderate group size), and saturation (exceptionally large groups where surface area becomes the limiting factor). 

 🌍 Why Does This Matter? 

For BSF farmers and waste processors, this insight is highly practical.  

Finding the right balance between larval density and food surface area can help: 

• Maximize feed conversion rates. 

• Speed up food waste processing. 

• Use space and resources more efficiently. 

 Moreover, this behaviour is unique among scavengers. Unlike cows or fish, which compete or avoid each other, BSF larvae thrive on contact and work as a collective without hierarchy. 

🐛 What This Means for Insect School 

At Insect School, we do not just teach how to farm BSF—we also explore why they behave the way they do. Understanding the biology behind group behaviour helps us improve farming strategies and support a circular, sustainable future. 

📚 Want to learn more? 

Join one of our BSF farming courses or contact us for tailored, firsthand advice. 

Read the peer-reviewed study on how black soldier fly larvae form a fountain around food. Explore our BSF farming courses and resources for practical guidance.