A practical guide to Lucilia sericata (blowfly larvae)
Maggots are a simple but powerful teaching resource, widely used in biology classrooms and laboratories. Whether you are planning a life cycle investigation or a behaviour experiment, this guide answers the most frequently asked questions about blowfly maggots and explains how to use them effectively in schools.
What species are the maggots supplied for educational use?
The maggots supplied are Lucilia sericata, commonly known as the green bottle fly. This species is particularly well suited to teaching because its life cycle is well understood, it develops quickly, and its behaviour is easy to observe. It is also widely referenced in both biological and forensic science, making it highly relevant for curriculum-linked learning.
What stage are the maggots when they arrive?
Maggots are provided at the final larval stage, just before pupation. At this point in their development, they are large enough to handle and observe clearly, and they are close to undergoing metamorphosis. This stage is ideal in a teaching context because it allows students to witness the transition from larva to pupa within a relatively short timeframe, making it possible to plan structured lessons or short investigative projects.
How long will the maggots remain as larvae?
If stored correctly, the maggots are guaranteed to remain in the larval stage for at least one week after receipt. Their rate of development depends largely on temperature, which means that careful storage can significantly extend their usable lifespan. This predictable window gives teachers and technicians enough flexibility to incorporate them into planned lessons without the risk of premature pupation.
How should maggots be stored?
To slow development and delay pupation, maggots should be kept in a refrigerator at around 4°C. Cooling reduces their metabolic activity, effectively pausing their development. They should be stored in a ventilated container and handled as little as possible between temperature changes. Removing them from the fridge for lessons is perfectly fine, but extended periods at room temperature will accelerate their progression to the pupal stage. Returning unused maggots to the fridge promptly will help maintain their condition for future use.
Maggots can be used at room temperature during lessons and practical activities, but it is important to understand that this will speed up their development. If left out for too long, they may begin to pupate sooner than expected. For best results, only take out what is needed for each activity and return the remainder to the fridge as soon as possible.
What happens as maggots develop into flies?
Maggots undergo complete metamorphosis, a process that includes four distinct stages: egg, larva, pupa, and adult. In the classroom, students typically observe the larval stage followed by the formation of the pupa. As the maggot prepares to pupate, it becomes less active and forms a hardened outer case called a puparium. Inside this case, it transforms into an adult fly, which will eventually emerge if development is allowed to continue.
Are maggots safe to handle in school settings?
Yes, blowfly maggots are safe for use in classrooms and laboratories when basic hygiene practices are followed. Students should wash their hands after handling them, and tools such as forceps or spoons can be used to minimise direct contact. As with all live organisms, they should be kept contained and handled responsibly, but they are considered a low-risk and widely accepted teaching resource.
How should maggots be disposed of?
When maggots are no longer needed, they should be disposed of humanely by placing them in a freezer for at least 72 hours. This ensures that they do not continue developing into pupae or adult flies. After freezing, they can be disposed of in your general waste. Alternatively, maggots can be fed to chickens as a tasty snack!
How do maggots support the biology curriculum?
Maggots provide a highly effective way to meet key biology curriculum objectives across multiple levels of study. They are particularly valuable in topics that explore animal behaviour, responses to environmental stimuli, life cycles, and experimental design. Their use supports “working scientifically” by giving students the opportunity to plan investigations, control variables, collect and analyse data, and draw conclusions based on evidence. Because their responses are visible and relatively fast, they are especially useful for practical, time-limited lessons. They also help bring abstract concepts to life. Instead of simply learning about behaviour or adaptation in theory, students can directly observe how an organism interacts with its environment.
How are maggots used for behaviour studies?
One of the most common classroom applications is the choice chamber experiment, where students investigate how organisms respond to different environmental conditions. In this practical, maggots are placed into a chamber that offers contrasting conditions, such as light versus dark or damp versus dry environments. Over time, students observe how the maggots distribute themselves between the two areas and record their results. This experiment allows students to explore behavioural responses such as movement toward or away from stimuli, while also practising key scientific skills such as identifying variables, ensuring fair testing, and interpreting data.
Maggots typically show clear and consistent responses. They tend to avoid light, a behaviour known as negative phototaxis, and favour moist conditions, known as positive hygrotaxis. These responses are linked to survival, as darker, damp environments reduce the risk of predation and dehydration. Because these behaviours are reliable and observable within a short period, they make maggots particularly well suited to classroom investigation.
Why are maggots a good choice for teaching?
Maggots are practical, reliable, and engaging. They are large enough to be seen easily without specialist equipment, and their behaviour is quick enough to produce meaningful results within a single lesson. They also connect strongly to real-world science, from ecology to forensic investigations, helping students understand the relevance of what they are studying. For teachers and technicians, they offer a straightforward, low-maintenance resource that can support a wide range of biological concepts.
Final tips for successful use
Planning ahead is key to getting the most from maggots in the classroom. Ordering them close to when they are needed, storing them at the correct temperature, and monitoring their development will ensure they remain in the best condition for teaching. When ordering you can provide order notes as to when you need them for, we can then delay sending until just before your practical. During term time we always have stock, during school holidays there may be a delay dispatching.
With careful handling and thoughtful integration into lessons, maggots can provide a memorable and cost-effective way to explore biology in action.
