MRP: Optimising rearing conditions for black solider flies – Julian Beniers

Julian Beniers is a man with a mission. Before he even applied for the MSc course, he had formulated his Master’s Research Project (MRP), methods and all. During his BSc at HAS University of Applied Sciences, he started a project on black solider flies (Hermetia illucens) and became interested in their biology and behaviour. He then furthered this interest when doing an internship with the same species before coming to Harper Adams University (twitter: @HarperAdamsUni). By the time he arrived in Shropshire, his MRP was complete in all but execution.

Julian will be investigating the effect of protein and carbohydrate levels in black solider fly larvae foods and its relation to larval mass over the course of larval development, and potentially macronutrient levels within the larvae too (time permitting). He wants to answer the question “When do black soldier fly larvae begin producing large fat reserves, and specifically, at what weight does this normally occur?”. Black solider fly larvae rapidly become larger during their first instars and protein is likely to the most important macronutrient of their diet, whereas later in larval development, carbohydrates and fats may become more important. To answer his research question, Julian will attempt to map protein and fat content of larvae at precise intervals throughout their development by killing, drying and subjecting the dried tissue to Soxhlet and leco fat and protein analysis, respectively. He’ll also be using a variety of different foods with varying levels of protein and carbohydrate to see if these can be used to determine an optimal diet and growth rate. He suspects the larval mass at which a change in macronutrient storage occurs in between 140-160 mg.

This research is potentially quite commercially important because of the widespread use of black soldier fly larvae in the pet trade (food for exotic pets) and in human entomophagy (food for us). Interestingly, Julian gently suggests that this research may actually have been done before internally within pet food companies, however, as the Robin Hood of trade secrets, Julian attempts to get this research published, which could make things easier for other companies and independent rearers.

More generally, Julian is an avid keeper of entomofauna and is curious about the upcoming entomophagy industry in the West (an age-old industry in other parts of the world); he is planning to attend the Royal Entomological Society’s entomophagy day on April 4th.

Please don’t hesitate to contact me (details below) or Julian with advice or questions (twitter: @Julianosaurus; email:; LinkedIn).


Featured photo: Black solider fly larvae – photographed by Julian Beniers, of course!

Blog written by Max Tercel (email:; twitter: @MaximumInsect).






Master’s Research Projects: gut analysis of coprophagous dipteran larvae – Alex Dye

The first in a series of posts detailing some of the Master’s Research Projects (MRPs) being undertaken here at Harper Adams University features the dipterist, head our MSc twitter page, and all-round good guy, Alex Dye! Continue reading

Insect flight – an evolutionary development that shaped the world

Flying animals have had a major impact on nonflying organisms. Briefly consider the ecological and evolutionary interrelationships between pollinators and flowers, or between mosquitoes, the parasites they transmit and humans. Even a cursory glance at the manifold relationships flying insects have with all other forms of terrestrial life evaporates any doubt whether the world would be a very different place if they had never evolved.

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Parenting for Dummies (feat. burying beetles)

Festive greetings readership,

On a gloomy, mist-filled night, the life of a mouse is gently extinguished by disease. Its blood stills, its body cools, and a slight wind carries its almost imperceptible scent through the air. A faint buzzing approaches from the darkness, growing louder and louder; a flash of jet-black and red in the moonlight. Another. Then… silence. Two beetles scamper onto the carcass after their nightly flights. They are burying beetles, a male and a female, and have much to do over the next 2-3 weeks. Continue reading

Night takes Queen: where do all the wasps go in winter?

Season’s greetings readership,

As I type, millions of Vespula vulgaris (‘common wasp’) queens are in a deep slumber within dead logs, sheds, attic spaces, burrows, and innumerable other areas out of the British elements. Because all other members of a wasp colony die over winter, the survival of the queen is vital to regenerate populations in the spring and summer. But this process is far from simple, incorporating physiological and behavioural adaptations that must be timed accurately to prevent freezing, parasitism, predation,and starvation. The journey of a queen wasp is quite an incredible one involving death, opposition, sex, family, altruism, resurrection, and prejudice, and I would like to personally recommend it as a superior alternative to the biblical prose to which we are flooded at this time of year. Continue reading

How do bumblebees fly?

Greetings readership,

The flight of the bumblebee is not only an excellent classical piece composed by Rimsky-Korsakov, but also the subject of another ‘fact’ about insects, which usually goes something like: “According to the laws of physics, bumblebees shouldn’t be able to fly.” or a phrase of similar meaning. Indeed, the violation of the observably consistent Newtonian Laws of Motion by bumblebees and only bumblebees is not a very strong position to hold and might suggest the advocate of this belief should more fully examine how bumblebees generate lift. I shall try to provide such an examination. But first, let us delve into insect flight more generally!


A bumblebee ‘defying the laws of physics’

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If a flea were the size of a human could it really jump over the Eiffel Tower?

Greetings readership.

Quite a lengthy one for you this time.

The ‘well-known fact’ that If a flea were the size of a human, it could jump over the Eiffel Tower is an interesting misconception – one that disregards laws of scaling and structural engineering. A brief analysis of the claim can reveal some of its substantial flaws. But before we go any further, let’s use our imaginations, if only as a preliminary thought-experiment.

Picture a human-sized flea (let’s say about 170cm in length), henceforth named ‘enormo-flea’. It has the exact same proportions as an ordinary flea, but happens to be 170cm long.

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