Blog & Resources

Practical farming know-how, written for Sierra Leone

Short, plain-language guides on the things farmers ask us about most — livestock, turning waste into feed, mushrooms, fish farming and farming that stands up to a changing climate.

Poultry Waste to feed Mushrooms Climate-smart
Featured guide

Turning farm waste into protein: a beginner’s guide to Black Soldier Fly

Waste to feed 6 min read Practical guide

Black soldier fly larvae eat the organic waste your farm and market already produce, and turn it into a feed ingredient rich in protein. This guide walks through what the insects need, how the life cycle works, how to feed the larvae to poultry and pigs safely, and how to deal with the problems that put most beginners off.

Read the guide
Black soldier fly larvae feeding on organic waste in a rearing tray

Latest guides

Start with the topic that is on your mind

Each guide is written by our team from the work we do on farms, at training sessions and on site visits. Read the short version here, then open the full guide in the library below.

Guide library

Read the full guides

These are complete guides rather than summaries. Open one to read it here, or share the page with a group you work with.

Black soldier fly larvae are the young stage of a fly that occurs naturally in warm, humid places. What makes them valuable on a farm is their appetite. Give them organic waste — market leftovers, kitchen scraps, spoiled fruit and vegetable matter — and they turn it into their own bodies, which are rich in protein and fat. Waste that would otherwise sit in a drain or a rubbish heap becomes a feed ingredient you produce yourself, and money that would have gone on bought feed stays with you.

How the life cycle works

The adult fly is a slender, dark insect that does not bite or sting. Adults lay clusters of eggs near moist, decaying material, and the eggs hatch into small larvae. The larvae do the work: they eat almost continuously and grow quickly. When they are fully grown they are plump, pale and easy to see, and that is the stage you harvest.

Keep part of each harvest back and let it pupate — the resting stage. From the pupae, new adults emerge to lay the next batch of eggs, so one starter colony keeps producing as long as you look after it.

What you need before you start

Have these in place before you build anything, because the larvae will need feeding every day.

  • A shaded, sheltered area, out of heavy rain and direct sun.
  • Shallow containers or crates that are easy to lift, drain and clean.
  • A starter colony of larvae or pupae from someone already rearing them.
  • A reliable supply of organic waste, such as market or kitchen waste.
  • Clean water, and somewhere to wash your hands and tools afterwards.

Feeding larvae to poultry and pigs safely

Larvae are a supplement, and they should be introduced the way you would introduce any new feed.

  • Start with small amounts and watch how the animals respond.
  • Offer them alongside the normal feed rather than instead of it, so the ration stays balanced.
  • Use them fresh quickly, or dry them so they store for longer.
  • Keep the unit clean and away from the feed store, kitchen and drinking water.
  • Never feed larvae that smell bad, or that came from waste you would not want near your animals.

Common problems and how to manage them

  • Too much moisture. The bedding turns soggy and starts to smell. Add dry material and use less very wet waste.
  • Smell. Usually a sign of overfeeding or poor drainage. Feed less, feed more often, and clear what the larvae have not finished.
  • Ants and other predators. Stand the legs of the unit in shallow dishes of water or oil, and keep the ground around it clean.
  • Overheating. Direct sun can kill larvae quickly. Keep the unit shaded and ventilated through the hot part of the day.
  • Overfeeding waste. Match what you add to what the larvae can finish, because extra waste attracts flies and pests.

Key takeaway: start small. One modest unit you feed and check daily will teach you more than a large one you cannot keep up with.

There is an environmental gain here too. Every bucket of organic waste that goes into a rearing unit is a bucket that does not end up in a gutter, a drain or a dump, where it would breed flies, smell and wash into waterways when it rains. Rearing black soldier fly is therefore both a farm business decision and a small act of environmental care. If you would like help planning a unit, or training for a group, our team is glad to advise.

Stay in touch

Get advice in your inbox

No automated system and no mailing list software — just a short, practical tip now and then, sent by a person.

Learn with us instead

If you would rather learn hands-on, our training programmes cover livestock, black soldier fly production, mushroom growing, fish farming and farm business management. Groups and institutions are welcome, and we can plan a programme around what your members actually need.

Have a question our guides don’t answer?

Tell us about your farm, your group or your project and we will point you in the right direction — no obligation, and no jargon.