Insect Farming --- Crickets, Mealworms, and Black Soldier Flies

Entomophagy — the practice of eating insects — is not exotic. Approximately two billion people across Asia, Africa, and Latin America eat insects regularly and have done so for thousands of years. The framing of insects as "alternative protein" is a Western cultural artifact, not a global consensus. What is relatively new is the formal application of insect biology to structured farming at household and industrial scales, with attention to yield optimization, hygiene, and integration with other food systems.

At the household level, insect farming is genuinely low-barrier to entry. The infrastructure is minimal, the biology is fast-cycling, and the integration potential with existing poultry or fish systems is immediate. Here is a deeper technical treatment of each of the three primary species.

Black Soldier Fly (Hermetia illucens)

BSF is arguably the most important insect in the current food sovereignty toolkit. The arguments for it:

Waste conversion capacity. BSF larvae can process effectively any organic waste: fruit and vegetable scraps, cooked meat, fish offal, coffee grounds, manure from cattle, poultry, or swine, spent grain from brewing, pulp from juicing. They cannot process wood, plastic, or high-salt materials. Their pH tolerance is wide. Their enzymatic capacity is extraordinary.

Protein and fat content. Dried BSF prepupae are typically 40–44% protein and 28–36% fat by dry weight. The fat profile is unusual — high in lauric acid, a medium-chain saturated fat with demonstrated antimicrobial properties. This means BSF larvae not only feed the animals that consume them but may provide some pathogen suppression in the gut of those animals. Studies have shown reduced Salmonella prevalence in chickens fed BSF larvae.

Self-harvesting biology. Mature BSF prepupae seek dryness instinctively before pupating. A ramp or trough positioned above the main bin captures them as they crawl out. This eliminates the labor-intensive hand sorting required for crickets or mealworms. A well-designed bin runs with almost no labor once the colony is producing.

No pest attraction. The odor profile of an active BSF bin actually repels house flies. The larvae outcompete house fly larvae for resources, and the presence of the colony appears to suppress house fly populations in the surrounding area. A properly managed BSF bin does not smell — the larvae consume material faster than it can putrefy.

Setting up a BSF system: A basic setup uses a 5–10 gallon container with a loose lid (ventilation without escape), a feeding layer of carbon material (corrugated cardboard, dried leaves) at the bottom, and an exit ramp made from corrugated plastic or wood positioned so prepupae crawling up will fall into a collection container below. Seed the bin with either purchased BSF eggs, purchased young larvae, or allow wild colonization if you are in a warm climate (female BSF are attracted to fermenting organic material and will lay eggs naturally).

Temperature management is the primary challenge in cold climates. Below 60°F, larvae become inactive and feeding essentially stops. Above 95°F, heat stress increases. A greenhouse, south-facing building cavity, or insulated interior space solves this in temperate climates. In truly cold climates, BSF is a seasonal system unless you have heated space.

Mealworms (Tenebrio molitor)

Mealworm farming is suited to people who want a low-drama, low-odor, low-noise protein production system that can live in a closet or under a shelf. The full lifecycle includes egg, larva (the "mealworm" stage), pupa, and adult beetle, cycling roughly every three to five months under good conditions.

Infrastructure: stackable plastic bins or trays, 2–4 inches deep. Substrate is wheat bran — cheap, available in bulk, stored dry. Larvae and adults eat the bran and require a moisture source: carrot slices, apple cores, potato pieces. Replace moisture sources every few days to prevent mold.

Management sequence: 1. Start with purchased mealworms or adult beetles 2. Adults lay eggs in the bran substrate; eggs are tiny and invisible — just leave them 3. After two weeks, small larvae are visible 4. Larvae grow over eight to ten weeks, molting repeatedly 5. Larvae pupate (non-feeding pupal stage, two weeks) 6. Beetles emerge from pupae, mate, and lay more eggs 7. Separate larvae from beetles to prevent beetles from eating larvae

Harvest is done by separating larvae from substrate using a sifting screen. They are fed fresh to poultry or fish, or dried for storage. Dried mealworms have a shelf life of several months at room temperature.

Scaling mealworm production is linear: more trays, more production. A system of fifteen to twenty trays running in rotation can produce meaningful quantities continuously.

Crickets (Acheta domesticus and Gryllus bimaculatus)

Cricket farming has the highest protein return per square foot of any of the three species but also the highest management intensity. Crickets are fragile — they die rapidly from moisture, temperature swings, overcrowding stress, and even certain gut-loading materials. They are also loud and escape readily. These are real operational considerations, not minor inconveniences.

Cricket-specific requirements: - Temperature maintained at 80–90°F consistently (this alone eliminates casual setups in cold rooms) - Low humidity (high humidity causes mold and bacterial growth that kills crickets rapidly) - Hiding structure: egg carton stacks packed vertically fill the space and give crickets surface area to cling to — without this, they will climb and crush each other - Water via a saturated sponge, hydrogel crystals, or vegetable pieces; never open water - Food: dry grain mix (chicken feed is acceptable) plus vegetable matter for nutrients

The cricket life cycle runs about eight weeks from egg to harvest. Eggs laid in moist soil or a substrate layer hatch in two weeks; nymphs grow through six instars to adulthood in another six weeks. Harvest just before full adulthood for highest protein ratio.

Cricket frass (their excrement and shed molts) is an excellent slow-release fertilizer, richer in chitin than most organic amendments. Chitin is a plant immune stimulant — it signals to plants that insect attack is occurring, priming their defense pathways. Cricket frass applied to garden beds shows measurable benefits in multiple studies.

Human Consumption: Nutritional Context

Insect protein is complete protein — all essential amino acids are present. Cricket flour is approximately sixty-five percent protein by dry weight and contains significant iron, calcium, and vitamin B12. The bioavailability of insect protein is high, comparable to meat sources. The fiber content, from chitin in the exoskeleton, is functionally similar to dietary fiber and supports gut microbiome diversity.

The primary barrier to insect consumption in Western cultures is psychological rather than physiological. Processing insects into flour or incorporating them into familiar food formats (protein bars, pasta, baked goods) substantially reduces resistance. Roasted insects with seasoning are accepted more readily as a snack format than whole cooked insects mixed into dishes.

If you are raising insects for livestock feed, human consumption is a separate conversation. If you are raising them as a protein source for household consumption, start by incorporating cricket flour into baked goods and energy bars where the texture is undetectable. The nutritional outcome is real regardless of the format.

Systems Integration

The full efficiency gain from insect farming comes from integration, not isolation. Consider this loop:

Kitchen scraps → BSF larvae → fed to laying hens → eggs for household + chicken manure → fed to BSF or composted → applied to vegetable garden → vegetable scraps → back to BSF

Each stage converts a waste stream into a resource. Nothing leaves as pure waste. The system is not a linear production chain but a closed cycle, and the insect stage is what makes closure possible — because insects can process materials (meat, dairy, manure) that other composting systems reject.

This is the core insight: insect farming is not just "alternative protein." It is a biological closure mechanism that makes other parts of your food system more efficient. An integrated system with insects produces more food with fewer external inputs than one without.

The knowledge barrier is real but surmountable. BSF is the best starting point — start one bin, observe it for a season, and let the biology teach you. The system rewards attention more than intervention. That is a useful quality in a food production method that must compete with everything else demanding your time.