Related to pit trophy and brick pool culture method

The pit and brick pool method is an effective technique for raising several species of earthworms, including *Lumbricus terrestris* (ring hair), *Eisenia fetida* (red wigglers), *Aporrectodea caliginosa* (labia genus), and *A. rosea* (ursinus genus). While some species like *Eisenia* can thrive on organic waste alone, others require a significant amount of soil to support their burrowing behavior. As a result, farmers often create pits or brick-lined pools in open areas or shaded spaces near homes. These structures are typically 50–60 cm deep, with the size depending on the scale of production—ranging from 2–3 square meters up to 10–20 square meters. To prepare the pit or pool, layers of fermented feed are added first. A base layer of 15–20 cm of organic material is placed at the bottom, followed by a 10 cm layer of soil. If there's a high number of worms, additional feed and topsoil are layered accordingly. Moisture levels are crucial: *Lumbricus* species prefer around 30% moisture, while *Eisenia* thrives between 25–30%, and *Aporrectodea* can tolerate lower humidity, usually 22–25%. Proper moisture helps maintain a healthy environment for worm growth and reproduction. In terms of density, about 2,000–3,000 worms per square meter can be raised, with each worm weighing approximately 5 grams. This results in a total biomass of 10–15 kg per square meter. Under optimal conditions, the maximum density can reach up to 8,000 worms per square meter, yielding around 30 kg of worms. This method is ideal for small-scale farmers looking to produce high-quality earthworms for composting, fishing bait, or even as a protein source in animal feed.

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