People raise earth worms in order to feed fish, ducks, eel or chicken… Worms are fed with cowpat, kitchen waste and tree leaves. Earth worms also make good fertilizer out of cowpat. After collecting the worms this vermi-compost can be used to improve crop production. Some water can be extracted from the worm compost and used as fertilizer at the bottom of fruit trees for example. Anh Dương helps by providing free training of this technique for farmers.