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It is best not to assume that such high efficiency is possible in every case. In an article titled “Crickets are not a free lunch,” authors Lundy and Parrella (2015) point out that crickets’ growth and even viability depends on the quality of their diet, especially at an industrial scale. Still, a company called Agriprotein, raising black soldier fly larvae as a protein source for animal food, harvests six and a half tons of MagMeal (ground and dried larvae) from 100 tons of organic waste (Thomas 2017a). Considering that the six and a half tons are dry weight and that the company sources the organic food waste for free, it is a pretty good ratio.

Insects for Food and Feed, EDN #137