In much of East Africa, small-scale fish farming seems easy enough on paper, but it keeps hitting the same wall: the cost of feeding the fish. In Tanzania, feed alone can account for around seventy percent of the expenditures of running a small farm, and much of that feed relies on either imported soybean or fishmeal manufactured from wild-caught fish, both of which come with hefty price tags and environmental impacts of their own. But for Diana Orembe, a biologist working in Dar es Salaam, the imbalance seemed less like an inevitable aspect of the industry and more like a problem waiting for the proper kind of microbe.
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