Fish in the Rice Field: A Simple Solution Fighting Disease and Hunger

Schistosomiasis sounds like a disease from another era, yet it silently affects more than 220 million people today—mostly in sub-Saharan Africa. The parasitic infection spreads through freshwater snails that thrive in the standing water of rice paddies, turning what should be a livelihood into a health hazard for farmers and their families. But researchers from the University of Notre Dame have discovered something elegant: you don’t need new technology or expensive interventions to break the cycle. You just need fish.

A new study published in Nature Sustainability reveals that adding two native fish species—African Bonytongue and Nile tilapia—to rice fields in Senegal dramatically reduces the snail populations that harbor the parasite. The fish don’t need to be fed; they naturally thrive by eating snails or competing with them for resources. Lead researcher Emily Selland and her team, led by Jason Rohr a professor of biological sciences at the University of Notre Dame, tested this approach across more than 400 households in rural Senegal and found something remarkable: this simple addition doesn’t just cut disease transmission. It transforms the entire farming equation.

The results read like a case study in sustainable development done right. Rice yields jumped by more than 25 percent. Soil nutrients improved. And farmers gained a secondary income stream from harvesting the fish themselves. These aren’t marginal gains—they’re the kind of multiplier effects that can reshape rural economies. Children of rice farmers in the studied region showed higher disease prevalence than their peers, indicating just how acute the schistosomiasis problem is for agricultural families. A drug exists to treat the disease, but it can’t prevent reinfection, meaning families caught in farming face an endless cycle of illness and poverty.

What makes this solution genuinely compelling is that it sidesteps the false choice between health, food security, and environmental stewardship. Rohr described it plainly:“Those kinds of win-win-win solutions are rare, but they are exactly what sustainable development requires.”The approach isn’t new—rice-fish coculturing exists in other regions—but applying it to infectious disease control represents a conceptual shift. You’re not fighting the disease with pharmaceuticals alone; you’re redesigning the ecosystem to make transmission less likely in the first place.

Researchers are already exploring how to scale this across other schistosomiasis-endemic rice-growing regions. If the results hold, rice-fish coculturing could become a model for addressing interconnected challenges—disease, food production, poverty—simultaneously rather than treating them as separate problems requiring separate solutions. For communities along the northern Senegal River basin, it’s not just agriculture innovation. It’s a pathway out of a disease trap that’s persisted for decades despite decades of drug campaigns.