BELLE FOURCHE, S.D. (AP) — A Butte County couple is putting fish to work in a new aquaponic greenhouse, growing fresh, locally-grown lettuce that now lines Northern Hills grocery shelves.

He is a Black Hills and Wyoming native, she's from northeast Iowa, and together, Chris and Alexa Garro, owners of Garro Farms, have mastered the art of mimicking a natural ecosystem that combines traditional aquaculture with hydroculture in the ultimate symbiotic system.

It just so happens that the work fish naturally do, eating and producing waste, is the perfect fertilizer for growing plants. And boy do tho...