A Different Angle

9 . Fifth-graders gathered around a large tank inside their school’s greenhouse. Plants hang overhead, and trays of seedlings (幼苗) fill the shelves. Small silver fish pop their heads out of the water as Blanka, 10 years old, holds out food. “If you put your finger in a little bit, they might bite it. It doesn’t hurt; it just feels funny,” explains Blanka.

At Manzo Elementary Schools in Tucson, raising fish at school was one small answer to a big problem faced by many people in the neighborhood — food insecurity. While the students could have breakfast and lunch at school, their families often struggled to provide dinner. The teachers came up with an idea: could the students raise food at school for the neighborhood?

It wouldn’t be easy. Being in a desert region, water was a scarce resource in Tucson. Apart from that, the soil doesn’t always have the nutrients plants need to grow, so the students would need to add a natural fertilizer. Inspired by the Aztecs’ ancient practice of chinampas, floating farms on lakes near Mexico City, Counselor Moses Thompson introduced an aquaponics (鱼菜共生) system where fish waste served as fertilizer for the plants, while the plants’ roots purified the water in the fish tank. Apart from fish, other animals played an important part in supporting the students’ mission to feed their neighbors. Chickens laid eggs, and visiting pollinators (传粉者) like bees and butterflies helped transform flowers into vegetables.

Once the students had harvested enough food, it was time for Market Day. They offered vegetables as donations to people in the neighborhood and sold eggs and fish to raise funds for fish food and chicken feed. “We can plant good food and have fun while we’re doing something important,” says Blanka. “I’m so happy to be at this school.”