In a town near a big bay, the water was not healthy. It was brown and murky. The fish were getting sick, and the plants could not grow. The people in the town were worried about their bay.
A woman named Maria had an idea. She learned that oysters can clean the water. A single oyster can filter many gallons of water every day. Oysters are like little cleaners for the bay.
Maria asked other people in the town to help her. They collected old oyster shells from restaurants. They put the shells back into the bay. These shells give new, baby oysters a place to grow.
Soon, new oysters started to grow on the old shells. They began to clean the water. The bay started to look blue again. Maria and the people were happy they could help their home.