The fish pond has been stocked with fingerlings. The pond has been filled with water and it has been fertilized, the water has become green enough to take fingerlings.
Fingerling fish go through various stages between birth and adulthood. They start as eggs which hatch into larvae. When they have developed scales and working fins. The transition to a juvenile fish is complete and it is called a fingerling. Fingerlings are typically about the size of fingers. The juvenile stage lasts until the fish is fully grown, sexually mature and interacting with other adult fish.