Fingerlings refer to the young of fish. They are small, juvenile fish that are typically between the size of a fry and a juvenile fish. Fingerlings are commonly used in aquaculture, which is the farming of fish and other aquatic organisms. They are raised in hatcheries and then stocked in ponds or other bodies of water where they are raised to maturity. Some common fish species that are raised as fingerlings include tilapia, catfish, trout, and salmon. Fingerlings are important for the aquaculture industry as they provide a sustainable source of fish for human consumption.