The term "fingerling" refers to a young fish. Specifically, it refers to a fish that is at the juvenile stage of development and is typically around the size of a finger, hence the name "fingerling".
Fingerlings are usually between 1-4 inches in length and are smaller than adult fish. They are often raised in hatcheries before being released into rivers, lakes, or oceans as part of efforts to support and maintain fish populations.
Therefore, the correct answer to the question is: Fish.