Fingerling
A young fish about the length of a finger, the size at which farms stock ponds and hatcheries release fish into rivers.
Also: juvenile
A fingerling is a young fish a few centimetres long, roughly the length of a finger. In Indian carp farming, fingerlings of 8 to 10 cm or more are stocked into grow-out ponds because they survive far better than fry. Restocking projects for mahseer and other river fish also release fingerlings, and many states run river ranching schemes in which hatchery fingerlings are put into rivers and reservoirs. In salmon, the stages between fry and smolt are called parr.