Fingerlings
fingerling quality assessment: size, uniformity, activity, origin, transport
Fingerlings
Size groups:
Larva → fry (3–5 g) → yearling (25–50 g) → two-year-old — price and survival depend on category.
Uniformity:
The batch must be same-sized — mixed sizes mean cannibalism and losses.
Activity:
Healthy fry is active, schools together, reacts to noise; lethargic/side-swimming is a reject.
Appearance:
No abrasions, spots, visible parasites; intact fins; shiny scales.
Origin:
Buy from a fish farm with vet documents — hand-bought fry carries diseases and unknown species.
Transport:
Polyethylene + oxygen or live-fish tank; >4 h only with oxygen; temperature shock kills.
Acclimatization:
Equalize water temperature before release (15–20 min) — a >3°C difference is lethal stress.
Stocking norms:
Carp 800–1500/ha, silver carp 150–300, grass carp 100–200 — by natural feed base.