Fish farmer's glossary
fry, yearling, market fish, polyculture, winterkill, FCR — terms
Fish farmer's glossary
Fry:
Current-year young fish to 3–5 g; then yearling (to 50 g), two-year-old.
Market fish:
Sale-weight fish: carp 1.5–2.5 kg, silver carp 2–4 kg, trout 0.3–0.5 kg.
Polyculture:
Co-culturing species with different feeding niches: carp + silver carp + grass carp.
FCR:
Feed Conversion Ratio — kg feed per kg gain; carp 1.5–2, trout 1–1.2; lower is better.
Winterkill:
Mass fish death from oxygen deficit — under ice in winter or at night in summer.
Stocking:
Placing fish into a water body; density per norm for species and feed base.
Harvest:
Catching market fish in autumn before wintering; unharvested remainder winters.
Spawning:
Reproduction; carp needs soft vegetation or nests, 18–20°C.
Technology card:
Pond passport: area, depths, soils, water supply, feed base.
Wintering pond:
Deep part (2–3 m) where fish winter; a separate wintering pond is better.