Finfish Breeding and Hatchery Management

Unit 8 - Breeding of trouts

8.6. Fry rearing

• Fry are traditionally reared in fiberglass concrete tanks (circular ones preferred).
• Diameter of circular tank is 2 m or size of squarish tank is 2 m x 2 m, with 50-60 cm depth.
• The drain is fixed in the centre of the tank and is protected by a mesh screen.
• Fry are fed with specially prepared starter feeds using automatic feeders.
• Feeding rate is 10% b.w. daily for 2-3 weeks using continuous feeders
• Feed pellets contain fish meal (80%), fish oil and grains.
• Feed contains proteins (50%), fat (12-15%) and vitamins (A, D and E), minerals and pigments (astaxanthin and canthaxanthin).
  

Water quality requirements

DO : near saturation

CO₂ : < 2 ppm

Temperature : 12-21⁰C

pH : 6.5-8.5

Alkalinity : 10-400 ppm (as CaCO₃)