Finfish Breeding and Hatchery Management (2+1)

Unit 15 - Breeding of indigenous carps

15.5. Induced breeding

• P. sarana could be induced bred during southwest monsoon with intramuscular injection of ovatide at 0.05-0.1 ml per female and 0.03-0.05 ml per male.
• The injected brooders (1:2) are held in breeding hapa for spawning.
• About one kg of Hydrilla, and a few bundles of marginal grass are used as a substratum (egg collector).
• The interval between injection of hormone and spawning is about 8-10 hours at 26 - 27.5^oC.
• The eggs are small (0.9mm diameter) and transparent.
• Fertilization and hatching rates obtained are as high as 92.5 and 65%, respectively.
• The hatching and yolk-sac absorption periods are 15-20 hours and 3-4 days, respectively, at 25-30^oC.
• The length of one- day- old hatchling is 3.9 mm and that of the first to fifth-day-old is 3.87, 4.71, 6.20, 6.85 and 7.26, respectively.