Breeding and fingerling production of common carp (Cyprinus carpio) in coldwater region with water optimization

An experiment was conducted to breeding and fingerling production of Common carp in recirculatory system for water optimization from May to July, 2019 in fish hatchery of ICAR-DCFR, Bhimtal, Uttarakhand. The recirculatory system with triplicates was used. The system comprised the FRP tank having dimension 1.5×1.0×1.0m for breeding and rearing of common carp. Two females and four males brooder were stocked in each recirculatory system. After seven days Ovatide hormone was given at 0.3ml/kg for female and 0.1ml/kg for male intramuscularly in a single dose. Hydrilla was spread over the tank. After 10 hr, females and males oozed eggs and milts, respectively and hatching started after 72 hr. All hatchlings were kept in the same tank. Yolk sac was absorbed after 76 hr. Daily 10percentof water was exchanged in the morning and evening. Fertilization and hatching rate percentage were 79.93 and 59.79, respectively. The survival rate of hatchlings to yolk sac absorption stage was 53.56percent. The survival rate of fingerlings after 90d was 81.11percent. Water quality parameters viz.,average temperature, pH, DO, Free CO₂, Alkalinity, Hardness and Ammonia -nitrogen were 20.2°C, 7.45, 7.29 mg/l, 4.11 mg/l, 97.64 mg/ l, 198.25 mg/ l and 0.068 mg/l, respectively. Common carp culture is popular in India but a shortage of water is foremost constraint for seed production. The dependence of water in seed production can be decreased by water optimizing with recirculatory system for seed production. The water recirculatory system may help to reduce water footprint in seed production of common carp.