Induced Breeding and Rearing of Common Carp (Cyprinus carpio) and Silver Carp (Hypophthalmichthys molitrix), at Mandal Fish Hatchery Farm, Rupandehi, Nepal

Abstract

Nepal has Several types of water resources and rich in indigenous fishes fauna of cold and warm water. However exotic species contribute significance in agriculture productions. Common carp and Silver carp are an exotic fish to Nepal. It was introduced from India in 1959 and Israel in 1960. The present work was carried for five months from February 2014 to July 2014 in Mandal Fishery Breeding Center (MFBC), Pathar Danda Rupandehi. It was started from 2057 BS. The present study was undertaken to study Physico-chemical parameters, biology of common and Silver carp - fecundity, gonadosomatic index (G.S.I), fertility rate, hatching rate, embryonic development and growth of

common carp and Silver carp (fry). In the period of study, the range of temperature of in

different ponds was 20-33 0 C, pH of water showed it to be alkaline during whole study period, dissolved oxygen and free CO 2 ware 5.8- 9.2 and 13.8-17.2 mg/l. The total number of eggs spawned was found to range from 2,50,000 – 4,60,000 and GSI 10% of female brood fish using ovaprim hormone and PG along with LRH. The fertility rate or rate of fertilization of eggs by milt was recorded 83 %. Out of total fertilized eggs, only 53.6 % of them were successfully hatched. Cleavage of egg was observed after 4 hr of fertilization. After 28 hr, eyed egg could be distinguished due to pigmentation and visible through the choroid. This stage was called Eyed Stage. The development of embryo could be noticed at 36 hr inside the egg. The development of embryo continued and the hatching takes place after 48 hours of fertilization. The length and weight of hatchlings was recorded gradually increasing. Hatchlings after transferring to the nursery pond, the fry were fed with artificially formulated feed with 45% protein at the rate of 5-10% body weight and the growth check-up was done at weekly intervals. Length and weight of fry was noted gradually increasing from first week to fourth week.