Induced Breeding and Rearing of Silver carp by using LHRH-a Hormone at Fish Development and Training Centre Janakpurdham, Nepal

Abstract

The present study was undertaken to study “Induced Breeding and Rearing of Silver carp by using LHRH-a hormone at Fish Development and Training Centre Janakpurdham, Nepal” .The present field study was carried out for 4 months from May 2019 to August 2019 to study the physico-chemical parameters, Biology of Silver carp-Fecundity, Gonado somatic index (G.S.I), Fertility rate, Hatching rate, embryonic development and growth of Silver carp (fingerlings).Silver carp were spawned successfully in following two successive doses of LHRH-a. Initial dose for female is 2µg/kg and second dose 4µg/kg. For a male single dose is given at time of second dose for female 3µg/kg of the body weight. Latency period ranged between 810 hrs. During the study period the range of temperature in different ponds was 24360C,PH of water showed it to be alkaline during the whole study period, Dissolved oxygen were recorded 5.0-8.2 mg/l,Co were recorded 13-17.1mg/l. The total number of egg spawned was found ranged from 324,996 to 606800, fertility rate (72.592.5%), G.S.I (16.21-24.44%) and hatching rate (65.21-82.60%) in Silver carp. The development of embryo was noted from three hours on wards. The development of embryo was continued and hatching takes place between 18 to 20 hrs. After five days hatching are transferred in the Nursery ponds, the fry were fed with artificial formulated feed with35- 40% feed regularly. The length and weight of hatchlings was recorded at weekly intervals. Length and weight of fry was noted gradually increasing from first week to fourth week.