Induced Breeding and Rearing of Common Carp (Cyprinus carpio) and Silver Carp (Hypophthalmichthys molitrix), at Mandal Fish Hatchery Farm, Rupandehi, Nepal
Date
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Department of Zoology
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.