| dc.description.abstract | The reba carp, Cirrhinus reba locally known as Khorkia or Bhagna/Tatkini belongs to
the cyprinidae family. Recently the fish is considered as “Near Threatened” categories by
IUCN- Bangladesh. By considering its threatened situation and aquaculture
potentialities, initiatives were taken to domesticate the wild stock in captivity, and
induced breeding through hypophysation. Live C. reba were collected from three rivers
of Dinajpur district and reared in two different ponds of Freshwater Sub-station,
Bangladesh Fisheries Research Institute (BFRI), Saidpur and in the pond of Hajee
Mohammad Danesh Science and Technology University (HSTU) campus. In all the
ponds, locally available commercial fish feed having 20% proteins were provided in
every pond at 5-6% body weight of fish at 9.00 am and 5.00 pm was provided. Along
with the length and weight data, the water quality parameters such as pH, DO,
temperature etc. were recorded during domestication of the fish. The growth of C. reba
in captivity was compared with the wild stocks through a length-weight relationships
analysis by including a total of 120 C. reba individuals, among them 60 were wild and
60 were pond rearing. Subsequently three treatments having different dosages of carp
pituitary gland extract, flash and ovatide were used for induced breeding of C. reba. In
each breeding trial 12 males and 6 females were used. The result of domestication of C.
reba in captive condition showed moderate growth and survival rate. The comparison of
length-weight relationship between domesticated and wild stocks of C. reba showed
allometirc growth pattern. The ‘b’ value for C. reba also was 3.17 and 2.738 for wild and
domesticated fish respectively. The coefficient of determination (R2
) was 0.96 for wild
and 0.91 for wild and domesticated fish respectively. The fish ovulated with the
hormonal injection of pituitary gland extracts only and did not respond to flash and
ovatide. The ovulation, fertilization and hatching rate were found 78%, 34.22% and
45.12% in the initial study. The results of this study showed the potential of seeds
production of this fish through hypophysation. Further details study is highly recommend
for producing the seed in large scale. The seed production could be the effective means
of revival from the being extinction by restoration as well as incorporation of this species
in aquaculture of Bangladesh. | en_US |
