| dc.description.abstract | Cirrhinus reba, locally known as Bhangna, belongs to the Cyprinidae family, is one of
the most popular minor carp species, which were abundantly available in the past. This
fish is distributed in South-East Asian countries including Bangladesh. Now a days it
has become endemic in some selected regions of Bangladesh such as Dinajpur, Bagura,
Jashore, Mymensingh and Sylhet. Hence, in attempts were taken to this study know the
present status of wild C. reba in Dinajpur, Bagura, Jashore and Mymensingh through
length-weight relationship, condition factor and geometric morphometric analysis.
Samples of wild C. reba were collected from the selected regions and carried to the
laboratory in ice condition. The total length and weight of each individual samples were
taken in nearest cm and gm respectively. Then the images of each sample were
captured by Canon Power shot SX510 HS Digital Camera (4000 X 3000 megapixels).
The length weight data were analyzed in PAST software (version 3.0) for determining
the slope b, condition factor k and correlation coefficient r2
. The images of each sample
were converted in TPS file format using tps util software (version 1.74). Then the tps
file were converted to landmark coordinated file using tps Dig2 (version 2.29) software.
Finally the data were analyzed using PAST software to discriminate the wild stocks
through Eigenvalue, percent variance and scatter plot. The overall b value ranged from
1.22 to 4.69 where the lowest (1.22) was found in the Jamuna river sotck and followed
by Bhramaputra river (3.07), Bergobindapur baor (4.44) and Atrai river (4.69). A total
of 22 principal components were identified in the shape analysis among the four
different regional stocks highest value fish than the lowest values of one another, where
the highest Eigenvalue (553078) and Percent Variance (45.478%) for total populations
were found on the PC-1. In overall geometric analysis, variation of four wild stocks
were observed with lower demarcation level. Further variation of stocks in pairwise
study was found. Finally the UPGMA Cluster analysis the wild C. reba of four
different regions species showed stock differentiation of according to the endemic
regions though few overlapping were observed among Punarvaba, Bhramaputra and
Bergobindapur baor. The findings from the present study will help to broaden our
understanding of the growth patterns to compare life histories of the fish species among
different regions, to assess the condition of the fish, to determine biomass from
underwater length observation, to observe the body shape variation and to assess
possible differences between separate unit stocks of the same species. | en_US |
