Morphological Observation and Length-weight Relationship of Critically Endangered Riverine Catfish Rita rita (Hamilton)
The experiment was conducted to investigate the morphological
status of the critically endangered riverine catfish Rita rita using
morphometric and meristic traits. About 158 species of Rita were collected from
the old Brahmaputra river in Mymensingh district and were studied in the laboratory
of the Fisheries Biology and Genetics Department, Bangladesh Agricultural University.
Measurement of length and weight of Rita were recorded by using measuring scale
and electric balance respectively. Significant curvilinear relationship existed
between total length and other morphometric characters and between head length
and other characters of the head. Relationships between total length and various
body measurements of the fish were highly significant (p<0.01) except the
relationship between total length and pelvic fin length of male fish (p<0.05).
In case of meristic characters-dorsal fin rays, pelvic fin rays, pectoral fin
rays, anal fin rays, caudal fin rays, number of vertebrae and branchiostegal
rays were found to be more or less similar except slight differences. The values
of condition factors (k) in the total length body-weight relationships for female
and male were found to be 0.41 and 0.38, respectively. The mean values of relative
condition factors (kn) were 1.0 and 1.005 for female and male, respectively.
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