of age estimates from different ageing structures in
Shahista Khan, M.
Afzal Khan*, Kaish Miyan and Faisal Ahmad Lone
Fishery Science and Aquaculture, Department of Zoology, Aligarh Muslim
University, Aligarh – 202 002, India
Author E-mail: email@example.com
10 October 2013
17 February 2014
09 April 2014
present study was undertaken with a view to compare the precision of age
readings obtained from different ageing structures of some important
freshwater teleosts viz., Hypophthalmichthys molitrix, Mastacembelus
armatus and Ompok pabda. Standard procedures were followed to
study the ageing structures. Based on the highest percent agreement and
lowest average percentage of error and coefficient of variation values,
precise age estimates were exhibited by opercular bones in H. molitrix
and vertebrae in the remaining two fish, M. armatus and O. pabda.
When precise age estimates were compared among the age estimates of other
ageing structures, highest percent agreement and lowest average percent error
and coefficient of variation values were exhibited by vertebrae (versus
opercular bones) in H. molitrix and opercular bones (versus vertebrae)
in both M. armatus and O. pabda. When mean age estimates from
different ageing structures were compared, vertebrae and opercular bones
exhibited comparable values in H. molitrix. In M. armatus, mean values
of precise age estimates from vertebrae were significantly different from the
values of other ageing structures. However, in O. pabda, vertebrae as
well as opercular bones showed insignificantly different age readings.
precision, Opercular bones, Otoliths, Pectoral spines, Scales
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