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vol-7POPULATION CHARACTERISTICS “OF BAGRUSBAYAD
IN THE NOZHA-HYDRODROME DURING 1968-70.
ABSTRACT
During two fishing periods (1968-69 &. 1969-70), 6135 fish
of Bagrus bayad from the Nozha hydrodrorne were studied. The
analysis of length frequency and age composition of the catch revealed the presence of annual fluctuation in the strength of different
year-classes. The most obvious was the high abundance of 1967
y.(lU~-classand the scarcity of 1966 year-class. ”
The length-weight relationship, as well as the condition (actor
of B. bayad showed marked differences according to size and sex.
The adult fish is more robust than the small immature ones. The
weight, as well as the conditio~ factor for males are less than that
for females of corresponding lengths. Seasonal variation in the
condition factor also exist, with minimum values in the winter
months.
