Abstract
The annual fluctuations in the average length of the catches of A. immaculata , from the Bulgarian sector of the Danube River were studied. Between the years of 1962 and 2010 the average length varies within 23.7 cm and 26.3 cm, while in 2011, there was a significant drop in the average fish length (20.1 cm). The fecundity of the Pontic shad declines with increasing the linear and weight temp of growth. The condition factor was calculated by the coefficient of Fulton (K f ) using the total and gutted weight. The value of K f , calculated using the gutted weight of the individuals is 1. For males and females, the values of K f are respectively 1.05 and 1.07. Condition factor was also studied for each age group separately, for males and females and combined for both sexes.
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