Validity of age determination and weight-linear structure of peled of the Bratsk Reservoir
To assess the validity of age identification the annual growth of scales of peled fish Coregonus peled (Gmelin), which was introduced into the man-made Bratsk water reservoir in East Siberia through agricultural projects launched in 2009, 2011 and 2012 was studied. The pattern of scale changes occurring due to seasonal rhythms was specified using light microscopy. The age features of the annual zone formation were described for fish samples aged 1+, 2+ and 4+, respectively. Besides, additional annuli on the scale of the samples, as well as revealed possible reasons for their existence were marked. The growth rate of peled fish introduced and growing in the Bratsk reservoir environment was found to be significantly higher than that of the populations in their natural habitat.