Abstract
The purpose of research is determining the terms of spawning, age and morphometric characteristics of sires and rearing stocks of pikeperch ( Sander lucioperca ) gathered in one of the inlets of the Kapchagai water reservoir in 2012-2014. There were measured the mass, overall and commercial length, thickness and height of the body, head length, height of caudal paduncle, maximum body circumference. Fatness was determined, according to Fulton. To determine age there was used fish-scale. Reliability assessment of distinctions in dimensions was carried out by means of biological statistics. The terms of beginning (11-15 April) and end (20-22 April) of pikeperch spawning have been determined. The age of sires at catch is 5-9 years. There has been revealed the absence of essential dimensional distinctions in male and female pikeperch species; however, there were found distinctions in the side groups. Size indexes values of pikeperch sires from the investigated region of the Kapchagai water reservoir demonstrate polymorphism of pikeperch sires. The data obtained allow to plan rearing pikeperch juveniles breeding at all stages of production process.
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