Abstract
For the first time for water bodies of Belarus, based on studies (2008–2015), the main fertility parameters for eight alien species of amphipods were established . The minimum sizes of individuals for which identification of sex and the size of sexual maturation is possible are presented. The ranges of the body length of the egg-bearing females and the average sizes of the breeding individuals were determinate. The sizes and number of eggs are given at three stages of development for females of different age groups. Absolute and relative fertility were revealed. It is established that the number of eggs in the brood bag correlates with the size and weight of the female; the dependences of fecundity on the length and weight of the female were calculated. The theoretical possible number of litters in the period of reproduction of animals in the conditions of the obtained range was determined. The obtained results differed insignificantly with the literature data from regions with similar climatic conditions, that was determined mainly by various ecological conditions.
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