Abstract
European bitterling age and growth were examined in 2017, 2018, and 2019 in the Uday and Perevod rivers in Pyriatynsky National Park (Poltava region, Ukraine). The population was represented by five age groups (0+ to 4+); specimen age was determined by counting annuli on scales. The annuli were visible and often displayed as irregularities in circuli in the centrolateral part of the scales. Standard specimen length varied from 14 to 51 mm; weight varied from 0.09 to 2.5 g. The length-weight relationship was W = 0.00005*TL2.78; W♂ = 0.00048*TL2.18; W♀ = 0.00028*TL2.32 for both sexes, males and females, respectively. The sex ratio was 1:1.26. The most abundant group in the samples from the Uday were young-of-the-years, and 1+ fish in the samples from the Perevod. As for mature specimens, 3+ fish predominated in both samples. The fastest relative growth was during the second year of life.
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