A total of 79 females of spirlin Alburnoides bipunctatus from the Rudava stream (small lowland stream, Western Slovakia) were examined to obtain data on fecundity and annual oocyte development cycle. Within spawning season (mid- April to early July), the reproduction resources seemed to be allocated in its former half more intensively (more yolked eggs present in ovaries compared to the rest of spawning season). For the mean SL = 76 mm and eviscerated body weight = 7.2 g, mean absolute fecundity of females in pre-spawning phase (n=13) was 3020 eggs (SD = 923; 2695 yolked eggs, SD = 1054), and mean relative fecundity 430 eggs/g (SD = 81; 373 yolked eggs, SD = 100). Number of eggs in the right and the left ovary differed significantly in 63.3 % of females, with a maximum difference of 1405 eggs. Two clues, namely 1) no gap in distribution between immature, unyolked oocytes (present in an ovary throughout the whole year), and yolked (vitellogenic) oocytes, 2) no increase in mean diameter of yolked oocytes towards the end of spawning season, suggest that spirlin is a species with indeterminate fecundity.