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Reproductive characteristics of Aphanius isfahanensis, an Iranian endemic Cyprinodontid fish in the Zayandehrud River were examined. Samples were taken monthly, from June 2016 to May 2017. Some 485 specimens (245 females, 240 males) were caught by a hand net. Age of males and females ranged from 0+ to 2+ years. The largest female and male in total length and weight was 5.36 cm, 2.39 g and 4.49 cm,...