Abstract
The reproductive cycle of the big eye shiner {Notropis boops) in Brier Creek, S-central Oklahoma, is described for 1976 and 1977. Reproduction occurred from late April into August. The breeding season was longer and began earlier in the year than those of northern populations of the species. Ovarian regression began earlier in the 1977 breeding season than in 1976; this coincided with higher summer temperatures and more extreme drought conditions in 1977. Most individuals spawn during their 2nd summer of life with only a few surviving to spawn the following season. None spawn in their year of birth. Egg diameter frequencies suggest that individuals spawn more than one clutch per season. Compared to Notropis lutrensis and N. venustus, synoptic congeners of more southern origins, N. boops seemed more sensitive to stressful drought conditions of 1977.
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