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1 October 2015 Seasonal Variation in Reproductive Condition of the Pecos Bluntnose Shiner (Notropis simus pecosensis)
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Abstract

Reproductive strategies vary among freshwater fishes. Information on reproductive characteristics is important for water managers' efforts to protect and recover imperiled species. We describe aspects of the reproductive ecology of Pecos Bluntnose Shiner (Notropis simus pecosensis). We determined gonadosomatic index, examined ovarian condition, and counted mature ova to determine the seasonal reproductive timing and duration of Pecos Bluntnose Shiner in the Pecos River, New Mexico. Monthly changes in gonadosomatic index, ovarian stage, and number of mature ova per female suggest that Pecos Bluntnose Shiner has a reproductive season extending from April through September, with a peak occurring in June and July. In July, 93% (n = 44) of female Pecos Bluntnose Shiner were in reproductive condition, regardless of size. The highest number of mature ova counted (1498) was observed in a 59.5-mm (standard length) female from June 2009. Peak spawning activity coincides with sustained water releases from reservoirs; these releases have higher peaks and longer duration than natural rainfall events. Results of this study provide important insight on the reproductive biology of a threatened fish and may be useful in long-term conservation planning.

© 2015
Thomas P. Archdeacon, Sara D. Blocker, Stephen R. Davenport, and Kjetil R. Henderson "Seasonal Variation in Reproductive Condition of the Pecos Bluntnose Shiner (Notropis simus pecosensis)," Western North American Naturalist 75(3), 271-280, (1 October 2015). https://doi.org/10.3398/064.075.0304
Received: 13 January 2015; Accepted: 1 June 2015; Published: 1 October 2015
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