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Aspects of the Life History of the Slender Madtom Noturus exilis in Northeastern Oklahoma (Pisces: Ictaluridae)

Stephen P. Vives
The American Midland Naturalist
Vol. 117, No. 1 (Jan., 1987), pp. 167-176
DOI: 10.2307/2425717
Stable URL: http://www.jstor.org/stable/2425717
Page Count: 10
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Aspects of the Life History of the Slender Madtom Noturus exilis in Northeastern Oklahoma (Pisces: Ictaluridae)
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Abstract

The ictalurid, Noturus exilis, was studied from 13 February 1981 to 23 May 1982 in Flint and Cloud creeks in northeastern Oklahoma. Current speed, depth and substrate type in areas occupied by N. exilis were compared with frequency distributions of habitat availability. Noturus exilis were selective in their choice of current speed and substrate type; however, depths were used in the same proportion they were available. Slender madtoms in Flint Creek consumed ephemeropteran naiads and dipteran larvae most frequently by number (57.8% and 25.9%, respectively) and these organisms also occurred in proportionally more stomachs (66.1% and 57.6%, respectively). Compared with N. exilis in Green Creek, Illinois (studied by R.L. Mayden and B.M. Burr): (1) Flint Creek N. exilis were smaller at a given age; (2) Flint and Cloud creek N. exilis had a higher percentage of females that were mature in their 1st summer of life (age 0 +); (3) Flint and Cloud creek N. exilis had significantly fewer ova per gram adjusted body weight, and (4) Cloud Creek N. exilis had significantly larger ova and Flint Creek N. exilis nearly so.

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