Thesis Title

Age, Growth, Reproduction and Population Structure of the Striped Shiner (Luxilus Chrysocephalus) and Duskystripe Shiner (Luxilus Pilsbryi) in the James River, Missouri

Date of Graduation

Summer 1999

Degree

Master of Science in Biology

Department

Biology

Committee Chair

Daniel Beckman

Subject Categories

Biology

Abstract

Four possible age estimators of river redhorse, otoliths, opercles, scales, and fin rays, were compared for accuracy, precision, and reliability. Validation of annulus formation, using marginal increment analysis, indicated that opercles and otoliths form an annulus from late May to late June. Opercle and otolith age estimates had the highest percent agreement, lowest variability, and the greatest precision. Opercles and otoliths but not scales or fin rays, were validated as reliable estimators of age in river redhorse. The 250 fish sampled contained age-classes 1-15 with an approximate age-at-maturity of 5 years. Age-class frequency distributions indicated that mortality increased substantially after maturity.

Copyright

© Bryan Raydon Simmons

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Dissertation/Thesis

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