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VALIDATION OF AGING TECHNIQUES AND GROWTH OF THE RIVER REDHORSE, MOXOSTOMA CARINATUM, IN THE JAMES RIVER, MISSOURI

Daniel W. Beckman and Christian A. Hutson
The Southwestern Naturalist
Vol. 57, No. 3 (SEPTEMBER 2012), pp. 240-247
Stable URL: http://www.jstor.org/stable/23258010
Page Count: 8
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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.
VALIDATION OF AGING TECHNIQUES AND GROWTH OF THE RIVER REDHORSE, MOXOSTOMA CARINATUM, IN THE JAMES RIVER, MISSOURI
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Abstract

We compared otoliths, opercles, and scales for precision and reliability for estimating age of the river redhorse Moxostoma carinatum in the James River, Missouri. Opercles and otoliths showed the greatest agreement, lowest variability, and most precision in comparisons of ages obtained from counts of annuli of scales. Scales tended to underestimate age relative to other structures. Analyses of edges of opercles and otoliths sampled monthly indicated formation of a single annulus concurrently in each structure in May—June. Opercles and otoliths, but not scales, were validated as reliable estimators of age in the river redhorse. Trajectories of growth from length-at-age data indicated a declining rate of growth with age, but continuous growth to a maximum age of 15 years. Fish of ages 3 and 4 years were 47% of the population. Comparamos otolitos, opérculos, y escamas para la precisión y la verosimilitud para estimar la edad del pez Moxostoma carinatum en el río James en el estado de Missouri. Opérculos y otolitos demostraron el acuerdo mayor, la variabilidad más baja, y la mejor precisión en comparaciones de las edades obtenidas de cuentas de anillos en las escamas. Las escamas tendieron a subestimar la edad, comparando con otras estructuras. Análisis de las orillas de opérculos y de otolitos muestreados mensualmente indicaron la formación de un sólo anillo concurrente en cada estructura en mayo—junio. Los opérculos y otolitos, pero no las escamas, fueron confirmados como indicadores confiables de la edad en este pez. Los trayectos del crecimiento basándose de datos de la longitud y edad indicaron una taza de crecimiento decreciente con la edad, pero crecimiento continuo a una edad máxima de 15 años. Los peces de edades 3 y 4 años constituyeron el 47% de la población.

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