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Life History Attributes of White Sucker (Catostomus commersoni) in Lake Taneycomo and Associated Tributaries in Southwestern Missouri

Carl K. Wakefield and Daniel W. Beckman
The Southwestern Naturalist
Vol. 50, No. 4 (Dec., 2005), pp. 423-434
Stable URL: http://www.jstor.org/stable/3672291
Page Count: 12
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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.
Life History Attributes of White Sucker (Catostomus commersoni) in Lake Taneycomo and Associated Tributaries in Southwestern Missouri
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Abstract

Spawning season of the white sucker (Catostomus commersoni) in tributaries of Lake Taneycomo, a coldwater reservoir of the White River system in southwestern Missouri, lasted from early April to late May in 1994 and 1995. Collection of fish larvae and spawning activities of adult white sucker indicated that spawning occurred in all tributaries of the lake. We did not observe evidence of spawning in the lake. White suckers began to mature at age 3 and a total length of 275 mm. A larger proportion of males matured at an earlier age and length, but females lived longer and reached larger sizes. Mortality rates were higher for mature males than females. Both sexes exhibited high mortality after age 8. Females were more abundant than males (1.94 to 6.50:1 F:M) in the upper lake throughout the year, while males were more abundant in Bull Creek (0.27 to 0.30:1 F:M), a major tributary, during the spawning season. Fecundity increased with fish size, ranging from approximately 5,000 to 59,000 eggs. Growth of white sucker continued throughout life, but slowed dramatically after maturation. Although this southern population in the Lake Taneycomo system spawned earlier than reported for most northern populations, its demographic attributes (age and length at maturity, fecundity, gonadosomatic index, fecundity, condition, and growth rates) were within ranges reported for other white sucker populations. /// La temporada de desove del matalote (Catostomus commersoni) en aguas tributarias del Lago Taneycomo, un embalse de agua fría del sistema del White River en el suroeste de Missouri, duró desde principios de abril a fines de mayo en 1994 y 1995. La recolecta de larvas y las actividades reproductivas del matalote adulto indicaron que el desove ocurrió en todas las tributarias del lago. No observamos evidencia del desove en el lago. Los matalotes comenzaron a madurar a los 3 años y con una longitud total de 275 mm. Una proporción mayor de machos maduró a una edad más joven y con una longitud menor, pero las hembras vivieron más tiempo y alcanzaron un tamaño mayor. La tasa de mortandad de los machos adultos fue mayor que la de las hembras adultas. Ambos sexos mostraron una tasa de mortandad más alta luego de cumplir 8 años. Las hembras fueron más abundantes que los machos (1.94 a 6.50:1 H:M) en la parte superior del lago a través del año, mientras que los machos fueron más abundantes en Bull Creek (0.27 a 0.30:1 H:M), una tributaria mayor, durante la temporada de desove. La fecundidad incrementó con el tamaño del pez, variando entre aproximadamente 5,000 a 59,000 huevos. El crecimiento del matalote continuó a través de su vida, pero aminoró dramáticamente luego de su maduración. A pesar de que esta población en el Lago Taneycomo desovó más temprano que lo reportado en la mayoría de las poblaciones en el norte, sus atributos demográficos (edad y longitud al madurar, fecundidad, índice gonadosomática, condición, y tasas de crecimiento) estuvieron dentro de los parámetros reportados de otras poblaciones de matalotes.

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