Precision of Ages Determined from Scales and Opercles for Yellow Perch Perca flavescens |
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| Affiliation: | 1. MS Research Center, Neuroscience Institute, Tehran University of Medical Sciences, Sina Hospital Hassan Abad Square, Tehran 1136746911, Iran;2. Department of Neurology, Louisiana State University Health Sciences Center - Shreveport, 1501 Kings Highway, Shreveport, LA 71130, USA;1. Ecología Funcional de Sistemas Acuáticos, Centro Universitario Regional del Este, Universidad de la República, Ruta nacional n° 15, km 28.5, CP 27000, Rocha, Uruguay;2. Sección Oceanografía y Ecología Marina, Facultad de Ciencias, Universidad de la República, Iguá 4225, CP 11400 Montevideo, Uruguay;3. Laboratorio de Físicoquímica Biológica, Facultad de Ciencias, Universidad de la República, Iguá 4225, CP 11400 Montevideo, Uruguay;1. University of Minnesota Duluth, 1035 Kirby Drive, Swenson Science Building, Duluth, MN 55812, United States;2. US Environmental Protection Agency Great Lakes Toxicology and Ecology Division, 6201 Congdon Blvd., Duluth, MN 55804, United States;1. Laboratory of Theoretical Chemistry, Department of Chemistry, University of Maragheh, P.O. Box 5513864596, Maragheh, Iran;2. Department of Chemistry, Faculty of Sciences, Arak University, Arak 38156-8-8349, Iran |
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| Abstract: | Scales and opercles were used to age yellow perch Perca flavescens collected in 1989 from Lake Madison (South Dakota), Dauphin Lake (Manitoba), and southern Lake Michigan (Indiana). Three readers aged fish from Lake Madison and Dauphin Lake once and two readers aged fish from Lake Michigan twice. The coefficient of variation (CV) was calculated to compare precision. Ages determined from opercles were as precise as those from scales for fish from Lake Madison (CV = 0 for both structures), and more precise than ages from scales for fish from Dauphin Lake (CVopercle = 14.0, CVscale = 27.4, p < 0.001) and Lake Michigan (CV opercle = 10.6, CVscale = 13.9, p < 0.001). The high precision of scale and opercle ages for yellow perch from Lake Madison can be attributed to the fast growth rate of fish from that lake and also that only age 1 and 2 fish were aged. The greater precision of opercle ages in comparison to scale ages for Dauphin Lake and Lake Michigan yellow perch can be attributed to ease of recognition of false annuli on opercles as well as to difficulty in distinguishing between false and true annuli crowded on the edge of scales from mature, slower growing fish. Because true annuli are more easily recognized on opercles, ages determined from opercles may be more accurate than ages determined from scales for yellow perch growing at slow or moderate rates. |
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