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An analysis of the feasibility of using caudal vertebrae for ageing the spinetail devilray, Mobula japanica (Müller and Henle, 1841)

Cuevas Zimbrón, Elizabeth Maestra | Sosa Nishizaki, Óscar [autor/a] | Pérez Jiménez, Juan Carlos [autor/a] | O'Sullivan, John B [autor/a].
Tipo de material: Artículo ArtículoTema(s): Mobula japanica | Edad de los peces | Historia naturalDescriptor(es) geográficos: La Ventana, La Paz (Baja California Sur, México) Nota de acceso: Disponible para usuarios de ECOSUR con su clave de acceso En: Environmental Biology of Fishes. DOI: 10.1007/s10641-012-0086-2 (2012). --ISSN: 0378-1909Número de sistema: 39400Resumen:
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Age assessment of Mobula japanica may be possible using the caudal vertebrae, below the origin of the dorsal fin. This is supported by the significant linear relationship found between disc width (DW) and centrum radius (CR, n055), the continuous record of growth bands in the vertebrae, the clarity to distinguish and count growth bands, and the precision of the band counts. Assuming an annual band formation, the preliminary assessment of the age suggests that M. japanica lives at least 14 years and has a low growth rate (K00.28 year−1). The minimum number of growth bands was one for spinetail devilrays with a 1,210-1,390 mm DW, while the maximum was 14 for a 2,300 mm DW devilray. While age validation is still required, results indicate the feasibility of the use of caudal vertebrae for age estimation. To provide robust estimates of validated age and growth for the spinetail devilray, the sampling coverage needed might imply an international cooperation.
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Age assessment of Mobula japanica may be possible using the caudal vertebrae, below the origin of the dorsal fin. This is supported by the significant linear relationship found between disc width (DW) and centrum radius (CR, n055), the continuous record of growth bands in the vertebrae, the clarity to distinguish and count growth bands, and the precision of the band counts. Assuming an annual band formation, the preliminary assessment of the age suggests that M. japanica lives at least 14 years and has a low growth rate (K00.28 year−1). The minimum number of growth bands was one for spinetail devilrays with a 1,210-1,390 mm DW, while the maximum was 14 for a 2,300 mm DW devilray. While age validation is still required, results indicate the feasibility of the use of caudal vertebrae for age estimation. To provide robust estimates of validated age and growth for the spinetail devilray, the sampling coverage needed might imply an international cooperation. eng

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