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Validation of growth increments in stylets, beaks and lenses as ageing tools in Octopus maya

Rodríguez Domínguez, Almendra | Rosas Correa, Carmen Olivia [autor/a] | Méndez Loeza, Iván [coaur.] | Markaida Aburto, Unai [autor/a].
Tipo de material: Artículo en línea Artículo en línea Tema(s): Octopus maya | Pulpos | Edad | Población animal | Administración de la industria pesqueraTema(s) en inglés: Octopus maya | Octopuses | Age | Animal populations | Fishery managementNota de acceso: Acceso en línea sin restricciones En: Journal of Experimental Marine Biology and Ecology. volumen 449 (November 2013), páginas 194-199. --ISSN: 0022-0981Número de sistema: 53148Resumen:
Inglés

Octopus hard structures have recently been used as ageing tools. Thirty-two Octopus maya were raised in captivity in four age groups, ranging from 124 to 233 days old. Their stylets, beaks and eye lenses were analyzed in order to validate the periodicity of growth increments during all the octopus life. Transverse sections of stylets were mounted in glycerin jelly, beaks were sagitally cut to analyze their lateral walls and eye lenses were processed by histological techniques andmounted in resin. Growth increments in each structurewere observed and counted under a microscope. Stylet increments were successfully validated as their counts were closely related to age in days. Beak increments from the two younger age groups showed a close relationship with age, suggesting a daily deposition. However, persistence of lower increment counts strongly suggests that not all growth increments could be counted, probably due to erosion during feeding. Eye lens increment counts did not show a relation with age, although periodicity, if any, might be subdaily. The use of stylets is recommended for O. maya growth and ageing studies as they also showed a high precision in increment counts between readers.

Recurso en línea: http://www.researchgate.net/publication/258277723_Validation_of_growth_increments_in_stylets_beaks_and_lenses_as_ageing_tools_in_Octopus_maya/file/50463527c1a203214f.pdf
Lista(s) en las que aparece este ítem: Cefalopodos del Golfo de México
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Acceso en línea sin restricciones

Octopus hard structures have recently been used as ageing tools. Thirty-two Octopus maya were raised in captivity in four age groups, ranging from 124 to 233 days old. Their stylets, beaks and eye lenses were analyzed in order to validate the periodicity of growth increments during all the octopus life. Transverse sections of stylets were mounted in glycerin jelly, beaks were sagitally cut to analyze their lateral walls and eye lenses were processed by histological techniques andmounted in resin. Growth increments in each structurewere observed and counted under a microscope. Stylet increments were successfully validated as their counts were closely related to age in days. Beak increments from the two younger age groups showed a close relationship with age, suggesting a daily deposition. However, persistence of lower increment counts strongly suggests that not all growth increments could be counted, probably due to erosion during feeding. Eye lens increment counts did not show a relation with age, although periodicity, if any, might be subdaily. The use of stylets is recommended for O. maya growth and ageing studies as they also showed a high precision in increment counts between readers. eng

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