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[EN] A standardisation of daily age determination in juveniles for this species is proposed by examining a wide\udrange in length of juveniles. Sagitta otoliths and the saggital plane were selected for the analysis and daily increments were\udread in the postrostrum and antirostrum axes. Certain regions of the otolith show wide, rhythmic double growth patterns.\udThese 2 axes were read with two different objectives (x10 and x20) and using two different interpretation criteria: group\udband reading (GBR), by which a repetitive cyclic set of growth bands were taken as single daily increments and individual\udmark reading (IMR), by which each microincrement, regardless of its appearance, constituted a daily count. Hatching dates,\udrelative error and coefficient of variation were applied in order to find the most consistent reading method, and were compared\udwith known growth rates in this and other genera of anchovy. Though the hatching dates produced by the two ageing\udmethods are compatible with the spawning period, we consider the GBR method to be the most reliable ageing procedure\udbecause: a) it is the most precise and robust (not being affected by the examination procedure); b) it allows the rhythmic\udpattern of alternating growth bands to be interpreted as sub-daily microincrements generated in the later phases of larvae\udand during metamorphosis; and c) it produces high rates of growth compatible with larva growth increments and with other\udstudies for the same genus at similar temperatures.[ES] Se propone una metodología con el fin de estandarizar la lectura de los incrementos diarios en juveniles de anchoa\udeuropea (Engraulis encrasicolus) basada en el procesado de un amplio rango de otolitos. Para ello se eligieron los otolitos\udsaggita y su plano saggital, que se leyeron por dos ejes y con dos aumentos. Algunas zonas de los otolitos mostraron patrones\udde crecimiento rítmicos con apariencia de dobles incrementos muy evidentes. Se usaron dos criterios de interpretación:\udLecturas por Bandas (GBR), donde cada ciclo repetitivo de grupos de incrementos son leídos como un solo incremento y\udLecturas Individuales (IMR) por la que cada incremento, independientemente de su apariencia, constituye un incremento. Se\udaplicaron Errores Relativos y Coeficientes de Variación buscando el método más consistente y se compararon las tasas de\udcrecimiento con otras anchoas del mismo género así como las fechas de nacimiento. A pesar de que estas fechas resultaron\udcompatibles con la época de puesta por los dos métodos, consideramos que el GBR es el método mas adecuado ya que: a)\udes el mas preciso y robusto b) permite interpretar el patrón de crecimiento rítmico encontrado, con alternancia de bandas\udcomo incrementos sub-diarios generados en las fases tempranas y durante la metamorfosis y c) justifica unas tasas altas\udde crecimiento compatibles con los incrementos larvarios en consonancia con estudios anteriores en este y otros géneros a\udsimilares temperaturas.This paper is\udcontribution nº 410 from AZTI-Tecnalia (Marine\udResearch).Peer reviewe

Establecimiento de un criterio de interpretación para datar otolitos de juveniles de anchoa europea