[ES] La estructura poblacional y condición reproductiva del isópodo neustónico Idotea metallica han sido estudiadas en junio 1993 durante una campaña de plancton realizada en el Mediterráneo occidental. El sexo de los individuos empieza a ser reconocible a partir de una talla de alrededor de 4 mm de longitud total. La estructura de tallas de la población es polimodal tanto en machos como en hembras. Se encontraron hembras ovígeras en tallas superiores a 13 mm y se estimó una talla media de madurez sexual de 14.9 mm. El número de huevos transportados osciló entre 30 y 182 por hembra y estuvo correlacionado positivamente con la talla de la hembra

[EN] The population structure and reproductive condition of the neustonic isopod Idotea metallica was determined from samples collected in June 1993 during a plankton cruise off the Catalan coast (western Mediterranean). Sexes were distinguishable from a size of around 4 mm total length. Both male and female size population structure were found to be polymodal. Ovigerous females were found at sizes larger than 13 mm and a mean size at sexual maturity of 14.9 mm was estimated. Brood size varied between 30 and 182 embryos per female and was positively correlated with female size

This piece of research was partially supported by CICYT research programs MAR91-0860 and AMB93-0728

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