The age and growth of an Asturian population of the ‘bib’ Trisopterus luscus L. were studied based on 990 bibs from monthly catches from October 1986 until October 1988. Using the estimates of age taken from otolith readings, it was possible to construct a growth curve for the whole range of ages and demonstrate that most growth takes place during the first two years of life. The maximum age was found to be 5 years. The largest fish caught during the investigation measured 430 mm in standard length. The different growth rates of males and females show that in most cases the mean standard length of females was equal to or greater than that of the males.