Abundances and biological traits of the juveniles trout sampled in the survey of trout abundance Indice on the Scorff river and its tributaries (France)

A survey started in 2007 is conducted every year in early autumn (late August to early September) to quantify the abundance of juvenile trout in the Scorff river in Brittany. The electric fishing protocol VIGITRUITE® is used. It targets trout young of the year (0+), but older fish (juvenile ≥1+) are also caught and included in this dataset. The data consist of abundance indices and biological traits measured on the fish sampled: sex, length, weight and age. The latter is ascertained from scale samples taken from the fish which size does not allow to determine their age unambiguously. The survey is carried out under the Research Observatory on Diadromes Fishes in Coastal Streamss (ERO DiaPFC) program. The data are stored in the database of the ERO. They are used to develop predictive models and tools for providing scientific advice to improve the management of this heritage species.