Abundances and biological traits of trout (salmo trutta) and salmon (salmo salar) sampled by electrofishing (except specific abundance indices) from 1985 to 2005 on the Nivelle (France).

From 1988 to 2005, an annual campaign was conducted to quantify by electrofishing the abundance of fishes in the Nivelle basin. It was usually done in September and October. The data consists of 1228 electrofishing operations and 22035 fish records (trout and salmon). Biological traits measured on the fish sampled are sex, maturity status, length, weight and age. Scale sampling is carried out on a subsample of individuals to estimate the age of the fish. The survey is carried out under the Research Observatory on Diadromous Fish in Coastal Streams (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 these heritage species